^[1]

6,079

9,885

^[2]

7,716

Diluted Earnings Per Share

$ 30,268

$ 25,014

$ 24,348

Basic Earnings Per Share

$ 2.06

$ 1.70

$ 1.65

$ 2.03

$ 1.68

$ 1.63

[1]	Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.
[2]	Includes one-time, non-cash TCJA charge of $1,824,000

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Comprehensive income:
Net income	$ 30,268	$ 25,014	$ 24,348
Other comprehensive (loss) income:
Net unrealized (loss) gain on securities available-for-sale	(7,534)	6,637	(10,644)
Tax effect	1,793	(2,465)	3,954
Reclassification adjustments for losses (gains) included in net income	42		(387)
Tax effect	(10)		144
FASB ASC 715 pension adjustment	341	(1,311)	(1,435)
Tax effect	(81)	487	531
Foreign currency translation adjustments	(103)	161	(42)
Total comprehensive income	$ 24,716	$ 28,523	$ 16,469

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities:
Net income	$ 30,268	$ 25,014	$ 24,348
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,238	11,341	9,429
Net losses (gains) on sales of securities	42		(387)
Stock-based compensation expense	3,006	2,339	1,959
Provision for loan losses			(1,500)
Deferred income tax (benefit) expense	(3,521)	3,997	319
Increase (decrease) in current income tax liability	3,746	(3,026)	357
Increase in pension liability	4,641	8,008	4,137
Decrease (increase) in accounts receivable	4,709	(4,656)	(4,070)
Other operating activities, net	(5,794)	(4,127)	597
Net cash provided by operating activities	48,335	38,890	35,189
Cash Flows From Investing Activities:
Proceeds from sales of securities available-for-sale	58,520		21,491
Proceeds from maturities of securities available-for-sale	38,116	44,156	43,524
Purchase of securities available-for-sale	(82,022)	(124,777)	(96,290)
Net increase in loans	(35,336)	(21,335)	(5,771)
(Increase) decrease in payments in excess of funding	(21,674)	(33,756)	179
Purchases of premises and equipment, net	(4,399)	(4,127)	(4,684)
Net cash used in investing activities	(46,795)	(139,839)	(41,551)
Cash Flows From Financing Activities:
Net increase in noninterest-bearing demand deposits	31,717	66,885	32,833
Net decrease in interest-bearing demand and savings deposits	(7,838)	(7,472)	(51,440)
Net increase (decrease) in time deposits	19,959	(3,286)	(5,916)
Net (decrease) increase in accounts and drafts payable	(19,595)	19,601	65,028
Cash dividends paid	(13,177)	(10,675)	(9,979)
Purchase of common shares for treasury	(8,838)	(2,270)	(9,215)
Other financing activities, net	(945)	(467)	(1,378)
Net cash provided by financing activities	1,283	62,316	19,933
Net increase (decrease) in cash and cash equivalents	2,823	(38,633)	13,571
Cash and cash equivalents at beginning of year	228,110	266,743	253,172
Cash and cash equivalents at end of year	230,933	228,110	266,743
Supplemental information:
Cash paid for interest	3,701	2,178	2,017
Cash paid for income taxes	$ 6,723	$ 7,677	$ 7,061

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands

Common Stock [Member]

Additional Paid-in Capital [Member]

Retained Earnings [Member]

Treasury Stock [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Total

Balance at Dec. 31, 2015

$ 5,966

$ 126,290

$ 103,994

$ (22,208)

$ (6,664)

$ 207,378

Issuance of common shares pursuant to stock-based compensation plan, net

24,348

Cash dividends

(9,979)

^[1]

(1,231)

566

(665)

Exercise of SARs

(1,364)

651

(713)

Stock-based compensation expense

1,959

Purchase of common shares

^[1]

(9,215)

Excess tax benefits associated with stock based compensation

2,801

Other comprehensive loss

(7,879)

Balance at Dec. 31, 2016

5,966

128,455

118,363

(30,206)

(14,543)

208,035

Issuance of common shares pursuant to stock-based compensation plan, net

25,014

Cash dividends

(10,675)

Stock dividend

558

75,108

(75,674)

(8)

^[1]

(821)

273

(548)

Exercise of SARs

(451)

142

(309)

Stock-based compensation expense

2,340

Purchase of common shares

^[1]

(2,270)

Other comprehensive loss

3,509

Other comprehensive income

reclassification for ASU 2018-02

2,286

(2,286)

Balance at Dec. 31, 2017

6,524

204,631

59,314

(32,061)

(13,320)

225,088

Issuance of common shares pursuant to stock-based compensation plan, net

30,268

Cash dividends

(13,177)

Stock dividend

1,229

(1,234)

(5)

^[1]

(991)

624

(367)

Exercise of SARs

(876)

301

(575)

Stock-based compensation expense

3,006

Purchase of common shares

^[1]

(8,838)

Other comprehensive loss

(5,552)

Balance at Dec. 31, 2018

$ 7,753

$ 205,770

$ 75,171

$ (39,974)

$ (18,872)

$ 229,848

[1]	Share and per share figures adjusted for the 20% stock dividend that was paid on December 14, 2018.

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends, per share	$ 0.89	$ 0.72	$ 0.68
Stock issued pursuant to stock-based compensation	33,039	29,378	47,779
Stock Issued During Period, Shares, Purchase of Assets	169,143	50,215	247,002

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 Summary of Significant Accounting Policies *Summary of Operations* Cass Information Systems, Inc. (the “Company”) provides payment and information services, which include processing and payment of transportation, energy, telecommunications and environmental invoices. These services include the acquisition and management of data, information delivery and financial exchange. The consolidated balance sheet captions, “Accounts and drafts payable” and “Payments in excess of funding,” represent the Company’s resulting financial position related to the payment services that are performed for customers. The Company also provides a full range of banking services to individual, corporate and institutional customers through Cass Commercial Bank (the “Bank”), its wholly owned bank subsidiary. *Basis of Presentation* The accounting and reporting policies of the Company and its subsidiaries conform to U.S. generally accepted accounting principles (“GAAP”). The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries after elimination of intercompany transactions. Certain amounts in the 2017 and 2016 consolidated financial statements have been reclassified to conform to the 2018 presentation. Such reclassifications have no effect on previously reported net income or shareholders’ equity. The Company issued a 20% stock dividend on December 14, 2018. The share and per share information have been restated unless indicated otherwise for all periods presented in the accompanying consolidated financial statements. *Use of Estimates* In preparing the consolidated financial statements, Company management is required to make estimates and assumptions which significantly affect the reported amounts in the consolidated financial statements. *Cash and Cash Equivalents* For purposes of the consolidated statements of cash flows, the Company considers cash and due from banks, interest-bearing deposits in other financial institutions, federal funds sold and other short-term investments as segregated in the accompanying consolidated balance sheets to be cash equivalents. *Investment in Debt Securities* The Company classifies its debt marketable securities as available-for-sale. Securities classified as available-for-sale are carried at fair value. Unrealized gains and losses, net of the related tax effect, are excluded from earnings and reported in accumulated other comprehensive income, a component of shareholders’ equity. A decline in the fair value of any available-for-sale security below cost that is deemed other than temporary results in a charge to earnings and the establishment of a new cost basis for the security. To determine whether impairment is other than temporary, the Company considers guidance provided in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 320 - Investments – Debt and Equity Securities. When determining whether a debt security is other-than-temporarily impaired, the Company assesses whether it has the intent to sell the security and whether it is more likely than not that the Company will be required to sell prior to recovery of the amortized cost basis. Evidence considered in this assessment includes the reasons for impairment, the severity and duration of the impairment, changes in value subsequent to year-end and forecasted performance of the investee. Premiums and discounts are amortized or accreted to interest income over the estimated lives of the securities using the level-yield method. Interest income is recognized when earned. Gains and losses are calculated using the specific identification method. *Allowance for Loan Losses (“ALLL”)* The ALLL is increased by provisions charged to expense and is available to absorb charge-offs, net of recoveries. Management utilizes a systematic, documented approach in determining the appropriate level of the ALLL. Management’s approach provides for estimated credit losses on individually evaluated loans in accordance with FASB ASC 310 - Allowance for Credit Losses (“ASC 310”). These estimates are based upon a number of factors, such as payment history, financial condition of the borrower, expected future cash flows and discounted collateral exposure. Estimated credit losses inherent in the remainder of the portfolio are estimated in accordance with FASB ASC 450 - Contingencies. These loans are segmented into groups based on similar risk characteristics. Historical loss rates for each risk group, which are updated quarterly, are generally quantified using all recorded loan charge-offs and recoveries over a prescribed look-back period. These historical loss rates for each risk group are used as the starting point to determine the level of the allowance. The Company’s methodology incorporates an estimated loss emergence period for each risk group. The loss emergence period is the period of time from when a borrower experiences a loss event and when the actual loss is recognized in the financial statements, generally at the time of initial charge-off of the loan balance. The Company’s methodology also includes qualitative risk factors that allow management to adjust its estimates of losses based on the most recent information available and to address other limitations in the quantitative component that is based on historical loss rates. Such risk factors are generally reviewed and updated quarterly, as appropriate, and are adjusted to reflect changes in national and local economic conditions and developments, the volume and severity of delinquent and internally classified loans, loan concentrations, assessment of trends in collateral values, assessment of changes in borrowers’ financial stability, and changes in lending policies and procedures, including underwriting standards and collections, charge-off and recovery practices. Management believes the ALLL is adequate to absorb probable losses in the loan portfolio. Additionally, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s ALLL. Such agencies may require the Company to increase the ALLL based on their judgments and interpretations about information available to them at the time of their examinations. *Premises and Equipment* Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed over the estimated useful lives of the assets, or the respective lease terms for leasehold improvements, using straight-line and accelerated methods. Estimated useful lives do not exceed 40 years for buildings, the lesser of 10 years or the life of the lease for leasehold improvements and range from 3 to 7 years for software, equipment, furniture and fixtures. Maintenance and repairs are charged to expense as incurred. *Intangible Assets* Cost in excess of fair value of net assets acquired has resulted from business acquisitions. Goodwill and intangible assets with indefinite useful lives are not amortized, but instead are tested for impairment at least annually. Intangible assets with definite useful lives are amortized on a straight-line basis over their respective estimated useful lives. Periodically, the Company reviews intangible assets for events or changes in circumstances that may indicate that the carrying amount of the assets may not be recoverable. Based on those reviews, adjustments of recorded amounts have not been required. *Non-marketable Equity Investments* The Company accounts for non-marketable equity investments, in which it holds less than a 20% ownership, under the cost method. Under the cost method of accounting, investments are carried at cost and are adjusted only for other than temporary declines in fair value, distributions of earnings and additional investments. The Company periodically evaluates whether any declines in fair value of its investments are other than temporary. In performing this evaluation, the Company considers various factors including any decline in market price, where available, the investee's financial condition, results of operations, operating trends and other financial ratios. Non-marketable equity investments are included in other assets on the consolidated balance sheets. *Foreclosed Assets* Real estate acquired as a result of foreclosure is initially recorded at fair value less estimated selling costs. Fair value is generally determined through the receipt of appraisals. Any write down to fair value at the time the property is acquired is recorded as a charge-off to the allowance for loan losses. Any decline in the fair value of the property subsequent to acquisition is recorded as a charge to non-interest expense. *Treasury Stock* Purchases of the Company’s common stock are recorded at cost. Upon reissuance, treasury stock is reduced based upon the average cost basis of shares held. *Comprehensive Income* Comprehensive income consists of net income, changes in net unrealized gains (losses) on available-for-sale securities and pension liability adjustments and is presented in the accompanying consolidated statements of shareholders' equity and consolidated statements of comprehensive income. *Loans* Interest on loans is recognized based upon the principal amounts outstanding. It is the Company’s policy to discontinue the accrual of interest when there is reasonable doubt as to the collectability of principal or interest. Subsequent payments received on such loans are applied to principal if there is any doubt as to the collectability of such principal; otherwise, these receipts are recorded as interest income. The accrual of interest on a loan is resumed when the loan is current as to payment of both principal and interest and/or the borrower demonstrates the ability to pay and remain current. Loan origination and commitment fees on originated loans, net of certain direct loan origination costs, are deferred and amortized to interest income using the level-yield method over the estimated lives of the related loans. *Impairment of Loans* A loan is considered impaired when it is probable that a creditor will be unable to collect all amounts due, both principal and interest, according to the contractual terms of the loan agreement. When measuring impairment, the expected future cash flows of an impaired loan are discounted at the loan's effective interest rate. Alternatively, impairment could be measured by reference to an observable market price, if one exists, or the fair value of the collateral for a collateral-dependent loan. Regardless of the historical measurement method used, the Company measures impairment based on the fair value of the collateral when the Company determines foreclosure is probable. Additionally, impairment of a restructured loan is measured by discounting the total expected future cash flows at the loan's effective rate of interest as stated in the original loan agreement. The Company uses its nonaccrual methods as discussed above for recognizing interest on impaired loans. *Information Services Revenue* A majority of the Company’s revenues are attributable to fees for providing services. These services include transportation invoice rating, payment processing, auditing, and the generation of accounting and transportation information. The Company also processes, pays and generates management information from electric, gas, telecommunications, environmental, and other invoices. The specific payment and information processing services provided to each customer are developed individually to meet each customer’s specific requirements. The Company enters into service agreements with customers typically for fixed fees per transaction that are invoiced monthly. Revenues are recognized in the period services are rendered and earned under the service agreements, as long as collection is reasonably assured. *Income Taxes* Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. Deferred tax assets are reduced if necessary, by a deferred tax asset valuation allowance. In the event that management determines it is more likely than not that it will not be able to realize all or part of net deferred tax assets in the future, the Company adjusts the recorded value of deferred tax assets, which would result in a direct charge to income tax expense in the period that such determination is made. Likewise, the Company will reverse the valuation allowance when realization of the deferred tax asset is expected. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company and its subsidiaries file U.S. federal and certain state income tax returns on a consolidated basis. In addition, certain state jurisdictions are filed on a separate company basis by the Company or its subsidiaries. The Company recognizes and measures income tax benefits using a two-step model: 1) a tax position must be more likely than not to be sustained based solely on its technical merits in order to be recognized; and 2) the benefit must be measured as the largest dollar amount of that position that is more likely than not to be sustained upon settlement. The difference between the benefit recognized for a tax position in this model and the tax benefit claimed on a tax return is treated as an unrecognized tax benefit. The Company recognizes income tax related interest and penalties in income tax expense. *Earnings Per Share* Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share is computed by dividing net income by the sum of the weighted average number of common shares outstanding and the weighted average number of potential common shares outstanding. *Stock-Based Compensation* The Company follows FASB ASC 718 - Accounting for Stock Options and Other Stock-based Compensation (“ASC 718”), which requires that all stock-based compensation be recognized as an expense in the financial statements and that such cost be measured at the fair value of the award. FASB ASC 718 also requires that excess tax benefits related to stock option exercises and restricted stock awards be reflected as financing cash inflows instead of operating cash inflows. *Pension Plans* The amounts recognized in the consolidated financial statements related to pension are determined from actuarial valuations. Inherent in these valuations are assumptions including expected return on plan assets, discount rates at which the liabilities could be settled at December 31, 2018, rate of increase in future compensation levels and mortality rates. These assumptions are updated annually and are disclosed in Note 10. The Company follows FASB ASC 715 - Compensation – Retirement Benefits (“ASC 715”), which requires companies to recognize the overfunded or underfunded status of a defined benefit postretirement plan as an asset or liability in its consolidated balance sheet and to recognize changes in that funded status in the year in which the changes occur through comprehensive income. The funded status is measured as the difference between the fair value of the plan assets and the projected benefit obligation as of the date of its fiscal year-end. *Fair Value Measurements* The Company follows the provisions of FASB ASC 820 - Fair Value Measurements and Disclosures, which defines fair value, establishes a framework for measuring fair value in GAAP, and outlines disclosures about fair value measurements. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A three-level hierarchy for valuation techniques is used to measure financial assets and financial liabilities at fair value. This hierarchy is based on whether the valuation inputs are observable or unobservable. Financial instrument valuations are considered Level 1 when they are based on quoted prices in active markets for identical assets or liabilities. Level 2 financial instrument valuations use quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. Financial instrument valuations are considered Level 3 when they are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable, and when determination of the fair value requires significant management judgment or estimation. The Company records securities available for sale at their fair values on a recurring basis using Level 2 valuations. Additionally, the Company records impaired loans and other real estate owned at their fair value on a nonrecurring basis. The nonrecurring fair value adjustments typically involve application of lower-of-cost-or-market accounting or impairment write-downs of individual assets. Impact of New and Not Yet Adopted Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09 – Revenue from Contracts with Customers. The ASU supersedes revenue recognition requirements in Topic 605, Revenue Recognition, including most industry-specific revenue recognition guidance in the FASB Accounting Standards Codification (“ASC”). The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance identifies specific steps that entities should apply in order to achieve this principle. Under the ASU, the amendments are effective for interim and annual periods beginning January 1, 2018 and must be applied retrospectively. On January 1, 2018, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with Customers (“FASB ASC 606”), and selected the modified retrospective transition method. The adoption of this new standard did not impact the Company’s results of operations or balance sheet and there was no cumulative effect of initially applying this new revenue standard to the opening balance of retained earnings. Since interest income on loans and securities are both excluded from this topic, a significant portion of the Company’s revenues are not subject to the new guidance. The services that fall within the scope of FASB ASC 606 are presented within fee revenue and other income in the Consolidated Statements of Income and are recognized as revenue as the obligation to the customer is satisfied. Services within the scope of FASB ASC 606 include invoice processing and payment fees, bank service fees, and other real estate owned (“OREO”). In February 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-02 – Leases (ASC Topic 842). The ASU improves financial reporting about leasing transactions. The ASU affects all companies and other organizations that lease assets such as real estate, airplanes, and manufacturing equipment. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP—which requires only capital leases to be recognized on the balance sheet—the new ASU will require both types of leases to be recognized on the balance sheet. The ASU also will require disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. The ASU on leases will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. A third-party vendor solution has been selected to assist in the application of ASU 2016-02. The Company will adopt this ASU using a prospective transition approach, which applies the provisions of the new guidance at the effective date without adjusting the comparative periods presented. The adoption of this ASU is expected to add assets and liabilities of approximately $9-11 million to the Company’s balance sheet. In June 2016, the FASB issued ASU No. 2016-13 - Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU requires measurement and recognition of expected credit losses for financial assets held. Under this standard, it will be required to hold an allowance equal to the expected life-of-loan losses on the loan portfolio. The standard is effective for fiscal periods beginning after December 15, 2019. The Company expects to recognize a one-time cumulative effect adjustment to the allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective, but cannot yet determine the magnitude of any such one-time adjustment or the overall impact of the new guidance on the consolidated financial statements.

Capital Requirements and Regulatory Restrictions

12 Months Ended

Dec. 31, 2018

Regulatory Capital Requirements [Abstract]

Capital Requirements and Regulatory Restrictions

Note 2
Capital Requirements and Regulatory Restrictions

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can result in certain mandatory, and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s consolidated financial statements. Under capital adequacy guidelines, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s and the Bank’s capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

Quantitative measures established by regulators to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of total and Tier I capital and common equity Tier I capital to risk-weighted assets, and of Tier I capital to average assets. Management believes that as of December 31, 2018 and 2017, the Company and the Bank met all capital adequacy requirements to which they are subject.

Effective July 2, 2013, the Federal Reserve Board approved final rules known as the “Basel III Capital Rules” that substantially revised the risk-based capital and leverage capital requirements applicable to bank holding companies and depository institutions, including the Company and the Bank. The Basel III Capital Rules implement aspects of the Basel III capital framework agreed upon by the Basel Committee and incorporate changes required by the Dodd-Frank Wall Street Reform and Consumer Protection Act. Among other things, the Basel III Capital Rules establish stricter capital requirements and calculation standards, as well as more restrictive risk weightings for certain loans and facilities. The Basel III Capital Rules were effective for the Company and the Bank on January 1, 2015, subject to a phase-in period that ended on December 31, 2018.

The Bank is also subject to the regulatory framework for prompt corrective action. As of December 31, 2018, the most recent notification from the regulatory agencies categorized the Bank as well-capitalized. To be categorized as well-capitalized, the Bank must maintain minimum total risk-based, common equity Tier I risk-based, Tier I risk-based, and Tier I leverage ratios as set forth in the table below. There are no conditions or events since that notification that management believes have changed the Bank’s category.

The Company has traditionally paid a quarterly cash dividend to its shareholders. Subsidiary dividends can be a significant source of funds for payment of dividends by the Company to its shareholders. Banking regulations may limit the amount of dividends that may be paid. Approval by regulatory authorities is required if the effect of dividends declared would cause the regulatory capital of the Bank to fall below specified minimum levels. Approval is also required if dividends declared exceed the net profits for that year combined with the retained net profits for the preceding two years. Under the foregoing dividend restrictions and while maintaining its “well capitalized” status, at December 31, 2018, unappropriated retained earnings of $37,150,000 were available at the Bank for the declaration of dividends to the Company without prior approval from regulatory authorities. In addition to regulatory requirements and considerations, any payment of dividends in the future will depend on the Company’s earnings, financial condition and other factors considered relevant by the Company’s Board of Directors.

There were no restricted funds on deposit used to meet regulatory reserve requirements at December 31, 2018 and 2017.

The Company’s and the Bank’s actual and required capital amounts and ratios are as follows:

					Capital				Requirement to be
	Actual				Requirements				Well-Capitalized
(In thousands)	Amount Ratio				Amount Ratio				Amount Ratio
At December 31, 2018
Total capital (to risk-weighted assets)
Cass Information Systems, Inc.	$	244,660	21.38	%	$	91,550	8.00	%	$	N/A	N/A	%
Cass Commercial Bank		137,894	18.31			60,257	8.00			75,321	10.00
Common Equity Tier I Capital (to risk-weighted assets)
Cass Information Systems, Inc.		234,435	20.49			51,497	4.50			N/A	N/A
Cass Commercial Bank		130,037	17.26			33,895	4.50			48,959	6.50
Tier I capital (to risk-weighted assets)
Cass Information Systems, Inc.		234,435	20.49			68,662	6.00			N/A	N/A
Cass Commercial Bank		130,037	17.26			45,193	6.00			60,257	8.00
Tier I capital (to average assets)
Cass Information Systems, Inc.		234,435	13.89			67,500	4.00			N/A	N/A
Cass Commercial Bank		130,037	15.35			33,884	4.00			42,354	5.00
At December 31, 2017
Total capital (to risk-weighted assets)
Cass Information Systems, Inc.	$	234,389	22.53	%	$	83,233	8.00	%	$	N/A	N/A	%
Cass Commercial Bank		122,440	17.01			57,568	8.00			71,960	10.00
Common Equity Tier I Capital (to risk-weighted assets)
Cass Information Systems, Inc.		224,184	21.55			46,819	4.50			N/A	N/A
Cass Commercial Bank		114,603	15.93			32,382	4.50			46,774	6.50
Tier I capital (to risk-weighted assets)
Cass Information Systems, Inc.		224,184	21.55			62,425	6.00			N/A	N/A
Cass Commercial Bank		114,603	15.93			43,176	6.00			57,568	8.00
Tier I capital (to average assets)
Cass Information Systems, Inc.		224,184	13.87			64,649	4.00			N/A	N/A
Cass Commercial Bank		114,603	14.99			30,581	4.00			38,227	5.00

Investments, Debt and Equity Securities [Abstract]

The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1C
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958572-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
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+ Details

Investment in Securities

12 Months Ended

Dec. 31, 2018

Investment in Securities

Note 3
Investment in Securities

Investment securities available-for-sale are recorded at fair value on a recurring basis. The Company’s investment securities available-for-sale at December 31, 2018 and 2017 are measured at fair value using Level 2 valuations. The market evaluation utilizes several sources which include “observable inputs” rather than “significant unobservable inputs” and therefore falls into the Level 2 category. The table below presents the balances of securities available-for-sale measured at fair value on a recurring basis. The amortized cost, gross unrealized gains, gross unrealized losses and fair value of debt and equity securities are summarized as follows:

	December 31, 2018
			Gross		Gross
	Amortized		Unrealized		Unrealized
(In thousands)	Cost		Gains		Losses		Fair Value
State and political subdivisions	$	332,732	$	3,791	$	1,806	$	334,717
U.S. government agencies		106,153		86		1,417		104,822
Certificates of deposit		1,995		—		—		1,995
Total	$	440,880	$	3,877	$	3,223	$	441,534

	December 31, 2017
			Gross		Gross
	Amortized		Unrealized		Unrealized
(In thousands)	Cost		Gains		Losses		Fair Value
State and political subdivisions	$	408,165	$	9,528	$	661	$	417,032
U.S. government agencies		46,222		—		722		45,500
Certificates of deposit		7,991		—		—		7,991
Total	$	462,378	$	9,528	$	1,383	$	470,523

The fair values of securities with unrealized losses are as follows:

	December 31, 2018
	Less than 12 months				12 months or more				Total
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
(In thousands)	Fair Value		Losses		Fair Value		Losses		Fair value		Losses
State and political subdivisions	$	91,248	$	556	$	60,546	$	1,250	$	151,794	$	1,806
U.S. government agencies		30,409		130		38,005		1,287		68,414		1,417
Certificates of deposit		—		—		—		—		—		—
Total	$	121,657	$	686	$	98,551	$	2,537	$	220,208	$	3,223

	December 31, 2017
	Less than 12 months				12 months or more				Total
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
(In thousands)	Fair Value		Losses		Fair Value		Losses		Fair value		Losses
State and political subdivisions	$	34,755	$	123	$	31,251	$	538	$	66,006	$	661
U.S. government agencies		34,183		376		11,317		346		45,500		722
Certificates of deposit		—		—		—		—		—		—
Total	$	68,938	$	499	$	42,568	$	884	$	111,506	$	1,383

There were 136 securities, or 43% of the total (61 greater than 12 months), in an unrealized loss position as of December 31, 2018 compared to 64 securities, or 17% (24 greater than 12 months), in an unrealized loss position as of December 31, 2017. All unrealized losses are reviewed to determine whether the losses are other than temporary. Management believes that all unrealized losses are temporary since they are market driven, the Company does not have the intent to sell the security, and it is more likely than not that the Company will not be required to sell prior to recovery of the amortized basis.

The amortized cost and fair value of debt and equity securities by contractual maturity are shown in the following table. Expected maturities may differ from contractual maturities because borrowers have the right to prepay obligations with or without prepayment penalties.

	December 31, 2018
(In thousands)	Amortized Cost		Fair Value
Due in 1 year or less	$	7,956	$	7,987
Due after 1 year through 5 years		125,746		126,252
Due after 5 years through 10 years		242,119		244,118
Due after 10 years		65,059		63,177
No stated maturity		—		—
Total	$	440,880	$	441,534

The premium related to the purchase of state and political subdivisions was $6,857,000 and $7,147,000 in 2018 and 2017, respectively.

The amortized cost of debt securities pledged to secure public deposits, securities sold under agreements to repurchase and for other purposes at December 31, 2018 was $0 and at December 31, 2017 was $3,750,000.

Proceeds from sales of debt securities classified as available-for-sale were $58,520,000 in 2018, $0 in 2017, and $21,491,000 in 2016. Gross realized gains on the sales in 2018, 2017 and 2016 were $180,000, $0, and $387,000, respectively. Gross realized losses on sales in 2018, 2017 and 2016 were $222,000, $0, and $0, respectively.

Loans

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Loans

Loans
Note 4

The Company originates commercial, industrial and real estate loans to businesses and faith-based ministries throughout the metropolitan St. Louis, Missouri area, Orange County, California, Colorado Springs, Colorado and other selected cities in the United States. The Company does not have any particular concentration of credit in any one economic sector; however, a substantial portion of the commercial and industrial loans is extended to privately-held commercial companies and franchises in these market areas and are generally secured by the assets of the business. The Company also has a substantial portion of real estate loans secured by mortgages that are extended to faith-based ministries in its market area and selected cities in the United States.

A summary of loan categories is as follows:

	December 31,
(In thousands)	2018		2017
Commercial and industrial	$	277,091	$	236,394
Real estate
Commercial:
Mortgage		95,605		94,675
Construction		11,858		9,359
Faith-based:
Mortgage		316,147		316,073
Construction		20,576		25,948
Industrial Revenue Bonds		—		3,374
Other		310		408
Total loans	$	721,587	$	686,231

The following table presents the aging of loans by loan categories at December 31, 2018:

	Performing						Nonperforming
							90 Days
			30-59		60-89		and		Non-		Total
(In thousands)	Current		Days		Days		Over		accrual		Loans
Commercial and industrial	$	277,091	$	—	$	—	$	—	$	—	$	277,091
Real estate
Commercial:
Mortgage		95,605		—		—		—		—		95,605
Construction		11,858		—		—		—		—		11,858
Faith-based:
Mortgage		316,147		—		—		—		—		316,147
Construction		20,576		—		—		—		—		20,576
Industrial Revenue Bonds		—		—		—		—		—		—
Other		310		—		—		—		—		310
Total	$	721,587	$	—	$	—	$	—	$	—	$	721,587

The following table presents the aging of loans by loan categories at December 31, 2017:

	Performing						Nonperforming
							90 Days
			30-59		60-89		and		Non-		Total
(In thousands)	Current		Days		Days		Over		accrual		Loans
Commercial and industrial	$	236,394	$	—	$	—	$	—	$	—	$	236,394
Real estate
Commercial:
Mortgage		94,675		—		—		—		—		94,675
Construction		9,359		—		—		—		—		9,359
Faith-based:
Mortgage		316,073		—		—		—		—		316,073
Construction		25,948		—		—		—		—		25,948
Industrial Revenue Bonds		3,374		—		—		—		—		3,374
Other		408		—		—		—		—		408
Total	$	686,231	$	—	$	—	$	—	$	—	$	686,231

The following table presents the credit exposure of the loan portfolio by internally assigned credit grade as of December 31, 2018:

	Loans		Performing		Nonperforming
	Subject to		Loans Subject to		Loans Subject
	Normal		Special		to Special
(In thousands)	Monitoring⁽¹⁾		Monitoring⁽²⁾		Monitoring⁽²⁾		Total Loans
Commercial and industrial	$	275,308	$	1,783	$	—	$	277,091
Real estate
Commercial:
Mortgage		95,447		158		—		95,605
Construction		11,858		—		—		11,858
Faith-based:
Mortgage		314,940		1,207		—		316,147
Construction		20,576		—		—		20,576
Industrial Revenue Bonds		—		—		—		—
Other		310		—		—		310
Total	$	718,439	$	3,148	$	—	$	721,587

⁽¹⁾	Loans subject to normal monitoring involve borrowers of acceptable-to-strong credit quality and risk, who have the apparent ability to satisfy their loan obligation.
⁽²⁾	Loans subject to special monitoring possess some credit deficiency or potential weakness which requires a high level of management attention.

The following table presents the credit exposure of the loan portfolio by internally assigned credit grade as of December 31, 2017:

	Loans		Performing		Nonperforming
	Subject to		Loans Subject to		Loans Subject
	Normal		Special		to Special
(In thousands)	Monitoring⁽¹⁾		Monitoring⁽²⁾		Monitoring⁽²⁾		Total Loans
Commercial and industrial	$	234,271	$	2,123	$	—	$	236,394
Real estate
Commercial:
Mortgage		93,788		887		—		94,675
Construction		9,359		—		—		9,359
Faith-based:
Mortgage		316,042		31		—		316,073
Construction		25,948		—		—		25,948
Industrial Revenue Bonds		3,374		—		—		3,374
Other		408		—		—		408
Total	$	683,190	$	3,041	$	—	$	686,231

⁽¹⁾	Loans subject to normal monitoring involve borrowers of acceptable-to-strong credit quality and risk, who have the apparent ability to satisfy their loan obligation.
⁽²⁾	Loans subject to special monitoring possess some credit deficiency or potential weakness which requires a high level of management attention.

Impaired loans consist primarily of nonaccrual loans, loans greater than 90 days past due and still accruing interest and troubled debt restructurings, both performing and non-performing. Troubled debt restructuring involves the granting of a concession to a borrower experiencing financial difficulty resulting in the modification of terms of the loan, such as changes in payment schedule or interest rate. There was no ALLL related to impaired loans at both December 31, 2018 and 2017. There were no non-accrual loans at December 31, 2018 and 2017. There were no loans delinquent 90 days or more and still accruing interest at both December 31, 2018 and 2017. At December 31, 2018 and 2017, there were no loans classified as troubled debt restructuring. The average balances of impaired loans during 2018, 2017 and 2016 were $0, $166,000, and $333,000, respectively. Income that would have been recognized on non-accrual loans under the original terms of the contract was $0, $24,000, and $66,000 for 2018, 2017 and 2016, respectively. Income that was recognized on nonaccrual loans was $0, $17,000, and $47,000 for 2018, 2017 and 2016 respectively. There were no foreclosed assets as of December 31, 2018 or 2017.

The Company does not record loans at fair value on a recurring basis. Once a loan is identified as impaired, management measures impairment in accordance with FASB ASC 310. At December 31, 2018 and 2017, there were no impaired loans. The fair value of the collateral is based upon an observable market price or current appraised value and therefore, the Company classifies these assets as nonrecurring Level 3.

A summary of the activity in the allowance for loan losses for the period ended December 31, 2018 is as follows:

	December 31,		Charge-							December 31,
(In thousands)	2017		Offs		Recoveries		Provision			2018
Commercial and industrial	$	3,652	$	—	$	20	$	507		$	4,179
Real estate
Commercial:
Mortgage		1,394		—		—		23			1,417
Construction		70		—		—		19			89
Faith-based:
Mortgage		3,962		—		—		(1	)		3,961
Construction		196		—		—		(41	)		155
Industrial Revenue Bond		52		—		—		(52	)		—
Other		879		—		—		(455	)		424
Total	$	10,205	$	—	$	20	$	—		$	10,225

A summary of the activity in the allowance for loan losses for the period ended December 31, 2017 is as follows:

	December 31,		Charge-							December 31,
(In thousands)	2016		Offs		Recoveries		Provision			2017
Commercial and industrial	$	3,261	$	—	$	30	$	361		$	3,652
Real estate
Commercial:
Mortgage		1,662		—		—		(268	)		1,394
Construction		47		—		—		23			70
Faith-based:
Mortgage		4,027		—		—		(65	)		3,962
Construction		85		—		—		111			196
Industrial Revenue Bond		101		—		—		(49	)		52
Other		992		—		—		(113	)		879
Total	$	10,175	$	—	$	30	$	—		$	10,205

As of December 31, 2018, there were loans totaling $278,153 to affiliates of executive officers or directors. There were no loans to affiliates of executive officers or directors at December 31, 2017.

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

Property, Plant and Equipment [Abstract]

Premises and Equipment

12 Months Ended

Dec. 31, 2018

Premises and Equipment

Note 5
Premises and Equipment

A summary of premises and equipment is as follows:

	December 31,
(In thousands)	2018		2017
Land	$	873	$	873
Buildings		14,684		13,386
Leasehold improvements		2,537		2,120
Furniture, fixtures and equipment		16,332		14,801
Purchased software		5,043		4,819
Internally developed software		17,428		16,485
		56,897		52,484
Less accumulated depreciation		34,866		30,898
Total	$	22,031	$	21,586

Total depreciation charged to expense in 2018, 2017 and 2016 amounted to $3,954,000, $3,624,000 and $3,245,000, respectively.

The Company and its subsidiaries lease various premises under operating lease agreements which expire at various dates through 2024. Rental expense for 2018, 2017 and 2016 was $1,648,000, $1,499,000 and $1,397,000, respectively. The following is a schedule, by year, of future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year as of December 31, 2018:

(In thousands)	Amount
2019		1,639
2020		1,902
2021		1,769
2022		1,646
2023		724
2024+		3,040
Total	$	10,720

Acquired Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Acquired Intangible Assets

Note 6
Acquired Intangible Assets

The Company accounts for intangible assets in accordance with FASB ASC 350 - Goodwill and Other Intangible Assets (“ASC 350”), which requires that intangibles with indefinite useful lives be tested annually for impairment and those with finite useful lives be amortized over their useful lives.

Details of the Company’s intangible assets are as follows:

	December 31, 2018					December 31, 2017
	Gross Carrying		Accumulated			Gross Carrying		Accumulated
(In thousands)	Amount		Amortization			Amount		Amortization
Assets eligible for amortization:
Customer lists	$	4,288	$	(3,071	)	$	4,288	$	(2,702	)
Patent		72		(16	)		72		(12	)
Non-compete agreements		332		(326	)		332		(291	)
Software		234		(234	)		234		(234	)
Other		500		(225	)		500		(191	)
Unamortized intangible assets:
Goodwill ⁽¹⁾		12,796		(227	)		12,796		(227	)
Total intangible assets	$	18,222	$	(4,099	)	$	18,222	$	(3,657	)

⁽¹⁾

Amortization through December 31, 2001 prior to adoption of FASB ASC 350.

The customer lists are amortized over seven and ten years; the patents over 18 years, the non-compete agreements over two and five years, software over three years and other intangible assets over 15 years. Amortization of intangible assets amounted to $442,000, $427,000 and $408,000 for the years ended December 31, 2018, 2017 and 2016, respectively. Estimated future amortization of intangibles is $412,000 in 2019, $406,000 in both 2020 and 2021 and $88,000 in both 2022 and 2023.

Interest-Bearing Deposits

12 Months Ended

Dec. 31, 2018

Interest-Bearing Deposits [Abstract]

Interest-Bearing Deposits

Note 7
Interest-Bearing Deposits

Interest-bearing deposits consist of the following:

	December 31,
(In thousands)	2018			2017
Interest-bearing demand deposits	$	322,709		$	332,881
Savings deposits		13,502			11,168
Time deposits:
Less than $100		4,862			2,658
$100 to less than $250		51,658			33,385
$250 or more		15,937			16,455
Total	$	408,668		$	396,547
Weighted average interest rate		1.00	%		.56	%

Interest on deposits consists of the following:

	December 31,
(In thousands)	2018		2017		2016
Interest-bearing demand deposits	$	2,832	$	1,611	$	1,387
Savings deposits		109		79		100
Time deposits:
Less than $100		433		234		274
$100 to less than $250		152		114		191
$250 or more		210		149		77
Total	$	3,736	$	2,187	$	2,029

The scheduled maturities of time deposits are summarized as follows:

	December 31,
	2018				2017
			Percent				Percent
(In thousands)	Amount		of Total		Amount		of Total
Due within:
One year	$	51,154	70.6	%	$	48,370	92.1	%
Two years		18,262	25.2			281	0.5
Three years		140	0.2			2,383	4.5
Four years		983	1.4			25	0.1
Five years		1,918	2.6			1,439	2.8
Total	$	72,457	100.0	%	$	52,498	100.0	%

Unused Available Lines of Credit	12 Months Ended
Unused Available Lines of Credit	Dec. 31, 2018
Debt Disclosure [Abstract]
Unused Available Lines of Credit	Note 8 Unused Available Lines of Credit As of December 31, 2018, the Bank had unsecured lines of credit at correspondent banks to purchase federal funds up to a maximum of $83,000,000 at the following banks: US Bank, $20,000,000; UMB Bank $20,000,000; Wells Fargo Bank, $15,000,000; PNC Bank, $12,000,000; Frost National Bank, $10,000,000; and JPM Chase Bank, $6,000,000. As of December 31, 2018, the Bank had secured lines of credit with the Federal Home Loan Bank of $193,460,000 collateralized by commercial mortgage loans. At December 31, 2018, the Company had lines of credit from UMB Bank of $50,000,000 and First Tennessee Bank of $50,000,000 collateralized by state and political subdivision securities. There were no amounts outstanding under any of the lines of credit discussed above at December 31, 2018 or 2017.

Common Stock and Earnings per Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Common Stock and Earnings per Share

Note 9
Common Stock and Earnings per Share

The table below shows activity in the outstanding shares of the Company’s common stock during 2018.

	2018
Shares outstanding at January 1	12,286,896
20% stock dividend paid on December 14, 2018	2,457,484
Issuance of common stock:
Employee restricted stock grants	9,530
Employee SARs exercised	12,048
Directors’ compensation	9,526
Shares repurchased	(163,634	)
Shares forfeited	(564	)
Shares outstanding at December 31	14,611,286

Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share is computed by dividing net income by the sum of the weighted average number of common shares outstanding and the weighted average number of potential common shares outstanding. Under the treasury stock method, stock appreciation rights (“SARs”) are dilutive when the average market price of the Company’s common stock, combined with the effect of any unamortized compensation expense, exceeds the SAR price during a period. Anti-dilutive shares are those SARs with prices in excess of the current market value.

The calculations of basic and diluted earnings per share are as follows:

	December 31,
(In thousands except share and per share data)	2018		2017		2016
Basic:
Net income	$	30,268	$	25,014	$	24,348
Weighted average common shares outstanding		14,675,136		14,700,557		14,718,228
Basic earnings per share	$	2.06	$	1.70	$	1.65
Diluted:
Net income	$	30,268	$	25,014	$	24,348
Weighted average common shares outstanding		14,675,136		14,700,558		14,718,228
Effect of dilutive restricted stock, performance based restricted stock (“PBRS”), and SARs		239,065		215,332		206,878
Weighted average common shares outstanding assuming dilution		14,914,202		14,915,890		14,925,106
Diluted earnings per share	$	2.03	$	1.68	$	1.63

All share and per share data have been restated to give effect to the 20% stock dividend that was paid on December 14, 2018

Employee Benefit Plans

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Employee Benefit Plans

Note 10
Employee Benefit Plans

Defined Benefit Plan
The Company has a noncontributory defined-benefit pension plan (the “Plan”), which covers most of its employees. Effective December 31, 2016, the Plan was closed to all new participants. The Company accrues and makes contributions designed to fund normal service costs on a current basis using the projected unit credit with service proration method to amortize prior service costs arising from improvements in pension benefits and qualifying service prior to the establishment of the Plan over a period of approximately 30 years.

A summary of the activity in the Plan’s projected benefit obligation, assets, funded status and amounts recognized in the Company’s consolidated balance sheets is as follows:

(In thousands)	2018			2017
Projected benefit obligation:
Balance, January 1	$	98,790		$	85,551
Service cost		4,017			3,733
Interest cost		3,703			3,621
Actuarial (gain) loss		(7,768	)		7,916
Benefits paid		(2,341	)		(2,031	)
Balance, December 31	$	96,401		$	98,790
Plan assets:
Fair value, January 1	$	81,427		$	73,168
Actual return		(4,506	)		10,290
Employer contribution		—			—
Benefits paid		(2,341	)		(2,031	)
Fair value, December 31	$	74,580		$	81,427
Funded status:
Accrued pension liability	$	(21,821	)	$	(17,363	)

The following represent the major assumptions used to determine the projected benefit obligation of the Plan. For 2018, 2017 and 2016, the Plan’s expected benefit cash flows were discounted using the Citibank Above Median Curve. For 2018, the RP-2014 Mortality Table and the MP-2018 Mortality Improvement Table were used. For 2017, the RP-2014 Mortality Table and MP-2017 Mortality Improvement Table were used. For 2016, the RP-2014 Mortality Table and MP-2016 Mortality Improvement Table were used.

	2018		2017		2016
Weighted average discount rate	4.30	%	3.75	%	4.25	%
Rate of increase in compensation levels	(a)		(a)		(a)

(a)	6.0% graded down to 3.25% over the first seven years of service.

The accumulated benefit obligation was $83,724,000 and $85,236,000 as of December 31, 2018 and 2017, respectively. The Company does not expect to make a contribution to the Plan in 2019. The following pension benefit payments, which reflect expected future service, as appropriate, are expected to be paid by the Plan:

	Amount
2019	$	2,893,000
2020		3,099,000
2021		3,363,000
2022		3,769,000
2023		4,196,000
2024-2028		25,643,000

The Plan’s pension cost included the following components:

	For the Year Ended
	December 31,
(In thousands)	2018			2017			2016
Service cost – benefits earned during the year	$	4,017		$	3,733		$	3,559
Interest cost on projected benefit obligations		3,703			3,621			3,505
Expected return on plan assets		(5,202	)		(4,681	)		(4,734	)
Net amortization and deferral		1,522			1,382			1,259
Net periodic pension cost	$	4,040		$	4,055		$	3,589

The following represent the major assumptions used to determine the net pension cost of the Plan:

	2018		2017		2016
Weighted average discount rate	3.75	%	4.25	%	4.50	%
Rate of increase in compensation levels	(a	)	(a	)	(a	)
Expected long-term rate of return on assets	6.50	%	6.50	%	6.75	%

(a)	6.0% graded down to 3.25% over the first seven years of service

For 2018, the RP-2014 Mortality Table and the MP-2017 Mortality Improvement Table were used. For 2017, the RP-2014 Mortality Table and the MP-2016 Mortality Improvement Table were used. For 2016, the RP-2014 Mortality Table and the MP-2015 Mortality Improvement Table were used.

The investment objective for the Plan is to maximize total return with a tolerance for average risk. Asset allocation is a balance between fixed income and equity investments, with a target allocation of approximately 51% fixed income, 19% U.S. equity and 30% non-U.S. equity. Due to volatility in the market, this target allocation is not always desirable and asset allocations can fluctuate between acceptable ranges. The fixed income component is invested in pooled investment grade securities. The equity components are invested in pooled large cap, small/mid cap and non-U.S. stocks. The expected one-year nominal returns and annual standard deviations are shown by asset class below:

			One-Year Nominal		Annual Standard
Asset Class	% of Total Portfolio		Return		Deviation
Core Fixed Income	51	%	4.44	%	3.90	%
Large Cap U.S. Equities	14	%	7.02	%	15.10	%
Small Cap U.S. Equities	5	%	8.04	%	18.75	%
International (Developed)	25	%	8.19	%	17.36	%
International (Emerging)	5	%	10.45	%	25.35	%

Applying appropriate correlation factors between each of the asset classes the long-term rate of return on assets is estimated to be 6.50%.

A summary of the fair value measurements by type of asset is as follows:

	Fair Value Measurements as of December 31,
	2018						2017
			Quoted Prices						Quoted Prices
			in Active						in Active
			Markets for		Significant				Markets for		Significant
			Identical		Observable				Identical		Observable
			Assets		Inputs				Assets		Inputs
(In thousands)	Total		(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)
Cash	$	423	$	423	$	—	$	374	$	374	$	—
Equity securities
U.S. Small/Mid Cap Growth		3,405		—		3,405		4,111		—		4,111
Non-U. S. Core		18,398		—		18,398		21,065		—		21,065
U.S. Large Cap Passive		10,471		—		10,471		11,717		—		11,717
Emerging Markets		3,217		—		3,217		4,052		—		4,052
Fixed Income
U.S. Core		10,609		—		10,609		11,284		—		11,284
U.S. Passive		23,827		—		23,827		24,345		—		24,345
Opportunistic		4,230		—		4,230		4,479		—		4,479
Total	$	74,580	$	423	$	74,157	$	81,427	$	374	$	81,053

Supplemental Executive Retirement Plan
The Company also has an unfunded supplemental executive retirement plan (“SERP”) which covers key executives of the Company whose benefits are limited by the Internal Revenue Service under the Company’s qualified retirement plan. The SERP is a noncontributory plan in which the Company’s subsidiaries make accruals designed to fund normal service costs on a current basis using the same method and criteria as the Plan.

A summary of the activity in the SERP’s projected benefit obligation, funded status and amounts recognized in the Company’s consolidated balance sheets is as follows:

	December 31,
(In thousands)	2018			2017
Benefit obligation:
Balance, January 1	$	10,094		$	9,132
Service cost		92			143
Interest cost		348			360
Benefits paid		(260	)		(247	)
Actuarial (gain) loss		(177	)		706
Balance, December 31	$	10,097		$	10,094

The following represent the major assumptions used to determine the projected benefit obligation of the SERP. For 2018, 2017 and 2016, the SERP’s expected benefit cash flows were discounted using the Citigroup Above Median Curve.

	2018		2017		2016
Weighted average discount rate	4.10	%	3.50	%	4.00	%
Rate of increase in compensation levels	(a)		(a)		(a)

(a)	6.00% graded down to 3.25% over the first seven years of service.

The accumulated benefit obligation was $8,830,000 and $8,734,000 as of December 31, 2018 and 2017, respectively. Since this is an unfunded plan, there are no plan assets. Benefits paid were $260,000 in 2018, and $247,000 in both 2017 and 2016. Expected future benefits payable by the Company over the next ten years are as follows:

	Amount
2019	$	313,000
2020		312,000
2021		372,000
2022		749,000
2023		817,000
2024-2028		4,014,000

The SERP’s pension cost included the following components:

	For the Year Ended December 31,
(In thousands)	2018		2017		2016
Service cost – benefits earned during the year	$	92	$	143	$	133
Interest cost on projected benefit obligations		348		360		367
Net amortization and deferral		581		324		295
Net periodic pension cost	$	1,021	$	827	$	795

The pretax amounts in accumulated other comprehensive loss as of December 31 were as follows:

	The Plan				SERP
(In thousands)	2018		2017		2018		2017
Prior service cost	$	—	$	—	$	—	$	—
Net actuarial loss		23,580		23,160		1,629		2,388
Total	$	23,580	$	23,160	$	1,629	$	2,388

The estimated pretax prior service cost and net actuarial loss in accumulated other comprehensive loss at December 31, 2018 expected to be recognized as components of net periodic benefit cost in 2019 for the Plan are $0 and $1,634,000, respectively. The estimated pretax prior service cost and net actuarial loss in accumulated other comprehensive loss at December 31, 2018 expected to be recognized as components of net periodic benefit cost in 2019 for the SERP are $0 and $277,000, respectively.

The Company also maintains a noncontributory profit sharing program, which covers most of its employees. Employer contributions are calculated based upon formulas which relate to current operating results and other factors. Profit sharing expense recognized in the consolidated statements of income in 2018, 2017 and 2016 was $6,810,000, $5,799,000, and $5,367,000, respectively.

The Company also sponsors a defined contribution 401(k) plan to provide additional retirement benefits to substantially all employees. Contributions under the 401(k) plan for 2018, 2017 and 2016 were $1,109,000, $925,000, and $658,000, respectively.

Stock-based Compensation

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based Compensation

Note 11
Stock-based Compensation

The Amended and Restated Omnibus Stock and Performance Compensation Plan (the “Omnibus Plan”) provides incentive opportunities for key employees and non-employee directors and to align the personal financial interests of such individuals with those of the Company’s shareholders. The Omnibus Plan permits the issuance of up to 1,500,000 shares of the Company’s common stock in the form of stock options, SARs, restricted stock, restricted stock units and performance awards.

All share and per share data have been restated to give effect to the 20% stock dividend that was paid on December 14, 2018.

Restricted Stock
Restricted shares granted prior to April 16, 2013 are amortized to expense over the three-year vesting period. Beginning on April 16, 2013, restricted shares granted to Company employees are amortized to expense over the three-year annual vesting period whereas restricted shares granted to members of the Board of Directors are amortized to expense over a one-year service period, with the exception of those shares granted in lieu of cash payment for retainer fees which are expensed in the period earned. Beginning on February 2, 2017, restricted shares granted to Company employees are amortized to expense over the three-year cliff vesting period.

Changes in restricted shares outstanding for the year ended December 31, 2018 were as follows:

			Weighted Average
			Grant Date
	Shares		Fair Value
Balance at December 31, 2017	93,775		$41.92
Granted	35,000		49.79
Vested	(28,487	)	39.03
Forfeited	(564	)	46.70
Balance at December 31, 2018	99,724		$45.48

During 2017 and 2016, 31,277 and 47,779 shares, respectively, were granted with weighted average per share market values at date of grant of $49.55 in 2017 and $38.13 in 2016. The fair value of such shares are based on the market price on the date of grant. Amortization of the restricted stock bonus awards totaled $1,571,000 for 2018, $1,743,000 for 2017 and $1,712,000 for 2016. As of December 31, 2018, the total unrecognized compensation expense related to non-vested restricted stock awards was $1,345,000 and the related weighted average period over which it is expected to be recognized is approximately 0.75 years. The total fair value of shares vested during the years ended December 2018, 2017, and 2016 was $1,112,000, $1,389,000, and $1,500,000, respectively.

Performance-Based Restricted Stock

In February of 2017, the Company granted three-year PBRS awards which are contingent upon the Company’s achievement of pre-established financial goals over the period from January 1, 2017 through December 31, 2019. The PBRS awards cliff vest on the three year anniversary of their grant date at levels ranging from 0% to 150% of the target opportunity based on the actual achievement of financial goals for the three-year performance period. The aggregate target number of PBRS shares granted was 30,388 with an average grant date fair value of $49.33 per share. The 2018 expense related to these grants totaled $690,000 and is based on the grant date fair value of the awards and the Company’s achievement of 132% of the target financial goals. The estimated expense for 2018 and each future period through the vesting date is subject to prospective adjustment based upon changes in the expected achievement of the financial goals.

In each of February and July of 2018, the Company granted three-year PBRS awards which are contingent upon the Company’s achievement of pre-established financial goals over the period from January 1, 2018 through December 31, 2020. The PBRS awards cliff vest on the three-year anniversary of their grant date at levels ranging from 0% to 150% of the target opportunity based on the actual achievement of financial goals for the three-year performance period. The aggregate target number of PBRS shares granted was 35,602 with an average grant date fair value of $48.67 per share. The 2018 expense related to these grants totaled $745,000 and is based on the grant date fair value of the awards and the Company’s achievement of 144% of the target financial goals. The estimated expense for 2018 and each future period through the vesting date is subject to prospective adjustment based upon changes in the expected achievement of the financial goals.

SARs

During 2018, there were no SARs granted and no expense recognized. As of December 31, 2018, there was no unrecognized compensation expense related to SARs.

Changes in SARs outstanding for the year ended December 31, 2018 were as follows:

	SARs		Weighted Average Exercise Price
Balance at December 31, 2017	281,067			$29.14
Exercised	(43,946	)		25.26
Forfeited	—			—
Balance at December 31, 2018	237,121			29.86
Exercisable at December 31, 2018	237,121			$29.86

The total intrinsic value of SARs exercised during 2018 and 2017 was $1,110,000 and $892,000, respectively. The average remaining contractual term for SARs outstanding as of December 31, 2018 was 3.50 years, and the aggregate intrinsic value was $5,468,000. The average remaining contractual term for SARs exercisable as of December 31, 2017 was 5.03 years, and the aggregate intrinsic value was $7,291,000.

The total compensation cost for share-based payment arrangements was $3,006,000, $2,340,000, and $1,959,000 in 2018, 2017, and 2016, respectively.

Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Note 13
Income Taxes

The components of income tax expense are as follows:

	For the Years Ended December 31,
(In thousands)		2018			2017			2016
Current:
Federal	$	8,557		$	4,250		$	6,456
State		1,043			1,638			941
Deferred:
Federal		(3,404	)		4,256			301
State		(117	)		(259	)		18
Total income tax expense	$	6,079		$	9,885		$	7,716

A reconciliation of expected income tax expense, computed by applying the effective federal statutory rate of 21% for 2018 and 35% for each of 2017 and 2016 to income before income tax expense is as follows:

	For the Years Ended December 31,
(In thousands)		2018			2017			2016
Expected income tax expense	$	7,633		$	12,214		$	11,223
(Reductions) increases resulting from:
Tax-exempt income		(2,009	)		(3,868	)		(3,754	)
State taxes, net of federal benefit		732			896			623
Share-based compensation adjustment		(286	)		(376	)		—
Adjustment of deferred tax asset or liability for TCJA		(74	)		1,824			—
Other, net		83			(805	)		(376	)
Total income tax expense	$	6,079		$	9,885		$	7,716

On December 22, 2017, the TCJA was enacted. Among other things, the new law (i) establishes a new, flat corporate federal statutory income tax rate of 21%; (ii) eliminates the corporate alternative minimum tax and allows the use of any such carryforwards to offset regular tax liability for any taxable year; (iii) limits the deduction for net interest expense incurred by U.S. corporations; (iv) allows businesses to immediately expense, for tax purposes, the cost of new investments in certain qualified depreciable assets; (v) eliminates or reduces certain deductions related to meals and entertainment expenses; (vi) modifies the limitation on excessive employee remuneration to eliminate the exception for performance-based compensation and clarifies the definition of a covered employee; and (vii) limits the deductibility of deposit insurance premiums. The TCJA also significantly changes U.S. tax law related to foreign operations, though, such changes do not currently impact the Company on a significant level.

Also on December 22, 2017, the SEC issued SAB 118, which provides guidance on accounting for tax effects of the TCJA. SAB 118 provides a measurement period of up to one year from the enactment date to complete the accounting. Based on the information available and current interpretation of the rules at December 31, 2017, the Company made provisional estimates of the impact of the reduction in the corporate tax rate and remeasurement of certain deferred tax assets and liabilities based on the rate at which they were expected to reverse in the future totaling $1,824,000. The final analysis and measurement was completed during the fourth quarter of 2018 when the Company filed the 2017 U.S. federal income tax return and a reduction of tax expense in the amount of $74,000 was recorded.

Income tax expense in 2018 totaled $6,079,000 compared to $9,885,000 and $7,716,000 in 2017 and 2016, respectively. When measured as a percent of pre-tax income, the Company’s effective tax rate was 17% in 2018, 28% in 2017, and 24% in 2016. The decrease in 2018 tax expense was primarily the result of two items:

●	the decrease in the federal income tax rate and
●	the one-time, non-cash charge of $1,824,000 that increased 2017 tax expense triggered by the passage of the TCJA on December 22, 2017.

The Company’s effective tax rate for 2018 was 17% and the Company’s 2017 effective tax rate was 25% excluding the onetime TCJA charge. The Company’s effective tax rate has traditionally been lower than the statutory rate because of investments and loans that are tax exempt.

The tax effects of temporary differences which give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below:

	December 31,
(In thousands)		2018			2017
Deferred tax assets:
Allowance for loan losses	$	2,376		$	2,413
ASC 715 pension funding liability		6,000			6,080
Net operating loss carryforward ⁽¹⁾		50			76
Supplemental executive retirement plan accrual		1,968			1,833
Stock compensation		1,673			1,307
Other		—			118
Total deferred tax assets	$	12,067		$	11,827
Deferred tax liabilities:
Premises and equipment		(1,937	)		(2,248	)
Pension		(409	)		(1,379	)
Intangible assets		(1,212	)		(1,091	)
Unrealized gain on investment in securities available-for-sale		(156	)		(1,938	)
Deferred income		—			(2,121	)
Other		(80	)		—
Total deferred tax liabilities	$	(3,794	)	$	(8,777	)
Net deferred tax assets	$	8,273		$	3,050

⁽¹⁾

As of December 31, 2018, the Company had approximately $238,000 of net operating loss carry forwards as a result of the acquisition of Franklin Bancorp. The utilization of the net operating loss carry forward is subject to Section 382 of the Internal Revenue Code and limits the Company’s use to approximately $122,000 per year during the carry forward period, which expires in 2020.

A valuation allowance would be provided on deferred tax assets when it is more likely than not that some portion of the assets will not be realized. The Company has not established a valuation allowance at December 31, 2018 or 2017, due to management’s belief that all criteria for recognition have been met, including the expectation of projected future taxable income sufficient to support the realization of deferred tax assets.

The reconciliation of the beginning unrecognized tax benefits balance to the ending balance is presented in the following table:

(In thousands)	2018			2017			2016
Balance at January 1	$	1,632		$	1,623		$	1,194
Changes in unrecognized tax benefits as a result of tax positions taken during a prior year		(135	)		(15	)		407
Changes in unrecognized tax benefits as a result of tax position taken during the current year		192			263			311
Decreases in unrecognized tax benefits relating to settlements with taxing authorities		—			—			—
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations		(286	)		(239	)		(289	)
Balance at December 31	$	1,403		$	1,632		$	1,623

At December 31, 2018, 2017 and 2016, the balance of the Company’s unrecognized tax benefits which would, if recognized, affect the Company’s effective tax rate was $1,272,000, $1,464,000 and $1,225,000, respectively. These amounts are net of the offsetting benefits from other taxing jurisdictions.

As of December 31, 2018, 2017 and 2016, the Company had $136,000, $139,000 and $108,000, respectively, in accrued interest related to unrecognized tax benefits. During 2018, the Company recorded a net decrease in accrued interest of $3,000 and in 2017 a net increase of $31,000. The Company recognizes income tax related interest and penalties in income tax expense.

The Company believes it is reasonably possible that the total amount of tax benefits will decrease by approximately $316,000 over the next 12 months. The reduction primarily relates to the anticipated lapse in the statute of limitations. The unrecognized tax benefits relate primarily to apportionment of taxable income among various state tax jurisdictions.

The Company is subject to income tax in the U.S. federal jurisdiction, numerous state jurisdictions, and a foreign jurisdiction. The Company’s federal income tax returns for tax years 2015 through 2017 remain subject to examination by the Internal Revenue Service. In addition, the Company is subject to state tax examinations for the tax years 2014 through 2017 and currently is not under examination in any tax jurisdictions.

Disclosures about Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Disclosures about Fair Value of Financial Instruments

Note 15
Disclosures about Fair Value of Financial Instruments

The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, commercial letters of credit and standby letters of credit. The Company’s maximum potential exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit, commercial letters of credit and standby letters of credit is represented by the contractual amounts of those instruments. At December 31, 2018 and 2017, no amounts have been accrued for any estimated losses for these instruments.

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commercial and standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. These off-balance sheet financial instruments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The approximate remaining terms of commercial and standby letters of credit range from less than one to five years. Since these financial instruments may expire without being drawn upon, the total amounts do not necessarily represent future cash requirements. Commitments to extend credit and letters of credit are subject to the same underwriting standards as those financial instruments included on the consolidated balance sheets. The Company evaluates each customer’s credit-worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary upon extension of the credit, is based on management’s credit evaluation of the borrower. Collateral held varies, but is generally accounts receivable, inventory, residential or income-producing commercial property or equipment. In the event of nonperformance, the Company may obtain and liquidate the collateral to recover amounts paid under its guarantees on these financial instruments.

The following table shows conditional commitments to extend credit, standby letters of credit and commercial letters:

	December 31,
(In thousands)		2018		2017
Conditional commitments to extend credit		$	144,010	$	87,013
Standby letters of credit			11,368		14,347
Commercial letters of credit			3,486		3,246

The fair value of commitments to extend credit and standby letters of credit is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, the likelihood of the counterparties drawing on such financial instruments and the present credit worthiness of such counterparties. The Company believes such commitments have been made at terms which are competitive in the markets in which it operates; however, no premium or discount is offered thereon.

Following is a summary of the carrying amounts and fair values of the Company’s financial instruments:

	December 31,
	2018				2017
	Carrying				Carrying
(In thousands)	Amount		Fair Value		Amount		Fair Value
Balance sheet assets:
Cash and cash equivalents	$	230,933	$	230,933	$	228,110	$	228,110
Investment in securities		441,534		441,534		470,523		470,523
Loans, net		711,362		711,090		676,026		675,020
Accrued interest receivable		7,069		7,069		7,413		7,413
Total	$	1,390,898	$	1,390,626	$	1,382,072	$	1,381,066

Balance sheet liabilities:
Deposits	$	721,926	$	722,018	$	678,088	$	678,346
Accounts and drafts payable		694,360		694,360		661,888		661,888
Accrued interest payable		91		91		55		55
Total	$	1,416,377	$	1,416,469	$	1,340,031	$	1,340,289

The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:

Cash and Cash Equivalents The carrying amount approximates fair value.

Investment in Securities The fair value is measured on a recurring basis using Level 2 valuations. Refer to Note 3, “Investment in Securities,” for fair value and unrealized gains and losses by investment type.

Loans The fair value is estimated using present values of future cash flows discounted at risk-adjusted interest rates for each loan category designated by management and is therefore a Level 3 valuation. Management believes that the risk factor embedded in the interest rates along with the allowance for loan losses results in a fair valuation.

Impaired loans are valued using the fair value of the collateral which is based upon an observable market price or current appraised value and therefore, the fair value is a nonrecurring Level 3 valuation.

Accrued Interest Receivable The carrying amount approximates fair value.

Deposits The fair value of demand deposits, savings deposits and certain money market deposits is the amount payable on demand at the reporting date. The fair value of fixed-maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities and therefore, is a Level 2 valuation. The fair value estimates above do not include the benefit that results from the low-cost funding provided by the deposit liabilities compared to the cost of borrowing funds in the market or the benefit derived from the customer relationship inherent in existing deposits.

Accounts and Drafts Payable The carrying amount approximates fair value.

Accrued Interest The carrying amount approximates fair value.

Limitations Fair value estimates are based on existing on- and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Other significant assets or liabilities that are not considered financial assets or liabilities include premises and equipment and the benefit that results from the low-cost funding provided by the deposit liabilities compared to the cost of borrowing funds in the market (core deposit intangible). In addition, tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in any of the estimates.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

12 Months Ended

Dec. 31, 2018

Revenue from Contracts with Customers

Note 16
Revenue from Contracts with Customers

On January 1, 2018, the Company adopted FASB ASC 606 and selected the modified retrospective transition method. The adoption of this new standard did not impact the Company’s results of operations or balance sheet and there was no cumulative effect of initially applying this new revenue standard to the opening balance of retained earnings. Since interest income on loans and securities are both excluded from this topic, a significant portion of the Company’s revenues are not subject to the new guidance. The services that fall within the scope of FASB ASC 606 are presented within fee revenue and other income in the Consolidated Statements of Income and are recognized as revenue as the obligation to the customer is satisfied. Services within the scope of FASB ASC 606 include invoice processing and payment fees, bank service fees, and other real estate owned (“OREO”).

Invoice processing fees – The Company earns fees on a per-item or monthly basis for the invoice processing services rendered on behalf of customers. Per-item fees are recognized at the point in time when the performance obligation is satisfied. Monthly fees are earned over the course of a month, representing the period over which the performance obligation is satisfied. The Company also earns interest income from the balances generated during the payment cycle for the invoices processed, which is an integral component of the Company's compensation for invoice processing services but is out-of-scope of FASB ASC 606. The contracts have no significant impact of variable consideration and no significant financing components.

Invoice payment fees – The Company earns fees on a transaction level basis for invoice payment services when making customer payments. Fees are recognized at the point in time when the payment transactions are made, which is when the performance obligation is satisfied. The contracts have no significant impact of variable consideration and no significant financing components.

Bank service fees – Revenue from service fees consists of service charges and fees on deposit accounts under depository agreements with customers to provide access to deposited funds. Service charges on deposit accounts are transaction based fees that are recognized at the point in time when the performance obligation is satisfied. Service charges are recognized on a monthly basis representing the period over which the performance obligation is satisfied. The contracts have no significant impact of variable consideration and no significant financing components.

OREO – The Company currently does not have any OREO and has not in recent years. Net gains or losses would be recorded when other real estate is sold to a third party and substantially all of the consideration for the transfer of property is received.

	For the Years Ended December 31,
(In thousands)	2018		2017		2016
Fee revenue and other income
In-scope of FASB ASC 606
Invoice processing fees	$	78,461	$	72,961	$	67,276
Invoice payment fees		23,720		20,361		16,437
Information services payment and processing revenue		102,181		93,322		83,713
Bank service fees		1,335		1,349		1,276
Fee revenue (in-scope of FASB ASC 606)		103,516		94,671		84,989
Other income (out-of-scope of FASB ASC 606)		560		841		1,147
Total fee revenue and other income		104,076		95,512		86,136

Net interest income after provision for loan losses (out-of-scope of FASB ASC 606)		44,190		39,790		39,401
Total net revenue	$	148,266	$	135,302	$	125,537

Industry Segment Information

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Industry Segment Information

Note 17
Industry Segment Information

The services provided by the Company are classified into two reportable segments: Information Services and Banking Services. Each of these segments provides distinct services that are marketed through different channels. They are managed separately due to their unique service and processing requirements.

The Information Services segment provides transportation, energy, telecommunication, and environmental invoice processing and payment services to large corporations. The Banking Services segment provides banking services primarily to privately held businesses and faith-based ministries as well as supporting the banking needs of the Information Services segment.

The Company’s accounting policies for segments are the same as those described in Note 1 of this report. Management evaluates segment performance based on tax-equivalized (as defined in the footnote to the chart on the following table) pre-tax income after allocations for corporate expenses. Transactions between segments are accounted for at what management believes to be fair value.

Substantially all revenue originates from, and all long-lived assets are located within the United States, and no revenue from any customer of any segment exceeds 10% of the Company’s consolidated revenue.

Funding sources represent average balances and deposits generated by Information Services and Banking Services and there is no allocation methodology used. Segment interest income is a function of the relative share of average funding sources generated by each segment multiplied by the following rates:

●	Information Services – one or more fixed rates depending upon the specific characteristics of the funding source, and
●	Banking Services – a variable rate that is based upon the overall performance of the Company’s earning assets.

Any difference between total segment interest income and overall total Company interest income is included in Corporate, Eliminations, and Other. Certain amounts in the table below for 2017 and 2016 have been reclassified to conform to 2018 presentation.

Summarized information about the Company’s operations in each industry segment for the years ended December 31, 2018, 2017 and 2016, is as follows:

						Corporate,
		Information		Banking		Eliminations
*(In thousands)*		Services		Services		and Other			Total
*2018*
Fee income from customers	$	102,839	$	1,307	$	(70	)	$	104,076
Interest income*		22,273		23,706		4,369			50,348
Interest expense		—		3,736		—			3,736
Intersegment income (expense)		—		1,880		(1,880	)		—
Depreciation and amortization		4,254		142		—			4,396
Tax-equivalized pre-tax income*		24,962		11,625		2,181			38,768
Goodwill		12,433		136		—			12,569
Other intangible assets, net		1,554		—		—			1,554
Total Assets		826,201		886,291		(17,316	)		1,695,176

Funding Sources		642,733		572,653		—			1,215,386
*2017*
Fee income from customers	$	93,484	$	1,547	$	481		$	95,512
Interest income*		20,634		23,732		3,301			47,667
Interest expense		—		2,187		—			2,187
Intersegment income (expense)		—		1,362		(1,362	)		—
Depreciation and amortization		3,902		149		—			4,051
Tax-equivalized pre-tax income*		24,990		13,691		1,908			40,589
Goodwill		12,433		136		—			12,569
Other intangible assets, net		1,996		—		—			1,996
Total Assets		854,214		830,672		(27,677	)		1,603,209
Funding Sources		604,493		598,986		—			1,203,479
*2016*
Fee income from customers	$	83,821	$	1,417	$	898		$	86,136
Interest income*		18,729		24,088		2,614			45,431
Interest expense		—		2,029		—			2,029
Intersegment income (expense)		—		1,136		(1,136	)		—
Depreciation and amortization		3,488		165		—			3,653
Tax-equivalized pre-tax income*		20,065		15,090		2,410			37,565
Goodwill		11,454		136		—			11,590
Other intangible assets, net		1,997		—		—			1,997
Total Assets		763,999		756,164		(15,324	)		1,504,839
Funding Sources		545,726		614,974		—			1,160,700

*	Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.

Condensed Financial Information of Parent Company

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Condensed Financial Information of Parent Company

Note 19
Condensed Financial Information of Parent Company

Following are the condensed balance sheets of the Company (parent company only) and the related condensed statements of income and cash flows.

	Condensed Balance Sheets
	December 31,
(In thousands)	2018		2017
Assets
Cash and due from banks	$	35,735	$	56,462
Short-term investments		35,201		48,324
Securities available-for-sale, at fair value		441,534		470,523
Loans, net		20,188		12,239
Investments in subsidiaries		130,231		113,681
Premises and equipment, net		21,358		20,927
Other assets		278,151		199,865
Total assets	$	962,398	$	922,021
Liabilities and Shareholders’ Equity
Liabilities:
Accounts and drafts payable	$	693,026	$	661,342
Other liabilities		39,362		35,533
Total liabilities		732,388		696,875
Total shareholders’ equity		230,010		225,146
Total liabilities and shareholders’ equity	$	962,398	$	922,021

	Condensed Statements of Income
	For the Years Ended December 31,
(In thousands)	2018			2017		2016
Income from subsidiaries:
Interest	$	—		$	—	$	2
Management fees		2,668			2,172		2,105
Income from subsidiaries		2,668			2,172		2,107
Information services revenue		100,628			93,133		83,543
Net interest income after provision		14,159			13,217		13,389
(Loss) Gain on sales of investment securities		(42	)		—		387
Other income		456			483		504
Total income		117,869			109,005		99,930
Expenses:
Salaries and employee benefits		77,946			70,409		65,968
Other expenses		23,442			20,333		18,133
Total expenses		101,388			90,742		84,101
Income before income tax and equity in undistributed
income of subsidiaries		16,481			18,263		15,829
Income tax expense		1,788			4,394		1,540
Income before undistributed income of subsidiaries		14,693			13,869		14,289
Equity in undistributed income of subsidiaries		15,575			11,145		10,059
Net income	$	30,268		$	25,014	$	24,348

	Condensed Statements of Cash Flows
	For the Years Ended December 31,
(In thousands)	2018			2017			2016
Cash flows from operating activities:
Net income	$	30,268		$	25,014		$	24,348
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Equity in undistributed income of subsidiaries		(15,575	)		(11,145	)		(10,059	)
Net change in other assets		(76,686	)		(41,013	)		(7,085	)
Net change in other liabilities		3,829			10,118			6,683
Amortization of stock-based awards		2,583			1,743			1,677
Other, net		10,242			9,219			7,558
Net cash provided by (used in) operating activities		(45,339	)		(6,064	)		23,122
Cash flows from investing activities:
Net decrease (increase) in securities		14,615			(80,621	)		(33,025	)
Net (increase) decrease in loans		(7,949	)		34,944			40,431
Purchases of premises and equipment, net		(4,211	)		(4,020	)		(4,557	)
Net cash (used in) provided by investing activities		2,455			(49,697	)		2,849
Cash flows from financing activities:
Net increase in accounts and drafts payable		31,684			20,397			64,026
Cash dividends paid		(13,177	)		(10,675	)		(9,979	)
Purchase of common shares for treasury		(8,838	)		(2,270	)		(9,215	)
Other financing activities		(635	)		(267	)		1,705
Net cash provided by financing activities		9,034			7,185			46,537
Net (decrease) increase in cash and cash equivalents		(33,850	)		(48,576	)		72,508
Cash and cash equivalents at beginning of year		104,786			153,362			80,854
Cash and cash equivalents at end of year	$	70,936		$	104,786		$	153,362

SUPPLEMENTARY FINANCIAL INFORMATION

12 Months Ended

Dec. 31, 2018

Supplemental Income Statement Elements [Abstract]

SUPPLEMENTARY FINANCIAL INFORMATION

Note 20
SUPPLEMENTARY FINANCIAL INFORMATION
(Unaudited)

	First		Second		Third		Fourth
(In thousands except per share data)	Quarter		Quarter		Quarter		Quarter			YTD
*2018*
Fee revenue and other income	$	25,374	$	25,640	$	26,435	$	26,627		$	104,076
Interest income		11,288		11,513		12,215		12,910			47,926
Interest expense		679		794		1,029		1,234			3,736
Net interest income		10,609		10,719		11,186		11,676			44,190
Provision for loan losses		—		—		—		—			—
Operating expense		26,182		27,463		28,530		29,744			111,919
Income tax expense		1,709		1,387		1,481		1,502			6,079
Net income	$	8,092	$	7,509	$	7,610	$	7,057		$	30,268
Net income per share:
Basic earnings per share	$	.55	$	.51	$	.52	$	.48		$	2.06
Diluted earnings per share		.54		.50		.51		.47			2.03
*2017*
Fee revenue and other income	$	22,771	$	23,800	$	24,207	$	24,734		$	95,512
Interest income		9,999		10,332		10,665		10,981			41,977
Interest expense		480		470		571		666			2,187
Net interest income		9,519		9,862		10,094		10,315			39,790
Provision for loan losses		—		—		—		—			—
Operating expense		24,318		24,901		25,042		26,142			100,403
Income tax expense		1,665		2,248		2,396		3,576	⁽¹⁾		9,885	⁽¹⁾
Net income	$	6,307	$	6,513	$	6,863	$	5,331		$	25,014
Net income per share:
Basic earnings per share	$	.43	$	.44	$	.47	$	.36		$	1.70
Diluted earnings per share		.42		.44		.46		.36			1.68

⁽¹⁾	Includes one-time, non-cash TCJA charge of $1,824,000

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Operations	*Summary of Operations* Cass Information Systems, Inc. (the “Company”) provides payment and information services, which include processing and payment of transportation, energy, telecommunications and environmental invoices. These services include the acquisition and management of data, information delivery and financial exchange. The consolidated balance sheet captions, “Accounts and drafts payable” and “Payments in excess of funding,” represent the Company’s resulting financial position related to the payment services that are performed for customers. The Company also provides a full range of banking services to individual, corporate and institutional customers through Cass Commercial Bank (the “Bank”), its wholly owned bank subsidiary.
Basis of Presentation	*Basis of Presentation* The accounting and reporting policies of the Company and its subsidiaries conform to U.S. generally accepted accounting principles (“GAAP”). The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries after elimination of intercompany transactions. Certain amounts in the 2017 and 2016 consolidated financial statements have been reclassified to conform to the 2018 presentation. Such reclassifications have no effect on previously reported net income or shareholders’ equity. The Company issued a 20% stock dividend on December 14, 2018. The share and per share information have been restated unless indicated otherwise for all periods presented in the accompanying consolidated financial statements.
Use of Estimates	*Use of Estimates* In preparing the consolidated financial statements, Company management is required to make estimates and assumptions which significantly affect the reported amounts in the consolidated financial statements.
Cash and Cash Equivalents	*Cash and Cash Equivalents* For purposes of the consolidated statements of cash flows, the Company considers cash and due from banks, interest-bearing deposits in other financial institutions, federal funds sold and other short-term investments as segregated in the accompanying consolidated balance sheets to be cash equivalents.
Investment in Debt Securities	*Investment in Debt Securities* The Company classifies its debt marketable securities as available-for-sale. Securities classified as available-for-sale are carried at fair value. Unrealized gains and losses, net of the related tax effect, are excluded from earnings and reported in accumulated other comprehensive income, a component of shareholders’ equity. A decline in the fair value of any available-for-sale security below cost that is deemed other than temporary results in a charge to earnings and the establishment of a new cost basis for the security. To determine whether impairment is other than temporary, the Company considers guidance provided in the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 320 - Investments – Debt and Equity Securities. When determining whether a debt security is other-than-temporarily impaired, the Company assesses whether it has the intent to sell the security and whether it is more likely than not that the Company will be required to sell prior to recovery of the amortized cost basis. Evidence considered in this assessment includes the reasons for impairment, the severity and duration of the impairment, changes in value subsequent to year-end and forecasted performance of the investee. Premiums and discounts are amortized or accreted to interest income over the estimated lives of the securities using the level-yield method. Interest income is recognized when earned. Gains and losses are calculated using the specific identification method.
Allowance for Loan Losses	*Allowance for Loan Losses (“ALLL”)* The ALLL is increased by provisions charged to expense and is available to absorb charge-offs, net of recoveries. Management utilizes a systematic, documented approach in determining the appropriate level of the ALLL. Management’s approach provides for estimated credit losses on individually evaluated loans in accordance with FASB ASC 310 - Allowance for Credit Losses (“ASC 310”). These estimates are based upon a number of factors, such as payment history, financial condition of the borrower, expected future cash flows and discounted collateral exposure. Estimated credit losses inherent in the remainder of the portfolio are estimated in accordance with FASB ASC 450 - Contingencies. These loans are segmented into groups based on similar risk characteristics. Historical loss rates for each risk group, which are updated quarterly, are generally quantified using all recorded loan charge-offs and recoveries over a prescribed look-back period. These historical loss rates for each risk group are used as the starting point to determine the level of the allowance. The Company’s methodology incorporates an estimated loss emergence period for each risk group. The loss emergence period is the period of time from when a borrower experiences a loss event and when the actual loss is recognized in the financial statements, generally at the time of initial charge-off of the loan balance. The Company’s methodology also includes qualitative risk factors that allow management to adjust its estimates of losses based on the most recent information available and to address other limitations in the quantitative component that is based on historical loss rates. Such risk factors are generally reviewed and updated quarterly, as appropriate, and are adjusted to reflect changes in national and local economic conditions and developments, the volume and severity of delinquent and internally classified loans, loan concentrations, assessment of trends in collateral values, assessment of changes in borrowers’ financial stability, and changes in lending policies and procedures, including underwriting standards and collections, charge-off and recovery practices. Management believes the ALLL is adequate to absorb probable losses in the loan portfolio. Additionally, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s ALLL. Such agencies may require the Company to increase the ALLL based on their judgments and interpretations about information available to them at the time of their examinations.
Premises and Equipment	*Premises and Equipment* Premises and equipment are stated at cost less accumulated depreciation and amortization. Depreciation is computed over the estimated useful lives of the assets, or the respective lease terms for leasehold improvements, using straight-line and accelerated methods. Estimated useful lives do not exceed 40 years for buildings, the lesser of 10 years or the life of the lease for leasehold improvements and range from 3 to 7 years for software, equipment, furniture and fixtures. Maintenance and repairs are charged to expense as incurred.
Intangible Assets	*Intangible Assets* Cost in excess of fair value of net assets acquired has resulted from business acquisitions. Goodwill and intangible assets with indefinite useful lives are not amortized, but instead are tested for impairment at least annually. Intangible assets with definite useful lives are amortized on a straight-line basis over their respective estimated useful lives. Periodically, the Company reviews intangible assets for events or changes in circumstances that may indicate that the carrying amount of the assets may not be recoverable. Based on those reviews, adjustments of recorded amounts have not been required.
Non-marketable Equity Investments	*Non-marketable Equity Investments* The Company accounts for non-marketable equity investments, in which it holds less than a 20% ownership, under the cost method. Under the cost method of accounting, investments are carried at cost and are adjusted only for other than temporary declines in fair value, distributions of earnings and additional investments. The Company periodically evaluates whether any declines in fair value of its investments are other than temporary. In performing this evaluation, the Company considers various factors including any decline in market price, where available, the investee's financial condition, results of operations, operating trends and other financial ratios. Non-marketable equity investments are included in other assets on the consolidated balance sheets.
Foreclosed Assets	*Foreclosed Assets* Real estate acquired as a result of foreclosure is initially recorded at fair value less estimated selling costs. Fair value is generally determined through the receipt of appraisals. Any write down to fair value at the time the property is acquired is recorded as a charge-off to the allowance for loan losses. Any decline in the fair value of the property subsequent to acquisition is recorded as a charge to non-interest expense.
Treasury Stock	*Treasury Stock* Purchases of the Company’s common stock are recorded at cost. Upon reissuance, treasury stock is reduced based upon the average cost basis of shares held.
Comprehensive Income	*Comprehensive Income* Comprehensive income consists of net income, changes in net unrealized gains (losses) on available-for-sale securities and pension liability adjustments and is presented in the accompanying consolidated statements of shareholders' equity and consolidated statements of comprehensive income.
Loans	*Loans* Interest on loans is recognized based upon the principal amounts outstanding. It is the Company’s policy to discontinue the accrual of interest when there is reasonable doubt as to the collectability of principal or interest. Subsequent payments received on such loans are applied to principal if there is any doubt as to the collectability of such principal; otherwise, these receipts are recorded as interest income. The accrual of interest on a loan is resumed when the loan is current as to payment of both principal and interest and/or the borrower demonstrates the ability to pay and remain current. Loan origination and commitment fees on originated loans, net of certain direct loan origination costs, are deferred and amortized to interest income using the level-yield method over the estimated lives of the related loans.
Impairment of Loans	*Impairment of Loans* A loan is considered impaired when it is probable that a creditor will be unable to collect all amounts due, both principal and interest, according to the contractual terms of the loan agreement. When measuring impairment, the expected future cash flows of an impaired loan are discounted at the loan's effective interest rate. Alternatively, impairment could be measured by reference to an observable market price, if one exists, or the fair value of the collateral for a collateral-dependent loan. Regardless of the historical measurement method used, the Company measures impairment based on the fair value of the collateral when the Company determines foreclosure is probable. Additionally, impairment of a restructured loan is measured by discounting the total expected future cash flows at the loan's effective rate of interest as stated in the original loan agreement. The Company uses its nonaccrual methods as discussed above for recognizing interest on impaired loans.
Information Services Revenue	*Information Services Revenue* A majority of the Company’s revenues are attributable to fees for providing services. These services include transportation invoice rating, payment processing, auditing, and the generation of accounting and transportation information. The Company also processes, pays and generates management information from electric, gas, telecommunications, environmental, and other invoices. The specific payment and information processing services provided to each customer are developed individually to meet each customer’s specific requirements. The Company enters into service agreements with customers typically for fixed fees per transaction that are invoiced monthly. Revenues are recognized in the period services are rendered and earned under the service agreements, as long as collection is reasonably assured.
Income Taxes	*Income Taxes* Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. Deferred tax assets are reduced if necessary, by a deferred tax asset valuation allowance. In the event that management determines it is more likely than not that it will not be able to realize all or part of net deferred tax assets in the future, the Company adjusts the recorded value of deferred tax assets, which would result in a direct charge to income tax expense in the period that such determination is made. Likewise, the Company will reverse the valuation allowance when realization of the deferred tax asset is expected. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company and its subsidiaries file U.S. federal and certain state income tax returns on a consolidated basis. In addition, certain state jurisdictions are filed on a separate company basis by the Company or its subsidiaries. The Company recognizes and measures income tax benefits using a two-step model: 1) a tax position must be more likely than not to be sustained based solely on its technical merits in order to be recognized; and 2) the benefit must be measured as the largest dollar amount of that position that is more likely than not to be sustained upon settlement. The difference between the benefit recognized for a tax position in this model and the tax benefit claimed on a tax return is treated as an unrecognized tax benefit. The Company recognizes income tax related interest and penalties in income tax expense.
Earnings Per Share	*Earnings Per Share* Basic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding. Diluted earnings per share is computed by dividing net income by the sum of the weighted average number of common shares outstanding and the weighted average number of potential common shares outstanding.
Share-Based Compensation	*Stock-Based Compensation* The Company follows FASB ASC 718 - Accounting for Stock Options and Other Stock-based Compensation (“ASC 718”), which requires that all stock-based compensation be recognized as an expense in the financial statements and that such cost be measured at the fair value of the award. FASB ASC 718 also requires that excess tax benefits related to stock option exercises and restricted stock awards be reflected as financing cash inflows instead of operating cash inflows.
Pension Plans	*Pension Plans* The amounts recognized in the consolidated financial statements related to pension are determined from actuarial valuations. Inherent in these valuations are assumptions including expected return on plan assets, discount rates at which the liabilities could be settled at December 31, 2018, rate of increase in future compensation levels and mortality rates. These assumptions are updated annually and are disclosed in Note 10. The Company follows FASB ASC 715 - Compensation – Retirement Benefits (“ASC 715”), which requires companies to recognize the overfunded or underfunded status of a defined benefit postretirement plan as an asset or liability in its consolidated balance sheet and to recognize changes in that funded status in the year in which the changes occur through comprehensive income. The funded status is measured as the difference between the fair value of the plan assets and the projected benefit obligation as of the date of its fiscal year-end.
Fair Value Measurements	*Fair Value Measurements* The Company follows the provisions of FASB ASC 820 - Fair Value Measurements and Disclosures, which defines fair value, establishes a framework for measuring fair value in GAAP, and outlines disclosures about fair value measurements. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A three-level hierarchy for valuation techniques is used to measure financial assets and financial liabilities at fair value. This hierarchy is based on whether the valuation inputs are observable or unobservable. Financial instrument valuations are considered Level 1 when they are based on quoted prices in active markets for identical assets or liabilities. Level 2 financial instrument valuations use quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data. Financial instrument valuations are considered Level 3 when they are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable, and when determination of the fair value requires significant management judgment or estimation. The Company records securities available for sale at their fair values on a recurring basis using Level 2 valuations. Additionally, the Company records impaired loans and other real estate owned at their fair value on a nonrecurring basis. The nonrecurring fair value adjustments typically involve application of lower-of-cost-or-market accounting or impairment write-downs of individual assets.
Impact of New and Not Yet Adopted Accounting Pronouncements	Impact of New and Not Yet Adopted Accounting Pronouncements In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09 – Revenue from Contracts with Customers. The ASU supersedes revenue recognition requirements in Topic 605, Revenue Recognition, including most industry-specific revenue recognition guidance in the FASB Accounting Standards Codification (“ASC”). The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance identifies specific steps that entities should apply in order to achieve this principle. Under the ASU, the amendments are effective for interim and annual periods beginning January 1, 2018 and must be applied retrospectively. On January 1, 2018, the Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with Customers (“FASB ASC 606”), and selected the modified retrospective transition method. The adoption of this new standard did not impact the Company’s results of operations or balance sheet and there was no cumulative effect of initially applying this new revenue standard to the opening balance of retained earnings. Since interest income on loans and securities are both excluded from this topic, a significant portion of the Company’s revenues are not subject to the new guidance. The services that fall within the scope of FASB ASC 606 are presented within fee revenue and other income in the Consolidated Statements of Income and are recognized as revenue as the obligation to the customer is satisfied. Services within the scope of FASB ASC 606 include invoice processing and payment fees, bank service fees, and other real estate owned (“OREO”). In February 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-02 – Leases (ASC Topic 842). The ASU improves financial reporting about leasing transactions. The ASU affects all companies and other organizations that lease assets such as real estate, airplanes, and manufacturing equipment. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP—which requires only capital leases to be recognized on the balance sheet—the new ASU will require both types of leases to be recognized on the balance sheet. The ASU also will require disclosures to help investors and other financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. These disclosures include qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. The ASU on leases will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. A third-party vendor solution has been selected to assist in the application of ASU 2016-02. The Company will adopt this ASU using a prospective transition approach, which applies the provisions of the new guidance at the effective date without adjusting the comparative periods presented. The adoption of this ASU is expected to add assets and liabilities of approximately $9-11 million to the Company’s balance sheet. In June 2016, the FASB issued ASU No. 2016-13 - Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU requires measurement and recognition of expected credit losses for financial assets held. Under this standard, it will be required to hold an allowance equal to the expected life-of-loan losses on the loan portfolio. The standard is effective for fiscal periods beginning after December 15, 2019. The Company expects to recognize a one-time cumulative effect adjustment to the allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective, but cannot yet determine the magnitude of any such one-time adjustment or the overall impact of the new guidance on the consolidated financial statements.

Capital Requirements and Regulatory Restrictions (Tables)

12 Months Ended

Dec. 31, 2018

Regulatory Capital Requirements [Abstract]

Schedule of Capital Amounts and Ratios

The Company’s and the Bank’s actual and required capital amounts and ratios are as follows:

					Capital				Requirement to be
	Actual				Requirements				Well-Capitalized
(In thousands)	Amount Ratio				Amount Ratio				Amount Ratio
At December 31, 2018
Total capital (to risk-weighted assets)
Cass Information Systems, Inc.	$	244,660	21.38	%	$	91,550	8.00	%	$	N/A	N/A	%
Cass Commercial Bank		137,894	18.31			60,257	8.00			75,321	10.00
Common Equity Tier I Capital (to risk-weighted assets)
Cass Information Systems, Inc.		234,435	20.49			51,497	4.50			N/A	N/A
Cass Commercial Bank		130,037	17.26			33,895	4.50			48,959	6.50
Tier I capital (to risk-weighted assets)
Cass Information Systems, Inc.		234,435	20.49			68,662	6.00			N/A	N/A
Cass Commercial Bank		130,037	17.26			45,193	6.00			60,257	8.00
Tier I capital (to average assets)
Cass Information Systems, Inc.		234,435	13.89			67,500	4.00			N/A	N/A
Cass Commercial Bank		130,037	15.35			33,884	4.00			42,354	5.00
At December 31, 2017
Total capital (to risk-weighted assets)
Cass Information Systems, Inc.	$	234,389	22.53	%	$	83,233	8.00	%	$	N/A	N/A	%
Cass Commercial Bank		122,440	17.01			57,568	8.00			71,960	10.00
Common Equity Tier I Capital (to risk-weighted assets)
Cass Information Systems, Inc.		224,184	21.55			46,819	4.50			N/A	N/A
Cass Commercial Bank		114,603	15.93			32,382	4.50			46,774	6.50
Tier I capital (to risk-weighted assets)
Cass Information Systems, Inc.		224,184	21.55			62,425	6.00			N/A	N/A
Cass Commercial Bank		114,603	15.93			43,176	6.00			57,568	8.00
Tier I capital (to average assets)
Cass Information Systems, Inc.		224,184	13.87			64,649	4.00			N/A	N/A
Cass Commercial Bank		114,603	14.99			30,581	4.00			38,227	5.00

Investment in Securities (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities

The amortized cost, gross unrealized gains, gross unrealized losses and fair value of debt and equity securities are summarized as follows:

	December 31, 2018
			Gross		Gross
	Amortized		Unrealized		Unrealized
(In thousands)	Cost		Gains		Losses		Fair Value
State and political subdivisions	$	332,732	$	3,791	$	1,806	$	334,717
U.S. government agencies		106,153		86		1,417		104,822
Certificates of deposit		1,995		—		—		1,995
Total	$	440,880	$	3,877	$	3,223	$	441,534

	December 31, 2017
			Gross		Gross
	Amortized		Unrealized		Unrealized
(In thousands)	Cost		Gains		Losses		Fair Value
State and political subdivisions	$	408,165	$	9,528	$	661	$	417,032
U.S. government agencies		46,222		—		722		45,500
Certificates of deposit		7,991		—		—		7,991
Total	$	462,378	$	9,528	$	1,383	$	470,523

Schedule of Fair Value of Securities with Unrealized Losses

The fair values of securities with unrealized losses are as follows:

	December 31, 2018
	Less than 12 months				12 months or more				Total
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
(In thousands)	Fair Value		Losses		Fair Value		Losses		Fair value		Losses
State and political subdivisions	$	91,248	$	556	$	60,546	$	1,250	$	151,794	$	1,806
U.S. government agencies		30,409		130		38,005		1,287		68,414		1,417
Certificates of deposit		—		—		—		—		—		—
Total	$	121,657	$	686	$	98,551	$	2,537	$	220,208	$	3,223

	December 31, 2017
	Less than 12 months				12 months or more				Total
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
(In thousands)	Fair Value		Losses		Fair Value		Losses		Fair value		Losses
State and political subdivisions	$	34,755	$	123	$	31,251	$	538	$	66,006	$	661
U.S. government agencies		34,183		376		11,317		346		45,500		722
Certificates of deposit		—		—		—		—		—		—
Total	$	68,938	$	499	$	42,568	$	884	$	111,506	$	1,383

Schedule of Amortized Cost and Fair Value

	December 31, 2018
(In thousands)	Amortized Cost		Fair Value
Due in 1 year or less	$	7,956	$	7,987
Due after 1 year through 5 years		125,746		126,252
Due after 5 years through 10 years		242,119		244,118
Due after 10 years		65,059		63,177
No stated maturity		—		—
Total	$	440,880	$	441,534

Loans (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Summary of Loan Categories

A summary of loan categories is as follows:

	December 31,
(In thousands)	2018		2017
Commercial and industrial	$	277,091	$	236,394
Real estate
Commercial:
Mortgage		95,605		94,675
Construction		11,858		9,359
Faith-based:
Mortgage		316,147		316,073
Construction		20,576		25,948
Industrial Revenue Bonds		—		3,374
Other		310		408
Total loans	$	721,587	$	686,231

Schedule of the Aging Loans by Loan Categories

The following table presents the aging of loans by loan categories at December 31, 2018:

	Performing						Nonperforming
							90 Days
			30-59		60-89		and		Non-		Total
(In thousands)	Current		Days		Days		Over		accrual		Loans
Commercial and industrial	$	277,091	$	—	$	—	$	—	$	—	$	277,091
Real estate
Commercial:
Mortgage		95,605		—		—		—		—		95,605
Construction		11,858		—		—		—		—		11,858
Faith-based:
Mortgage		316,147		—		—		—		—		316,147
Construction		20,576		—		—		—		—		20,576
Industrial Revenue Bonds		—		—		—		—		—		—
Other		310		—		—		—		—		310
Total	$	721,587	$	—	$	—	$	—	$	—	$	721,587

The following table presents the aging of loans by loan categories at December 31, 2017:

	Performing						Nonperforming
							90 Days
			30-59		60-89		and		Non-		Total
(In thousands)	Current		Days		Days		Over		accrual		Loans
Commercial and industrial	$	236,394	$	—	$	—	$	—	$	—	$	236,394
Real estate
Commercial:
Mortgage		94,675		—		—		—		—		94,675
Construction		9,359		—		—		—		—		9,359
Faith-based:
Mortgage		316,073		—		—		—		—		316,073
Construction		25,948		—		—		—		—		25,948
Industrial Revenue Bonds		3,374		—		—		—		—		3,374
Other		408		—		—		—		—		408
Total	$	686,231	$	—	$	—	$	—	$	—	$	686,231

Schedule of Credit Exposure of the Loan Portfolio

The following table presents the credit exposure of the loan portfolio by internally assigned credit grade as of December 31, 2018:

	Loans		Performing		Nonperforming
	Subject to		Loans Subject to		Loans Subject
	Normal		Special		to Special
(In thousands)	Monitoring⁽¹⁾		Monitoring⁽²⁾		Monitoring⁽²⁾		Total Loans
Commercial and industrial	$	275,308	$	1,783	$	—	$	277,091
Real estate
Commercial:
Mortgage		95,447		158		—		95,605
Construction		11,858		—		—		11,858
Faith-based:
Mortgage		314,940		1,207		—		316,147
Construction		20,576		—		—		20,576
Industrial Revenue Bonds		—		—		—		—
Other		310		—		—		310
Total	$	718,439	$	3,148	$	—	$	721,587

⁽¹⁾	Loans subject to normal monitoring involve borrowers of acceptable-to-strong credit quality and risk, who have the apparent ability to satisfy their loan obligation.
⁽²⁾	Loans subject to special monitoring possess some credit deficiency or potential weakness which requires a high level of management attention.

The following table presents the credit exposure of the loan portfolio by internally assigned credit grade as of December 31, 2017:

	Loans		Performing		Nonperforming
	Subject to		Loans Subject to		Loans Subject
	Normal		Special		to Special
(In thousands)	Monitoring⁽¹⁾		Monitoring⁽²⁾		Monitoring⁽²⁾		Total Loans
Commercial and industrial	$	234,271	$	2,123	$	—	$	236,394
Real estate
Commercial:
Mortgage		93,788		887		—		94,675
Construction		9,359		—		—		9,359
Faith-based:
Mortgage		316,042		31		—		316,073
Construction		25,948		—		—		25,948
Industrial Revenue Bonds		3,374		—		—		3,374
Other		408		—		—		408
Total	$	683,190	$	3,041	$	—	$	686,231

⁽¹⁾	Loans subject to normal monitoring involve borrowers of acceptable-to-strong credit quality and risk, who have the apparent ability to satisfy their loan obligation.
⁽²⁾	Loans subject to special monitoring possess some credit deficiency or potential weakness which requires a high level of management attention.

Summary of the Allowance for Loan Losses

A summary of the activity in the allowance for loan losses for the period ended December 31, 2018 is as follows:

	December 31,		Charge-							December 31,
(In thousands)	2017		Offs		Recoveries		Provision			2018
Commercial and industrial	$	3,652	$	—	$	20	$	507		$	4,179
Real estate
Commercial:
Mortgage		1,394		—		—		23			1,417
Construction		70		—		—		19			89
Faith-based:
Mortgage		3,962		—		—		(1	)		3,961
Construction		196		—		—		(41	)		155
Industrial Revenue Bond		52		—		—		(52	)		—
Other		879		—		—		(455	)		424
Total	$	10,205	$	—	$	20	$	—		$	10,225

A summary of the activity in the allowance for loan losses for the period ended December 31, 2017 is as follows:

	December 31,		Charge-							December 31,
(In thousands)	2016		Offs		Recoveries		Provision			2017
Commercial and industrial	$	3,261	$	—	$	30	$	361		$	3,652
Real estate
Commercial:
Mortgage		1,662		—		—		(268	)		1,394
Construction		47		—		—		23			70
Faith-based:
Mortgage		4,027		—		—		(65	)		3,962
Construction		85		—		—		111			196
Industrial Revenue Bond		101		—		—		(49	)		52
Other		992		—		—		(113	)		879
Total	$	10,175	$	—	$	30	$	—		$	10,205

Premises and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Summary of Premises and Equipment

A summary of premises and equipment is as follows:

	December 31,
(In thousands)	2018		2017
Land	$	873	$	873
Buildings		14,684		13,386
Leasehold improvements		2,537		2,120
Furniture, fixtures and equipment		16,332		14,801
Purchased software		5,043		4,819
Internally developed software		17,428		16,485
		56,897		52,484
Less accumulated depreciation		34,866		30,898
Total	$	22,031	$	21,586

Schedule of Future Minimum Rental Payments for Operating Leases

(In thousands)	Amount
2019		1,639
2020		1,902
2021		1,769
2022		1,646
2023		724
2024+		3,040
Total	$	10,720

Interest-Bearing Deposits (Tables)

12 Months Ended

Dec. 31, 2018

Interest-Bearing Deposits [Abstract]

Schedule of Interest Bearing Deposits

Interest-bearing deposits consist of the following:

	December 31,
(In thousands)	2018			2017
Interest-bearing demand deposits	$	322,709		$	332,881
Savings deposits		13,502			11,168
Time deposits:
Less than $100		4,862			2,658
$100 to less than $250		51,658			33,385
$250 or more		15,937			16,455
Total	$	408,668		$	396,547
Weighted average interest rate		1.00	%		.56	%

Schedule of Interest on Deposits

Interest on deposits consists of the following:

	December 31,
(In thousands)	2018		2017		2016
Interest-bearing demand deposits	$	2,832	$	1,611	$	1,387
Savings deposits		109		79		100
Time deposits:
Less than $100		433		234		274
$100 to less than $250		152		114		191
$250 or more		210		149		77
Total	$	3,736	$	2,187	$	2,029

Schedule of Maturities of Time Deposits

The scheduled maturities of time deposits are summarized as follows:

	December 31,
	2018				2017
			Percent				Percent
(In thousands)	Amount		of Total		Amount		of Total
Due within:
One year	$	51,154	70.6	%	$	48,370	92.1	%
Two years		18,262	25.2			281	0.5
Three years		140	0.2			2,383	4.5
Four years		983	1.4			25	0.1
Five years		1,918	2.6			1,439	2.8
Total	$	72,457	100.0	%	$	52,498	100.0	%

Common Stock and Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Common Stock Outstanding

The table below shows activity in the outstanding shares of the Company’s common stock during 2018.

	2018
Shares outstanding at January 1	12,286,896
20% stock dividend paid on December 14, 2018	2,457,484
Issuance of common stock:
Employee restricted stock grants	9,530
Employee SARs exercised	12,048
Directors’ compensation	9,526
Shares repurchased	(163,634	)
Shares forfeited	(564	)
Shares outstanding at December 31	14,611,286

Schedule of the Calculations of Basic and Diluted Earnings per Share

The calculations of basic and diluted earnings per share are as follows:

	December 31,
(In thousands except share and per share data)	2018		2017		2016
Basic:
Net income	$	30,268	$	25,014	$	24,348
Weighted average common shares outstanding		14,675,136		14,700,557		14,718,228
Basic earnings per share	$	2.06	$	1.70	$	1.65
Diluted:
Net income	$	30,268	$	25,014	$	24,348
Weighted average common shares outstanding		14,675,136		14,700,558		14,718,228
Effect of dilutive restricted stock, performance based restricted stock (“PBRS”), and SARs		239,065		215,332		206,878
Weighted average common shares outstanding assuming dilution		14,914,202		14,915,890		14,925,106
Diluted earnings per share	$	2.03	$	1.68	$	1.63

Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Projected Benefit Obligation

A summary of the activity in the Plan’s projected benefit obligation, assets, funded status and amounts recognized in the Company’s consolidated balance sheets is as follows:

(In thousands)	2018			2017
Projected benefit obligation:
Balance, January 1	$	98,790		$	85,551
Service cost		4,017			3,733
Interest cost		3,703			3,621
Actuarial (gain) loss		(7,768	)		7,916
Benefits paid		(2,341	)		(2,031	)
Balance, December 31	$	96,401		$	98,790
Plan assets:
Fair value, January 1	$	81,427		$	73,168
Actual return		(4,506	)		10,290
Employer contribution		—			—
Benefits paid		(2,341	)		(2,031	)
Fair value, December 31	$	74,580		$	81,427
Funded status:
Accrued pension liability	$	(21,821	)	$	(17,363	)

Schedule of Assumptions used to Determine Projected Benefit Obligation

	2018		2017		2016
Weighted average discount rate	4.30	%	3.75	%	4.25	%
Rate of increase in compensation levels	(a)		(a)		(a)

(a)	6.0% graded down to 3.25% over the first seven years of service.

Schedule of Expected Pension Benefit Payments

The following pension benefit payments, which reflect expected future service, as appropriate, are expected to be paid by the Plan:

	Amount
2019	$	2,893,000
2020		3,099,000
2021		3,363,000
2022		3,769,000
2023		4,196,000
2024-2028		25,643,000

Schedule of Plan's Pension Costs

The Plan’s pension cost included the following components:

	For the Year Ended
	December 31,
(In thousands)	2018			2017			2016
Service cost – benefits earned during the year	$	4,017		$	3,733		$	3,559
Interest cost on projected benefit obligations		3,703			3,621			3,505
Expected return on plan assets		(5,202	)		(4,681	)		(4,734	)
Net amortization and deferral		1,522			1,382			1,259
Net periodic pension cost	$	4,040		$	4,055		$	3,589

Schedule of Assumptions used to Determine Net Pension Cost

The following represent the major assumptions used to determine the net pension cost of the Plan:

	2018		2017		2016
Weighted average discount rate	3.75	%	4.25	%	4.50	%
Rate of increase in compensation levels	(a	)	(a	)	(a	)
Expected long-term rate of return on assets	6.50	%	6.50	%	6.75	%

(a)	6.0% graded down to 3.25% over the first seven years of service

Schedule of Assumed Long-term Rate of Return on Assets

The expected one-year nominal returns and annual standard deviations are shown by asset class below:

			One-Year Nominal		Annual Standard
Asset Class	% of Total Portfolio		Return		Deviation
Core Fixed Income	51	%	4.44	%	3.90	%
Large Cap U.S. Equities	14	%	7.02	%	15.10	%
Small Cap U.S. Equities	5	%	8.04	%	18.75	%
International (Developed)	25	%	8.19	%	17.36	%
International (Emerging)	5	%	10.45	%	25.35	%

Summary of the Fair Value Measurements by Type of Asset

A summary of the fair value measurements by type of asset is as follows:

	Fair Value Measurements as of December 31,
	2018						2017
			Quoted Prices						Quoted Prices
			in Active						in Active
			Markets for		Significant				Markets for		Significant
			Identical		Observable				Identical		Observable
			Assets		Inputs				Assets		Inputs
(In thousands)	Total		(Level 1)		(Level 2)		Total		(Level 1)		(Level 2)
Cash	$	423	$	423	$	—	$	374	$	374	$	—
Equity securities
U.S. Small/Mid Cap Growth		3,405		—		3,405		4,111		—		4,111
Non-U. S. Core		18,398		—		18,398		21,065		—		21,065
U.S. Large Cap Passive		10,471		—		10,471		11,717		—		11,717
Emerging Markets		3,217		—		3,217		4,052		—		4,052
Fixed Income
U.S. Core		10,609		—		10,609		11,284		—		11,284
U.S. Passive		23,827		—		23,827		24,345		—		24,345
Opportunistic		4,230		—		4,230		4,479		—		4,479
Total	$	74,580	$	423	$	74,157	$	81,427	$	374	$	81,053

Supplemental Executive Retirement Plan [Member]

Summary of Projected Benefit Obligation

A summary of the activity in the SERP’s projected benefit obligation, funded status and amounts recognized in the Company’s consolidated balance sheets is as follows:

	December 31,
(In thousands)	2018			2017
Benefit obligation:
Balance, January 1	$	10,094		$	9,132
Service cost		92			143
Interest cost		348			360
Benefits paid		(260	)		(247	)
Actuarial (gain) loss		(177	)		706
Balance, December 31	$	10,097		$	10,094

Schedule of Assumptions used to Determine Projected Benefit Obligation

	2018		2017		2016
Weighted average discount rate	4.10	%	3.50	%	4.00	%
Rate of increase in compensation levels	(a)		(a)		(a)

(a)	6.00% graded down to 3.25% over the first seven years of service.

Schedule of Expected Pension Benefit Payments

Expected future benefits payable by the Company over the next ten years are as follows:

	Amount
2019	$	313,000
2020		312,000
2021		372,000
2022		749,000
2023		817,000
2024-2028		4,014,000

Schedule of Plan's Pension Costs

The SERP’s pension cost included the following components:

	For the Year Ended December 31,
(In thousands)	2018		2017		2016
Service cost – benefits earned during the year	$	92	$	143	$	133
Interest cost on projected benefit obligations		348		360		367
Net amortization and deferral		581		324		295
Net periodic pension cost	$	1,021	$	827	$	795

Schedule of Pretax Amounts in Accumulated Other Comprehensive Loss

The pretax amounts in accumulated other comprehensive loss as of December 31 were as follows:

	The Plan				SERP
(In thousands)	2018		2017		2018		2017
Prior service cost	$	—	$	—	$	—	$	—
Net actuarial loss		23,580		23,160		1,629		2,388
Total	$	23,580	$	23,160	$	1,629	$	2,388

Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Restricted Stock Activity

Changes in restricted shares outstanding for the year ended December 31, 2018 were as follows:

			Weighted Average
			Grant Date
	Shares		Fair Value
Balance at December 31, 2017	93,775		$41.92
Granted	35,000		49.79
Vested	(28,487	)	39.03
Forfeited	(564	)	46.70
Balance at December 31, 2018	99,724		$45.48

Schedule of SARs Activity

Changes in SARs outstanding for the year ended December 31, 2018 were as follows:

	SARs		Weighted Average Exercise Price
Balance at December 31, 2017	281,067			$29.14
Exercised	(43,946	)		25.26
Forfeited	—			—
Balance at December 31, 2018	237,121			29.86
Exercisable at December 31, 2018	237,121			$29.86

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The components of income tax expense are as follows:

	For the Years Ended December 31,
(In thousands)		2018			2017			2016
Current:
Federal	$	8,557		$	4,250		$	6,456
State		1,043			1,638			941
Deferred:
Federal		(3,404	)		4,256			301
State		(117	)		(259	)		18
Total income tax expense	$	6,079		$	9,885		$	7,716

Schedule of Reconciliation of Expected Income Tax Expense (Benefit)

	For the Years Ended December 31,
(In thousands)		2018			2017			2016
Expected income tax expense	$	7,633		$	12,214		$	11,223
(Reductions) increases resulting from:
Tax-exempt income		(2,009	)		(3,868	)		(3,754	)
State taxes, net of federal benefit		732			896			623
Share-based compensation adjustment		(286	)		(376	)		—
Adjustment of deferred tax asset or liability for TCJA		(74	)		1,824			—
Other, net		83			(805	)		(376	)
Total income tax expense	$	6,079		$	9,885		$	7,716

Schedule of Deferred Assets and Liabilities

The tax effects of temporary differences which give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below:

	December 31,
(In thousands)		2018			2017
Deferred tax assets:
Allowance for loan losses	$	2,376		$	2,413
ASC 715 pension funding liability		6,000			6,080
Net operating loss carryforward ⁽¹⁾		50			76
Supplemental executive retirement plan accrual		1,968			1,833
Stock compensation		1,673			1,307
Other		—			118
Total deferred tax assets	$	12,067		$	11,827
Deferred tax liabilities:
Premises and equipment		(1,937	)		(2,248	)
Pension		(409	)		(1,379	)
Intangible assets		(1,212	)		(1,091	)
Unrealized gain on investment in securities available-for-sale		(156	)		(1,938	)
Deferred income		—			(2,121	)
Other		(80	)		—
Total deferred tax liabilities	$	(3,794	)	$	(8,777	)
Net deferred tax assets	$	8,273		$	3,050

⁽¹⁾

Schedule of the Reconciliation of Unrecognized Tax Benefits

The reconciliation of the beginning unrecognized tax benefits balance to the ending balance is presented in the following table:

(In thousands)	2018			2017			2016
Balance at January 1	$	1,632		$	1,623		$	1,194
Changes in unrecognized tax benefits as a result of tax positions taken during a prior year		(135	)		(15	)		407
Changes in unrecognized tax benefits as a result of tax position taken during the current year		192			263			311
Decreases in unrecognized tax benefits relating to settlements with taxing authorities		—			—			—
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations		(286	)		(239	)		(289	)
Balance at December 31	$	1,403		$	1,632		$	1,623

Disclosures about Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Commitments to Extend Credit, Standby Letters of Credit and Commercial Letters

The following table shows conditional commitments to extend credit, standby letters of credit and commercial letters:

	December 31,
(In thousands)		2018		2017
Conditional commitments to extend credit		$	144,010	$	87,013
Standby letters of credit			11,368		14,347
Commercial letters of credit			3,486		3,246

Schedule of Company's Financial Instruments

Following is a summary of the carrying amounts and fair values of the Company’s financial instruments:

	December 31,
	2018				2017
	Carrying				Carrying
(In thousands)	Amount		Fair Value		Amount		Fair Value
Balance sheet assets:
Cash and cash equivalents	$	230,933	$	230,933	$	228,110	$	228,110
Investment in securities		441,534		441,534		470,523		470,523
Loans, net		711,362		711,090		676,026		675,020
Accrued interest receivable		7,069		7,069		7,413		7,413
Total	$	1,390,898	$	1,390,626	$	1,382,072	$	1,381,066

Balance sheet liabilities:
Deposits	$	721,926	$	722,018	$	678,088	$	678,346
Accounts and drafts payable		694,360		694,360		661,888		661,888
Accrued interest payable		91		91		55		55
Total	$	1,416,377	$	1,416,469	$	1,340,031	$	1,340,289

Industry Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Summary of Segment Information

Summarized information about the Company’s operations in each industry segment for the years ended December 31, 2018, 2017 and 2016, is as follows:

						Corporate,
		Information		Banking		Eliminations
*(In thousands)*		Services		Services		and Other			Total
*2018*
Fee income from customers	$	102,839	$	1,307	$	(70	)	$	104,076
Interest income*		22,273		23,706		4,369			50,348
Interest expense		—		3,736		—			3,736
Intersegment income (expense)		—		1,880		(1,880	)		—
Depreciation and amortization		4,254		142		—			4,396
Tax-equivalized pre-tax income*		24,962		11,625		2,181			38,768
Goodwill		12,433		136		—			12,569
Other intangible assets, net		1,554		—		—			1,554
Total Assets		826,201		886,291		(17,316	)		1,695,176

Funding Sources		642,733		572,653		—			1,215,386
*2017*
Fee income from customers	$	93,484	$	1,547	$	481		$	95,512
Interest income*		20,634		23,732		3,301			47,667
Interest expense		—		2,187		—			2,187
Intersegment income (expense)		—		1,362		(1,362	)		—
Depreciation and amortization		3,902		149		—			4,051
Tax-equivalized pre-tax income*		24,990		13,691		1,908			40,589
Goodwill		12,433		136		—			12,569
Other intangible assets, net		1,996		—		—			1,996
Total Assets		854,214		830,672		(27,677	)		1,603,209
Funding Sources		604,493		598,986		—			1,203,479
*2016*
Fee income from customers	$	83,821	$	1,417	$	898		$	86,136
Interest income*		18,729		24,088		2,614			45,431
Interest expense		—		2,029		—			2,029
Intersegment income (expense)		—		1,136		(1,136	)		—
Depreciation and amortization		3,488		165		—			3,653
Tax-equivalized pre-tax income*		20,065		15,090		2,410			37,565
Goodwill		11,454		136		—			11,590
Other intangible assets, net		1,997		—		—			1,997
Total Assets		763,999		756,164		(15,324	)		1,504,839
Funding Sources		545,726		614,974		—			1,160,700

*	Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.

Condensed Financial Information of Parent Company (Tables)

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Schedule of Condensed Balance Sheet

Following are the condensed balance sheets of the Company (parent company only) and the related condensed statements of income and cash flows.

	Condensed Balance Sheets
	December 31,
(In thousands)	2018		2017
Assets
Cash and due from banks	$	35,735	$	56,462
Short-term investments		35,201		48,324
Securities available-for-sale, at fair value		441,534		470,523
Loans, net		20,188		12,239
Investments in subsidiaries		130,231		113,681
Premises and equipment, net		21,358		20,927
Other assets		278,151		199,865
Total assets	$	962,398	$	922,021
Liabilities and Shareholders’ Equity
Liabilities:
Accounts and drafts payable	$	693,026	$	661,342
Other liabilities		39,362		35,533
Total liabilities		732,388		696,875
Total shareholders’ equity		230,010		225,146
Total liabilities and shareholders’ equity	$	962,398	$	922,021

Schedule of Condensed Statements of Income

	Condensed Statements of Income
	For the Years Ended December 31,
(In thousands)	2018			2017		2016
Income from subsidiaries:
Interest	$	—		$	—	$	2
Management fees		2,668			2,172		2,105
Income from subsidiaries		2,668			2,172		2,107
Information services revenue		100,628			93,133		83,543
Net interest income after provision		14,159			13,217		13,389
(Loss) Gain on sales of investment securities		(42	)		—		387
Other income		456			483		504
Total income		117,869			109,005		99,930
Expenses:
Salaries and employee benefits		77,946			70,409		65,968
Other expenses		23,442			20,333		18,133
Total expenses		101,388			90,742		84,101
Income before income tax and equity in undistributed
income of subsidiaries		16,481			18,263		15,829
Income tax expense		1,788			4,394		1,540
Income before undistributed income of subsidiaries		14,693			13,869		14,289
Equity in undistributed income of subsidiaries		15,575			11,145		10,059
Net income	$	30,268		$	25,014	$	24,348

Schedule of Condensed Statements of Cash Flows

	Condensed Statements of Cash Flows
	For the Years Ended December 31,
(In thousands)	2018			2017			2016
Cash flows from operating activities:
Net income	$	30,268		$	25,014		$	24,348
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Equity in undistributed income of subsidiaries		(15,575	)		(11,145	)		(10,059	)
Net change in other assets		(76,686	)		(41,013	)		(7,085	)
Net change in other liabilities		3,829			10,118			6,683
Amortization of stock-based awards		2,583			1,743			1,677
Other, net		10,242			9,219			7,558
Net cash provided by (used in) operating activities		(45,339	)		(6,064	)		23,122
Cash flows from investing activities:
Net decrease (increase) in securities		14,615			(80,621	)		(33,025	)
Net (increase) decrease in loans		(7,949	)		34,944			40,431
Purchases of premises and equipment, net		(4,211	)		(4,020	)		(4,557	)
Net cash (used in) provided by investing activities		2,455			(49,697	)		2,849
Cash flows from financing activities:
Net increase in accounts and drafts payable		31,684			20,397			64,026
Cash dividends paid		(13,177	)		(10,675	)		(9,979	)
Purchase of common shares for treasury		(8,838	)		(2,270	)		(9,215	)
Other financing activities		(635	)		(267	)		1,705
Net cash provided by financing activities		9,034			7,185			46,537
Net (decrease) increase in cash and cash equivalents		(33,850	)		(48,576	)		72,508
Cash and cash equivalents at beginning of year		104,786			153,362			80,854
Cash and cash equivalents at end of year	$	70,936		$	104,786		$	153,362

SUPPLEMENTARY FINANCIAL INFORMATION (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Income Statement Elements [Abstract]

Schedule of Quarterly Financial Information

	First		Second		Third		Fourth
(In thousands except per share data)	Quarter		Quarter		Quarter		Quarter			YTD
*2018*
Fee revenue and other income	$	25,374	$	25,640	$	26,435	$	26,627		$	104,076
Interest income		11,288		11,513		12,215		12,910			47,926
Interest expense		679		794		1,029		1,234			3,736
Net interest income		10,609		10,719		11,186		11,676			44,190
Provision for loan losses		—		—		—		—			—
Operating expense		26,182		27,463		28,530		29,744			111,919
Income tax expense		1,709		1,387		1,481		1,502			6,079
Net income	$	8,092	$	7,509	$	7,610	$	7,057		$	30,268
Net income per share:
Basic earnings per share	$	.55	$	.51	$	.52	$	.48		$	2.06
Diluted earnings per share		.54		.50		.51		.47			2.03
*2017*
Fee revenue and other income	$	22,771	$	23,800	$	24,207	$	24,734		$	95,512
Interest income		9,999		10,332		10,665		10,981			41,977
Interest expense		480		470		571		666			2,187
Net interest income		9,519		9,862		10,094		10,315			39,790
Provision for loan losses		—		—		—		—			—
Operating expense		24,318		24,901		25,042		26,142			100,403
Income tax expense		1,665		2,248		2,396		3,576	⁽¹⁾		9,885	⁽¹⁾
Net income	$	6,307	$	6,513	$	6,863	$	5,331		$	25,014
Net income per share:
Basic earnings per share	$	.43	$	.44	$	.47	$	.36		$	1.70
Diluted earnings per share		.42		.44		.46		.36			1.68

⁽¹⁾	Includes one-time, non-cash TCJA charge of $1,824,000

Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 14, 2018	Dec. 31, 2018
Percentage holding required to account investments under non-marketable equity investments		20.00%
Percentage of dividend	20.00%
Maximum [Member]
Range of total assets and liabilities expected to be added to balance sheet from adoption of ASU No. 2016-02 - Leases		$ 11,000
Minimum [Member]
Range of total assets and liabilities expected to be added to balance sheet from adoption of ASU No. 2016-02 - Leases		$ 9,000
Building [Member] \| Maximum [Member]
Estimated useful lives		40 years
Leasehold Improvements [Member] \| Minimum [Member]
Estimated useful lives		10 years
Software, Equipment, Furniture and Fixtures [Member] \| Maximum [Member]
Estimated useful lives		7 years
Software, Equipment, Furniture and Fixtures [Member] \| Minimum [Member]
Estimated useful lives		3 years

Capital Requirements and Regulatory Restrictions (Schedule of Capital Amounts and Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cass Information Systems Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), actual amount	$ 244,660	$ 234,389
Common Equity Tier I Capital (to risk-weighted assets), actual amount	234,435	224,184
Tier I capital (to risk-weighted assets), actual amount	234,435	224,184
Tier I capital (to average assets), actual amount	$ 234,435	$ 224,184
Total capital (to risk-weighted assets), actual ratio	21.38%	22.53%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio	20.49%	21.55%
Tier I capital (to risk-weighted assets), actual ratio	20.49%	21.55%
Tier I capital (to average assets), actual ratio	13.89%	13.87%
Total capital (to risk-weighted assets), capital requirements amount	$ 91,550	$ 83,233
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount	51,497	46,819
Tier I capital (to risk-weighted assets), capital requirements amount	68,662	62,425
Tier I capital (to average assets), capital requirements amount	$ 67,500	$ 64,649
Total capital (to risk-weighted assets), capital requirements ratio	8.00%	8.00%
Common Equity Tier I Capital (to risk-weighted assets), capital requirements ratio	4.50%	4.50%
Tier I capital (to risk-weighted assets), capital requirements ratio	6.00%	6.00%
Tier I capital (to average assets), capital requirements ratio	4.00%	4.00%
Cass Commercial Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk-weighted assets), actual amount	$ 137,894	$ 122,440
Common Equity Tier I Capital (to risk-weighted assets), actual amount	130,037	114,603
Tier I capital (to risk-weighted assets), actual amount	130,037	114,603
Tier I capital (to average assets), actual amount	$ 130,037	$ 114,603
Total capital (to risk-weighted assets), actual ratio	18.31%	17.01%
Common Equity Tier I Capital (to risk-weighted assets), actual ratio	17.26%	15.93%
Tier I capital (to risk-weighted assets), actual ratio	17.26%	15.93%
Tier I capital (to average assets), actual ratio	15.35%	14.99%
Total capital (to risk-weighted assets), capital requirements amount	$ 60,257	$ 57,568
Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount	33,895	32,382
Tier I capital (to risk-weighted assets), capital requirements amount	45,193	43,176
Tier I capital (to average assets), capital requirements amount	$ 33,884	$ 30,581
Total capital (to risk-weighted assets), capital requirements ratio	8.00%	8.00%
Common Equity Tier I Capital (to risk-weighted assets), capital requirements ratio	4.50%	4.50%
Tier I capital (to risk-weighted assets), capital requirements ratio	6.00%	6.00%
Tier I capital (to average assets), capital requirements ratio	4.00%	4.00%
Total capital (to risk-weighted assets), requirement to be well capitalized amount	$ 75,321	$ 71,960
Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized amount	48,959	46,774
Tier I capital (to risk-weighted assets), requirement to be well capitalized amount	60,257	57,568
Tier I capital (to average assets), requirement to be well capitalized amount	$ 42,354	$ 38,227
Total capital (to risk-weighted assets), requirement to be well capitalized ratio	10.00%	10.00%
Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized ratio	6.50%	6.50%
Tier I capital (to risk-weighted assets), requirement to be well capitalized ratio	8.00%	8.00%
Tier I capital (to average assets), requirement to be well capitalized ratio	5.00%	5.00%

Investment in Securities (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract]
Number of securities that had an unrealized loss	136	64
Number of securities that had an unrealized loss, greater than 12 months	61	24
Percentage of total securities	43.00%	17.00%
Premium related to purchase of state and political subdivisions	$ 6,857	$ 7,147
Securities pledged as collateral	0	3,750
Proceeds from sales of securities available-for-sale	58,520		$ 21,491
Gross realized gains	180	0	387
Gross realized losses	$ 222	$ 0	$ 0

Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Fair Value	$ 441,534	$ 470,523
Gross Unrealized Gains	3,877	9,528
Gross Unrealized Losses	3,223	1,383
Amortized Cost	440,880	462,378
State and Political Subdivisions [Member]
Investment [Line Items]
Fair Value	334,717	417,032
Gross Unrealized Gains	3,791	9,528
Gross Unrealized Losses	1,806	661
Amortized Cost	332,732	408,165
U.S. government agencies [Member]
Investment [Line Items]
Fair Value	104,822	45,500
Gross Unrealized Gains	86
Gross Unrealized Losses	1,417	722
Amortized Cost	106,153	46,222
Certificates of Deposit [Member]
Investment [Line Items]
Fair Value	1,995	7,991
Gross Unrealized Gains
Gross Unrealized Losses
Amortized Cost	$ 1,995	$ 7,991

Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Estimated fair value less than 12 months	$ 121,657	$ 68,938
Estimated fair value 12 months or more	98,551	42,568
Estimated fair value total	220,208	111,506
Unrealized losses, less than 12 months	686	499
Unrealized losses, 12 months or more	2,537	884
Unrealized losses, total	3,223	1,383
State and Political Subdivisions [Member]
Investment [Line Items]
Estimated fair value less than 12 months	91,248	34,755
Estimated fair value 12 months or more	60,546	31,251
Estimated fair value total	151,794	66,006
Unrealized losses, less than 12 months	556	123
Unrealized losses, 12 months or more	1,250	538
Unrealized losses, total	1,806	661
U.S. government agencies [Member]
Investment [Line Items]
Estimated fair value less than 12 months	30,409	34,183
Estimated fair value 12 months or more	38,005	11,317
Estimated fair value total	68,414	45,500
Unrealized losses, less than 12 months	130	376
Unrealized losses, 12 months or more	1,287	346
Unrealized losses, total	1,417	722
Certificates of Deposit [Member]
Investment [Line Items]
Estimated fair value less than 12 months
Estimated fair value 12 months or more
Estimated fair value total
Unrealized losses, less than 12 months
Unrealized losses, 12 months or more
Unrealized losses, total

Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in 1 year or less	$ 7,956
Amortized Cost, Due after 1 year through 5 years	125,746
Amortized Cost, Due after 5 years through 10 years	242,119
Amortized Cost, Due after 10 years	65,059
Amortized Cost, No stated maturity
Amortized Cost, Total	440,880
Fair Value, Due in 1 year or less	7,987
Fair Value, Due after 1 year through 5 years	126,252
Fair Value, Due after 5 years through 10 years	244,118
Fair Value, Due after 10 years	63,177
Fair Value, No stated maturity
Available-for-sale Securities, Total	$ 441,534	$ 470,523

Loans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Loans (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Impaired loans, ALLL	$ 0	$ 0
Nonaccrual loans	0	0
Delinquent loans still accruing interest	0	0
Loans classified as troubled debt restructuring	0	0
Average balance of impaired loans	0	166	$ 333
Income recognized on nonaccrual loans under original terms of contract	0	24	66
Income recognized on nonaccrual loans	0	17	$ 47
Loans to affiliates	$ 278,153	$ 0

Loans (Summary of Loan Categories) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 721,587	$ 686,231
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	277,091	236,394
Real Estate Commercial Mortgage [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	95,605	94,675
Real Estate Commercial Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	11,858	9,359
Real Estate Faith based Mortgage [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	316,147	316,073
Real Estate Faith-based Construction [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	20,576	25,948
Industrial Revenue Bonds [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans		3,374
Other Loan [Member]
Loans and Leases Receivable Disclosure [Line Items]
Total Loans	$ 310	$ 408

Loans (Schedule of the Aging of Loans by Loan Categories) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual
Total Loans	721,587	686,231
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual
Total Loans	277,091	236,394
Real Estate Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual
Total Loans	95,605	94,675
Real Estate Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual
Total Loans	11,858	9,359
Real Estate Faith based Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual
Total Loans	316,147	316,073
Real Estate Faith-based Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual
Total Loans	20,576	25,948
Industrial Revenue Bonds [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual
Total Loans		3,374
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non Accrual
Total Loans	310	408
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	721,587	686,231
Current [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	277,091	236,394
Current [Member] \| Real Estate Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	95,605	94,675
Current [Member] \| Real Estate Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	11,858	9,359
Current [Member] \| Real Estate Faith based Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	316,147	316,073
Current [Member] \| Real Estate Faith-based Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	20,576	25,948
Current [Member] \| Industrial Revenue Bonds [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans		3,374
Current [Member] \| Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	310	408
30-59 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
30-59 Days [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
30-59 Days [Member] \| Real Estate Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
30-59 Days [Member] \| Real Estate Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
30-59 Days [Member] \| Real Estate Faith based Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
30-59 Days [Member] \| Real Estate Faith-based Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
30-59 Days [Member] \| Industrial Revenue Bonds [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
30-59 Days [Member] \| Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
60-89 Days [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
60-89 Days [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
60-89 Days [Member] \| Real Estate Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
60-89 Days [Member] \| Real Estate Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
60-89 Days [Member] \| Real Estate Faith based Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
60-89 Days [Member] \| Real Estate Faith-based Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
60-89 Days [Member] \| Industrial Revenue Bonds [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
60-89 Days [Member] \| Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
90 Days and over [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
90 Days and over [Member] \| Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
90 Days and over [Member] \| Real Estate Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
90 Days and over [Member] \| Real Estate Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
90 Days and over [Member] \| Real Estate Faith based Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
90 Days and over [Member] \| Real Estate Faith-based Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
90 Days and over [Member] \| Industrial Revenue Bonds [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans
90 Days and over [Member] \| Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans

Loans (Schedule of the Credit Exposure of the Loan Portfolio) (Details) - USD ($)
$ in Thousands

Dec. 31, 2018

Dec. 31, 2017

Financing Receivable, Recorded Investment [Line Items]

Loans Subject To Normal Monitoring [Member]

$ 721,587

$ 686,231

Financing Receivable, Recorded Investment [Line Items]

Performing Loans Subject To Special Monitoring [Member]

^[1]

718,439

683,190

Financing Receivable, Recorded Investment [Line Items]

Nonperforming Loans Subject To Special Monitoring [Member]

^[2]

3,148

3,041

Financing Receivable, Recorded Investment [Line Items]

Commercial and Industrial [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Commercial and Industrial [Member] | Loans Subject To Normal Monitoring [Member]

277,091

236,394

Financing Receivable, Recorded Investment [Line Items]

Commercial and Industrial [Member] | Performing Loans Subject To Special Monitoring [Member]

^[1]

275,308

234,271

Financing Receivable, Recorded Investment [Line Items]

Commercial and Industrial [Member] | Nonperforming Loans Subject To Special Monitoring [Member]

^[2]

1,783

2,123

Financing Receivable, Recorded Investment [Line Items]

Real Estate Commercial Mortgage [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Real Estate Commercial Mortgage [Member] | Loans Subject To Normal Monitoring [Member]

95,605

94,675

Financing Receivable, Recorded Investment [Line Items]

Real Estate Commercial Mortgage [Member] | Performing Loans Subject To Special Monitoring [Member]

^[1]

95,447

93,788

Financing Receivable, Recorded Investment [Line Items]

Real Estate Commercial Mortgage [Member] | Nonperforming Loans Subject To Special Monitoring [Member]

^[2]

158

887

Financing Receivable, Recorded Investment [Line Items]

Real Estate Commercial Construction [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Real Estate Commercial Construction [Member] | Loans Subject To Normal Monitoring [Member]

11,858

9,359

Financing Receivable, Recorded Investment [Line Items]

Real Estate Commercial Construction [Member] | Nonperforming Loans Subject To Special Monitoring [Member]

^[1]

11,858

9,359

Financing Receivable, Recorded Investment [Line Items]

Real Estate Church Related Construction [Member] | Performing Loans Subject To Special Monitoring [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Real Estate Faith based Mortgage [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Real Estate Faith based Mortgage [Member] | Loans Subject To Normal Monitoring [Member]

316,147

316,073

Financing Receivable, Recorded Investment [Line Items]

Real Estate Faith based Mortgage [Member] | Performing Loans Subject To Special Monitoring [Member]

^[1]

314,940

316,042

Financing Receivable, Recorded Investment [Line Items]

Real Estate Faith based Mortgage [Member] | Nonperforming Loans Subject To Special Monitoring [Member]

^[2]

1,207

Financing Receivable, Recorded Investment [Line Items]

Real Estate Faith-based Construction [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Real Estate Faith-based Construction [Member] | Loans Subject To Normal Monitoring [Member]

20,576

25,948

Financing Receivable, Recorded Investment [Line Items]

Real Estate Faith-based Construction [Member] | Performing Loans Subject To Special Monitoring [Member]

^[1]

20,576

25,948

Financing Receivable, Recorded Investment [Line Items]

Real Estate Faith-based Construction [Member] | Nonperforming Loans Subject To Special Monitoring [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Industrial Revenue Bonds [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Industrial Revenue Bonds [Member] | Loans Subject To Normal Monitoring [Member]

3,374

Financing Receivable, Recorded Investment [Line Items]

Industrial Revenue Bonds [Member] | Performing Loans Subject To Special Monitoring [Member]

^[1]

3,374

Financing Receivable, Recorded Investment [Line Items]

Industrial Revenue Bonds [Member] | Nonperforming Loans Subject To Special Monitoring [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

Financing Receivable, Recorded Investment [Line Items]

^[2]

Other [Member]

Other [Member] | Loans Subject To Normal Monitoring [Member]

310

408

Financing Receivable, Recorded Investment [Line Items]

Other [Member] | Performing Loans Subject To Special Monitoring [Member]

^[1]

310

408

Financing Receivable, Recorded Investment [Line Items]

Other [Member] | Nonperforming Loans Subject To Special Monitoring [Member]

^[2]

Financing Receivable, Recorded Investment [Line Items]

^[2]

[1]	Loans subject to normal monitoring involve borrowers of acceptable-to-strong credit quality and risk, who have the apparent ability to satisfy their loan obligation.
[2]	Loans subject to special monitoring possess some credit deficiency or potential weakness which requires a high level of management attention.

Loans (Summary of Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning Balance	$ 10,205	$ 10,175
Charge-Offs
Recoveries	20	30
Provision
Allowance for loan losses, Ending Balance	10,225	10,205
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning Balance	3,652	3,261
Charge-Offs
Recoveries	20	30
Provision	507	361
Allowance for loan losses, Ending Balance	4,179	3,652
Real Estate Commercial Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning Balance	1,394	1,662
Charge-Offs
Recoveries
Provision	23	(268)
Allowance for loan losses, Ending Balance	1,417	1,394
Real Estate Commercial Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning Balance	70	47
Charge-Offs
Recoveries
Provision	19	23
Allowance for loan losses, Ending Balance	89	70
Real Estate Faith based Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning Balance	3,962	4,027
Charge-Offs
Recoveries
Provision	(1)	(65)
Allowance for loan losses, Ending Balance	3,961	3,962
Real Estate Faith-based Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning Balance	196	85
Charge-Offs
Recoveries
Provision	(41)	111
Allowance for loan losses, Ending Balance	155	196
Industrial Revenue Bonds [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning Balance	52	101
Charge-Offs
Recoveries
Provision	(52)	(49)
Allowance for loan losses, Ending Balance		52
Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Beginning Balance	879	992
Charge-Offs
Recoveries
Provision	(455)	(113)
Allowance for loan losses, Ending Balance	$ 424	$ 879

Premises and Equipment (Summary of Premises and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 56,897	$ 52,484
Less accumulated depreciation	34,866	30,898
Total	22,031	21,586
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	873	873
Building [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	14,684	13,386
Leaseholds and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	2,537	2,120
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	16,332	14,801
Software [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	5,043	4,819
Internally Developed Software [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 17,428	$ 16,485

Premises and Equipment (Schedule of Future Minimum Rental Payments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Abstract]
2019	$ 1,639
2020	1,902
2021	1,769
2022	1,646
2023	724
2024	3,040
Total	$ 10,720

Acquired Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 442	$ 427	$ 408
2019	412
2020	406
2021	406
2022	88
2023	$ 88
Customer Lists [Member] \| Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period	7 years
Customer Lists [Member] \| Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period	10 years
Patents [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period	18 years
Noncompete Agreements [Member] \| Minimum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period	2 years
Noncompete Agreements [Member] \| Maximum [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period	5 years
Software [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period	3 years
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization period	15 years

Acquired Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Thousands

Dec. 31, 2018

Dec. 31, 2017

$ 18,222

Goodwill, Gross Carrying Amount

(4,099)

(3,657)

Unamortized intangible assets:

^[1]

12,796

Goodwill, Accumulated Amortization

^[1]

(227)

Customer Lists [Member]

4,288

(3,071)

(2,702)

Patents [Member]

Noncompete Agreements [Member]

(16)

(12)

332

(326)

(291)

Software [Member]

234

Other Intangible Assets [Member]

(234)

500

$ (225)

$ (191)

[1]	Amortization through December 31, 2001 prior to adoption of FASB ASC 350.

Interest-Bearing Deposits (Schedule of Interest-bearing Deposits) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Interest-Bearing Deposits [Abstract]
Interest-bearing demand deposits	$ 322,709	$ 332,881
Savings deposits	13,502	11,168
Time deposits:
Less than $100	4,862	2,658
$100 to less than $250	51,658	33,385
$250 or more	15,937	16,455
Total	$ 408,668	$ 396,547
Weighted average interest rate	1.00%	0.56%

Interest-Bearing Deposits (Schedule of Interest on Deposits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest-Bearing Deposits [Abstract]
Interest-bearing demand deposits	$ 2,832	$ 1,611	$ 1,387
Savings deposits	109	79	100
Time deposits:
Less than $100	433	234	274
$100 to less than $250	152	114	191
$250 or more	210	149	77
Total	$ 3,736	$ 2,187	$ 2,029

Interest-Bearing Deposits (Schedule of Maturities of Time Deposits) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Due within:
One year	$ 51,154	$ 48,370
Two years	18,262	281
Three years	140	2,383
Four years	983	25
Five years	1,918	1,439
Total	$ 72,457	$ 52,498
Percent of Total One year	70.60%	92.10%
Percent of Total Two years	25.20%	0.50%
Percent of Total Three years	0.20%	4.50%
Percent of Total Four years	1.40%	0.10%
Percent of Total Five years	2.60%	2.80%
Total	100.00%	100.00%

Unused Available Lines of Credit (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Line of credit amount	$ 83,000
Unsecured Debt [Member] \| US Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	20,000
Unsecured Debt [Member] \| UMB Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	20,000
Unsecured Debt [Member] \| Wells Fargo Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	15,000
Unsecured Debt [Member] \| PNC Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	12,000
Unsecured Debt [Member] \| Frost National Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	10,000
Unsecured Debt [Member] \| JPM Chase Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	6,000
Secured Debt [Member] \| UMB Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	50,000
Secured Debt [Member] \| Federal Home Loan Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	193,460
Secured Debt [Member] \| First Tennessee Bank [Member]
Line of Credit Facility [Line Items]
Line of credit amount	$ 50,000

Common Stock and Earnings per Share (Schedule of Common Stock Outstanding) (Details)	12 Months Ended
	Dec. 31, 2018 shares
Earnings Per Share [Abstract]
Shares outstanding at January 1	12,286,896
20% stock dividend paid on December 14, 2018	2,457,484
Issuance of common stock:
Employee restricted stock grants	9,530
Employee SARs exercised	12,048
Directors' compensation	9,526
Shares repurchased	(163,634)
Shares forfeited	(564)
Shares outstanding at December 31	14,611,286

Common Stock and Earnings per Share (Schedule of Calculations of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic
Net income	$ 7,057	$ 7,610	$ 7,509	$ 8,092	$ 5,331	$ 6,863	$ 6,513	$ 6,307	$ 30,268	$ 25,014	$ 24,348
Weighted average common shares outstanding (in shares)									14,675,136	14,700,557	14,718,228
Basic earnings per share (in dollars per share)	$ 0.48	$ .52	$ 0.51	$ .55	$ .36	$ .47	$ .44	$ .43	$ 2.06	$ 1.70	$ 1.65
Diluted
Net income	$ 7,057	$ 7,610	$ 7,509	$ 8,092	$ 5,331	$ 6,863	$ 6,513	$ 6,307	$ 30,268	$ 25,014	$ 24,348
Weighted average common shares outstanding (in shares)									14,675,136	14,700,557	14,718,228
Effect of dilutive restricted stock, performance based restricted stock ("PBRS"), and SARs									239,065	215,332	206,878
Weighted average common shares outstanding assuming dilution (in shares)									14,914,202	14,915,890	14,925,106
Diluted earnings per share (in dollars per share)	$ 0.47	$ 0.51	$ 0.50	$ 0.54	$ 0.36	$ 0.46	$ 0.44	$ 0.42	$ 2.03	$ 1.68	$ 1.63

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Defined Benefit Plan Disclosure [Line Items]

Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ 2,341	$ 2,031
Defined contribution plan, contribution amount	$ 1,109	925	$ 658
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset	51.00%
U.S. Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset	19.00%
Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target plan asset	30.00%
Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 83,724	85,236
Recognized prior service (cost) benefit	0
Net gains (losses) as a component of net periodic benefit cost	1,634
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	8,830	8,734
Benefits paid	260	247	247
Recognized prior service (cost) benefit	0
Net gains (losses) as a component of net periodic benefit cost	277
Noncontributory Profit Sharing Program [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions for plan	$ 6,810	$ 5,799	$ 5,367

Employee Benefit Plans (Schedule of Projected Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Projected benefit obligation:
Balance, January 1	$ 98,790	$ 85,551
Service cost	4,017	3,733
Interest cost	3,703	3,621
Actuarial (gain) loss	(7,768)	7,916
Benefits paid	(2,341)	(2,031)
Balance, December 31	96,401	98,790
Plan assets:
Fair value, January 1	81,427	73,168
Actual return	(4,506)	10,290
Employer contribution
Benefits paid	(2,341)	(2,031)
Fair value, December 31	74,580	81,427
Funded status:
Accrued pension liability	$ (21,821)	$ (17,363)

Employee Benefit Plans (Schedule of Assumptions used to Determine the Projected Benefit Obligation) (Details) - Defined Benefit Plan [Member]

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Weighted average discount rate

4.30%

3.75%

4.25%

Rate of increase in compensation levels

^[1]

[1]	6.0% graded down to 3.25% over the first seven years of service.

Employee Benefit Plans (Schedule of Expected Pension Benefit Payments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Retirement Benefits [Abstract]
2019	$ 2,893
2020	3,099
2021	3,363
2022	3,769
2023	4,196
2024-2028	$ 25,643

Employee Benefit Plans (Schedule of Plan's Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 4,017	$ 3,733
Interest cost on projected benefit obligations	3,703	3,621
Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	4,017	3,733	$ 3,559
Interest cost on projected benefit obligations	3,703	3,621	3,505
Expected return on plan assets	(5,202)	(4,681)	(4,734)
Net amortization and deferral	1,522	1,382	1,259
Net periodic pension cost	$ 4,040	$ 4,055	$ 3,589

Employee Benefit Plans (Schedule of Assumptions used to Determine Net Pension Cost) (Details)

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Retirement Benefits [Abstract]

Weighted average discount rate

3.75%

4.25%

4.50%

Rate of increase in compensation levels

^[1]

Expected long-term rate of return on assets

6.50%

6.75%

[1]	6.0% graded down to 3.25% over the first seven years of service.

Employee Benefit Plans (Schedule of Long-term Rate of Return on Assets (Details)	12 Months Ended
	Dec. 31, 2018
Fixed Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of Total Portfolio	51.00%
One-Year Nominal Return	4.44%
Annual Standard Deviation	3.90%
Large Cap U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of Total Portfolio	14.00%
One-Year Nominal Return	7.02%
Annual Standard Deviation	15.10%
Small Cap U.S. Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of Total Portfolio	5.00%
One-Year Nominal Return	8.04%
Annual Standard Deviation	18.75%
International (Developed) [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of Total Portfolio	25.00%
One-Year Nominal Return	8.19%
Annual Standard Deviation	17.36%
International (Emerging) [Member]
Defined Benefit Plan Disclosure [Line Items]
Percent of Total Portfolio	5.00%
One-Year Nominal Return	10.45%
Annual Standard Deviation	25.35%

Employee Benefit Plans (Summary of the Fair Value Measurements by Type of Asset) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Total	$ 74,580	$ 81,427	$ 73,168
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	423	374
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	74,157	81,053
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	423	374
Cash [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	423	374
Cash [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Small/Mid Cap Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,405	4,111
U.S. Small/Mid Cap Growth [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Small/Mid Cap Growth [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,405	4,111
Non-U.S. Core [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	18,398	21,065
Non-U.S. Core [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Non-U.S. Core [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	18,398	21,065
U.S. Large Cap Passive [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	10,471	11,717
U.S. Large Cap Passive [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Large Cap Passive [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	10,471	11,717
Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,217	4,052
Emerging Markets [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Emerging Markets [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	3,217	4,052
U.S. Core Opportunistic [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	10,609	11,284
U.S. Core Opportunistic [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Core Opportunistic [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	10,609	11,284
U.S. Passive [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	23,827	24,345
U.S. Passive [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
U.S. Passive [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	23,827	24,345
Opportunistic [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	4,230	4,479
Opportunistic [Member] \| Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total
Opportunistic [Member] \| Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total	$ 4,230	$ 4,479

Employee Benefit Plans (Summary of the Activity in the SERP's Projected Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Benefit obligation:
Balance, January 1	$ 98,790	$ 85,551
Service cost	4,017	3,733
Interest cost	3,703	3,621
Benefits paid	(2,341)	(2,031)
Actuarial (gain) loss	(7,768)	7,916
Balance, December 31	96,401	98,790	$ 85,551
Supplemental Executive Retirement Plan [Member]
Benefit obligation:
Balance, January 1	10,094	9,132
Service cost	92	143	133
Interest cost	348	360	367
Benefits paid	(260)	(247)	(247)
Actuarial (gain) loss	(177)	706
Balance, December 31	$ 10,097	$ 10,094	$ 9,132

Employee Benefit Plans (Schedule of Assumptions used to Determine Projected Benefit Obligation of the SERP) (Details) - Supplemental Executive Retirement Plan [Member]

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Defined Benefit Plan Disclosure [Line Items]

Weighted average discount rate

4.10%

3.50%

4.00%

Rate of increase in compensation levels

^[1]

[1]	6.0% graded down to 3.25% over the first seven years of service.

Employee Benefit Plans (Schedule of Expected Future Benefits Payable) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2019	$ 2,893
2020	3,099
2021	3,363
2022	3,769
2023	4,196
2024-2028	25,643
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
2019	313
2020	312
2021	372
2022	749
2023	817
2024-2028	$ 4,014

Employee Benefit Plans (Schedule of SERP's Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 4,017	$ 3,733
Interest cost on projected benefit obligations	3,703	3,621
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	92	143	$ 133
Interest cost on projected benefit obligations	348	360	367
Net amortization and deferral	581	324	295
Net periodic pension cost	$ 1,021	$ 827	$ 795

Employee Benefit Plans (Schedule of the Pretax amounts in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost
Net actuarial loss	23,580	23,160
Total	23,580	23,160
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost
Net actuarial loss	1,629	2,388
Total	$ 1,629	$ 2,388

Stock-based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Dec. 14, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance		1,500,000
Percentage of dividend	20.00%
Share-Based Compensation		$ 3,006	$ 2,339	$ 1,959
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		35,000	31,277	47,779
Shares granted, weighted average grant date market value			$ 49.55	$ 38.13
Amortization of restricted stock bonus		$ 1,571	$ 1,743	$ 1,712
Total unrecognized compensation expense, weighted average period		9 months
Total fair value of shares vested		$ 1,112	$ 1,389	$ 1,500
Fair value of granted shares per share		$ 49.79
Performance-based restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		35,602	30,388
Vesting period		3 years	3 years
Fair value of granted shares per share		$ 48.67	$ 49.33
Expense incurred to grant shares		$ 745	$ 690
Percentage of financial goal		144.00%	132.00%
Performance-based restricted shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target opportunity for awards to vest		0.00%	0.00%
Performance-based restricted shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target opportunity for awards to vest		150.00%	150.00%
SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense		$ 0
Total intrinsic value of options exercised		$ 1,110	$ 892
Average remaining contractual term		3 years 6 months	5 years 11 days
Outstanding, Aggregate Intrinsic Value		$ 5,468	$ 7,291
Share-Based Compensation		$ 0

Stock-based Compensation (Schedule of Restricted Stock Outstanding) (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares
Balance at December 31, 2017	93,775
Granted	35,000	31,277	47,779
Vested	(28,487)
Forfeited	(564)
Balance at December 31, 2018	99,724	93,775
Weighted Average Grant Date Fair Value
Balance at December 31, 2017	$ 41.92
Granted	49.79
Vested	39.03
Forfeited	46.70
Balance at December 31, 2018	$ 45.48	$ 41.92

Stock-based Compensation (Schedule of SARs Oustanding) (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
SARs
Forfeited	(564)
SARs [Member]
SARs
Balance at December 31, 2017	281,067
Exercised	(43,946)
Forfeited
Balance at December 31, 2018	237,121
Exercisable at December 31, 2018	237,121
Weighted Average Exercise Price
Balance at December 31, 2017 \| $ / shares	$ 29.14
Exercised \| $ / shares	25.26
Forfeited \| $ / shares
Balance at December 31, 2018 \| $ / shares	29.86
Exercisable at December 31, 2018 \| $ / shares	$ 29.86

Other Operating Expense (Schedule of Other Operating Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Postage and supplies	$ 2,180	$ 2,087	$ 1,925
Promotional expense	3,344	2,557	2,187
Professional fees	2,170	1,650	1,930
Outside service fees	4,909	4,424	3,316
Data processing services	919	897	372
Telecommunications	778	749	1,000
Other	1,963	1,722	1,913
Total other operating expense	$ 16,263	$ 14,086	$ 12,643

Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands

1 Months Ended

3 Months Ended

12 Months Ended

Jan. 31, 2018

Dec. 22, 2017

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Income Taxes [Line Items]

Statutory federal tax rate

21.00%

35.00%

Change in corporate federal statutory income tax rate

25.00%

21.00%

Net operating loss carryforward

^[1]

$ 50

$ 76

$ 50

$ 76

Amounts of tax benefits that would affect effective tax rate if recognized

1,272

1,464

1,272

1,464

$ 1,225

Income tax accrued interest

136

139

136

139

108

Increase (reduction) in accrued interest

Reduction of tax benefits over the next twelve months

316

Percentage of pre-tax income tax rate

1,502

$ 1,481

$ 1,387

$ 1,709

$ 3,576

^[2]

$ 2,396

$ 2,248

$ 1,665

$ 6,079

^[3]

$ 9,885

^[2],[3]

$ 7,716

^[3]

17.00%

28.00%

24.00%

Non-cash charge

$ (74)

$ 1,824

Impact of the reduction in the corporate tax rate deferred tax assets and liabilities expected

1,824

Reduction of tax expense

Franklin Bancorp [Member]

Income Taxes [Line Items]

Net operating loss carryforward

238

Limitations on use

$ 122

Net operating loss carryforward expiration date

Dec. 31, 2020

[1]	As of December 31, 2018, the Company had approximately $238,000 of net operating loss carry forwards as a result of the acquisition of Franklin Bancorp. The utilization of the net operating loss carry forward is subject to Section 382 of the Internal Revenue Code and limits the Company's use to approximately $122,000 per year during the carry forward period, which expires in 2020.
[2]	Includes one-time, non-cash TCJA charge of $1,824,000
[3]	Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.

Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

^[1]

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Current:

Federal

$ 8,557

$ 4,250

$ 6,456

State

1,043

1,638

941

Deferred:

Federal

(3,404)

4,256

301

State

(117)

(259)

Total income tax expense

$ 1,502

$ 1,481

$ 1,387

$ 1,709

$ 3,576

$ 2,396

$ 2,248

$ 1,665

$ 6,079

^[2]

$ 9,885

^[1],[2]

$ 7,716

^[2]

[1]	Includes one-time, non-cash TCJA charge of $1,824,000
[2]	Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.

Income Taxes (Schedule of Reconciliation of Expected Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

^[1]

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Expected income tax expense

$ 7,633

$ 12,214

$ 11,223

(Reductions) increases resulting from:

Tax-exempt income

(2,009)

(3,868)

(3,754)

State taxes, net of federal benefit

732

896

623

Share-based compensation adjustment

(286)

(376)

Adjustment of deferred tax asset or liability for TCJA

(74)

1,824

Other, net

(805)

(376)

Total income tax expense

$ 1,502

$ 1,481

$ 1,387

$ 1,709

$ 3,576

$ 2,396

$ 2,248

$ 1,665

$ 6,079

^[2]

$ 9,885

^[1],[2]

$ 7,716

^[2]

[1]	Includes one-time, non-cash TCJA charge of $1,824,000
[2]	Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands

Dec. 31, 2018

Dec. 31, 2017

Deferred tax assets:

Allowance for loan losses

$ 2,376

$ 2,413

ASC 715 pension funding liability

6,000

6,080

Net operating loss carryforward

^[1]

Supplemental executive retirement plan accrual

1,968

1,833

Stock compensation

1,673

1,307

Other

118

Total deferred tax assets

12,067

11,827

Deferred tax liabilities:

Premises and equipment

(1,937)

(2,248)

Pension

(409)

(1,379)

Intangible/assets

(1,212)

(1,091)

Unrealized gain on investment in securities available-for-sale

(156)

(1,938)

Deferred income

(2,121)

Other

(80)

Total deferred tax liabilities

(3,794)

(8,777)

Net deferred tax assets

$ 8,273

$ 3,050

[1]

As of December 31, 2018, the Company had approximately $238,000 of net operating loss carry forwards as a result of the acquisition of Franklin Bancorp. The utilization of the net operating loss carry forward is subject to Section 382 of the Internal Revenue Code and limits the Company's use to approximately $122,000 per year during the carry forward period, which expires in 2020.

Income Taxes (Schedule of the Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at January 1	$ 1,632	$ 1,623	$ 1,194
Changes in unrecognized tax benefits as a result of tax positions taken during a prior year	(135)	(15)	407
Changes in unrecognized tax benefits as a result of tax position taken during the current year	192	263	311
Decreases in unrecognized tax benefits relating to settlements with taxing authorities
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations	(286)	(239)	(289)
Balance at December 31	$ 1,403	$ 1,632	$ 1,623

Disclosures about Fair Value of Financial Instruments (Schedule of Commitments to Extend Credit, Standby Letters of Credit and Commercial Letters) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments To Extend Credit [Member]
Other Commitments [Line Items]
Long-term Line of Credit	$ 144,010	$ 87,013
Standby Letters Of Credit [Member]
Other Commitments [Line Items]
Long-term Line of Credit	11,368	14,347
Commercial Letters Of Credit [Member]
Other Commitments [Line Items]
Long-term Line of Credit	$ 3,486	$ 3,246

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Disclosures about Fair Value of Financial Instruments (Summary of the Company's Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Cash and cash equivalents, Carrying Amount	$ 230,933	$ 228,110	$ 266,743	$ 253,172
Investment in securities, Carrying Amount	441,534	470,523
Loans, net, Carrying Amount	711,362	676,026
Accrued interest receivable, Carrying Amount	7,069	7,413
Assets, Carrying Amount	1,390,898	1,382,072
Cash and cash equivalents, Fair Value	230,933	228,110
Investment in securities, Fair Value	441,534	470,523
Loans, net, Fair Value	711,090	675,020
Accrued interest receivable, Fair Value	7,069	7,413
Assets, Fair Value	1,390,626	1,381,066
Deposits, Carrying Amount	721,926	678,088
Accounts and drafts payable, Carrying Amount	694,360	661,888
Accrued interest payable, Carrying Amount	91	55
Liabilities, Carrying Amount	1,416,377	1,340,031
Deposits, Fair Value	722,018	678,346
Accounts and drafts payable, Fair Value	694,360	661,888
Accrued interest payable, Fair Value	91	55
Liabilities, Fair Value	$ 1,416,469	$ 1,340,289

Revenue from Contracts with Customers (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fee revenue and other income:
In-scope of FASB ASC 606 - Invoice processing fees									$ 78,461	$ 72,961	$ 67,276
In-scope of FASB ASC 606 - Invoice payment fees									23,720	20,361	16,437
Information services payment and processing revenue									102,181	93,322	83,713
Bank service fees									1,335	1,349	1,276
Fee revenue (in-scope of FASB ASC 606)									103,516	94,671	84,989
Other income (out-of-scope of FASB ASC 606)									560	841	1,147
Total fee revenue and other income	$ 26,627	$ 26,435	$ 25,640	$ 25,374	$ 24,734	$ 24,207	$ 23,800	$ 22,771	104,076	95,512	86,136
Net interest income after provision for loan losses (out-of-scope of FASB ASC 606)									44,190	39,790	39,401
Total net revenue									$ 148,266	$ 135,302	$ 125,537

Industry Segment Information (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

$ 104,076

$ 95,512

$ 86,136

^[1]

50,348

47,667

45,431

$ 1,234

$ 1,029

$ 794

$ 679

$ 666

$ 571

$ 470

$ 480

3,736

2,187

2,029

4,396

4,051

3,653

1,502

$ 1,481

$ 1,387

$ 1,709

3,576

^[2]

$ 2,396

$ 2,248

$ 1,665

6,079

^[1]

9,885

^[1],[2]

7,716

^[1]

12,569

11,590

1,554

1,996

1,554

1,996

1,997

1,695,176

1,657,209

1,695,176

1,657,209

1,504,839

Information Services [Member]

1,215,386

1,203,479

1,215,386

1,203,479

1,160,700

102,839

93,484

83,821

^[1]

22,273

20,634

18,729

4,254

3,902

3,488

^[1]

24,962

24,990

20,065

12,433

11,454

1,554

1,996

1,554

1,996

1,997

826,201

854,214

826,201

854,214

763,999

Banking Services [Member]

642,733

604,493

642,733

604,493

545,726

1,307

1,547

1,417

^[1]

23,706

23,732

24,088

3,736

2,187

2,029

1,880

1,362

1,136

142

149

165

^[1]

11,625

13,691

15,090

136

886,291

830,672

886,291

830,672

756,164

Corporate Eliminations and Other [Member]

572,653

598,986

572,653

598,986

614,974

(70)

481

898

^[1]

4,369

3,301

2,614

(1,880)

(1,362)

(1,136)

^[1]

2,181

1,908

2,410

(17,316)

(27,677)

(17,316)

(27,677)

(15,324)

Information services revenue

[1]	Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.
[2]	Includes one-time, non-cash TCJA charge of $1,824,000

Condensed Financial Information of Parent Company (Schedule of Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 15,042	$ 17,422
Securities available-for-sale, at fair value	441,534	470,523
Loans, net	711,362	676,026
Premises and equipment, net	22,031	21,586
Other assets	97,032	90,369
Total assets	1,695,176	1,657,209	$ 1,504,839
Liabilities and Shareholders' Equity
Accounts and drafts payable	694,360	661,888
Other liabilities	49,042	38,145
Total liabilities	1,465,328	1,432,121
Total shareholders' equity	229,848	225,088	$ 208,035	$ 207,378
Total liabilities and shareholders' equity	1,695,176	1,657,209
Parent [Member]
Assets
Cash and due from banks	35,735	56,462
Short-term investments	35,201	48,324
Securities available-for-sale, at fair value	441,534	470,523
Loans, net	20,188	12,239
Investments in subsidiaries	130,231	113,681
Premises and equipment, net	21,358	20,927
Other assets	278,151	199,865
Total assets	962,398	922,021
Liabilities and Shareholders' Equity
Accounts and drafts payable	693,026	661,342
Other liabilities	39,362	35,533
Total liabilities	732,388	696,875
Total shareholders' equity	230,010	225,146
Total liabilities and shareholders' equity	$ 962,398	$ 922,021

Condensed Financial Information of Parent Company (Schedule of Condensed Statement of Income) (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Income from subsidiaries:

$ 102,181

$ 93,322

$ 83,713

Net interest income after provision

44,190

39,790

39,401

(Losses) gains on sales of securities

(42)

387

Total net revenue

148,266

135,302

125,537

Expenses:

Salaries and employee benefits

85,881

77,339

72,581

Other expenses

1,963

1,722

1,913

Total operating expense

$ 29,744

$ 28,530

$ 27,463

$ 26,182

$ 26,142

$ 25,042

$ 24,901

$ 24,318

111,919

100,403

93,473

1,502

1,481

1,387

1,709

3,576

^[1]

2,396

2,248

1,665

6,079

^[2]

9,885

^[1],[2]

7,716

^[2]

Information services revenue

$ 7,057

$ 7,610

$ 7,509

$ 8,092

$ 5,331

$ 6,863

$ 6,513

$ 6,307

30,268

25,014

24,348

Parent Company [Member]

Income from subsidiaries:

Interest

Management fees

2,668

2,172

2,105

Income from subsidiaries

2,668

2,172

2,107

100,628

93,133

83,543

Net interest income after provision

14,159

13,217

13,389

(Losses) gains on sales of securities

(42)

387

Other income

456

483

504

Total net revenue

117,869

109,005

99,930

Expenses:

Salaries and employee benefits

77,946

70,409

65,968

Other expenses

23,442

20,333

18,133

Total operating expense

101,388

90,742

84,101

Income before income tax and equity in undistributed income of subsidiaries

16,481

18,263

15,829

Income before undistributed income of subsidiaries

1,788

4,394

1,540

14,693

13,869

14,289

Equity in undistributed income of subsidiaries

15,575

11,145

10,059

Supplemental Income Statement Elements [Abstract]

$ 30,268

$ 25,014

$ 24,348

[1]	Includes one-time, non-cash TCJA charge of $1,824,000
[2]	Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.

Condensed Financial Information of Parent Company (Schedule of Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ 7,057	$ 7,610	$ 7,509	$ 8,092	$ 5,331	$ 6,863	$ 6,513	$ 6,307	$ 30,268	$ 25,014	$ 24,348
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Net cash provided by operating activities									48,335	38,890	35,189
Cash flows from investing activities:
Net decrease (increase) in securities									(82,022)	(124,777)	(96,290)
Net (increase) decrease in loans									(35,336)	(21,335)	(5,771)
Purchases of premises and equipment, net									(4,399)	(4,127)	(4,684)
Net cash used in investing activities									(46,795)	(139,839)	(41,551)
Cash flows from financing activities:
Net increase in accounts and drafts payable									(19,595)	19,601	65,028
Cash dividends paid									(13,177)	(10,675)	(9,979)
Purchase of common shares of treasury									(8,838)	(2,270)	(9,215)
Other financing activities									(945)	(467)	(1,378)
Net cash provided by financing activities									1,283	62,316	19,933
Net increase (decrease) in cash and cash equivalents									2,823	(38,633)	13,571
Cash and cash equivalents at beginning of year				228,110				266,743	228,110	266,743	253,172
Cash and cash equivalents at end of year	230,933				228,110				230,933	228,110	266,743
Parent Company [Member]
Cash flows from operating activities:
Net income									30,268	25,014	24,348
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Equity in undistributed income of subsidiaries									(15,575)	(11,145)	(10,059)
Net change in other assets									(76,686)	(41,013)	(7,085)
Net change in other liabilities									3,829	10,118	6,683
Amortization of stock-based awards									2,583	1,743	1,677
Other, net									10,242	9,219	7,558
Net cash provided by operating activities									(45,339)	(6,064)	23,122
Cash flows from investing activities:
Net decrease (increase) in securities									14,615	(80,621)	(33,025)
Net (increase) decrease in loans									(7,949)	34,944	40,431
Purchases of premises and equipment, net									(4,211)	(4,020)	(4,557)
Net cash used in investing activities									2,455	(49,697)	2,849
Cash flows from financing activities:
Net increase in accounts and drafts payable									31,684	20,397	64,026
Cash dividends paid									(13,177)	(10,675)	(9,979)
Purchase of common shares of treasury									(8,838)	(2,270)	(9,215)
Other financing activities									(635)	(267)	1,705
Net cash provided by financing activities									9,034	7,185	46,537
Net increase (decrease) in cash and cash equivalents									(33,850)	(48,576)	72,508
Cash and cash equivalents at beginning of year				$ 104,786				$ 153,362	104,786	153,362	80,854
Cash and cash equivalents at end of year	$ 70,936				$ 104,786				$ 70,936	$ 104,786	$ 153,362

SUPPLEMENTARY FINANCIAL INFORMATION (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Fee revenue and other income

$ 26,627

$ 26,435

$ 25,640

$ 25,374

$ 24,734

$ 24,207

$ 23,800

$ 22,771

$ 104,076

$ 95,512

$ 86,136

12,910

12,215

11,513

11,288

10,981

10,665

10,332

9,999

47,926

41,977

39,930

Provision for loan losses

1,234

1,029

794

679

666

571

470

480

3,736

2,187

2,029

Net interest income

11,676

11,186

10,719

10,609

10,315

10,094

9,862

9,519

44,190

39,790

37,901

(1,500)

Operating expense

29,744

28,530

27,463

26,182

26,142

25,042

24,901

24,318

111,919

100,403

93,473

1,502

1,481

1,387

1,709

3,576

^[1]

2,396

2,248

1,665

6,079

^[2]

9,885

^[1],[2]

7,716

^[2]