Hills Bancorporation (HBIA) 10-K 5 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 28, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	HILLS BANCORPORATION
Entity Central Index Key	732,417
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 447,928,780
Entity Common Stock, Shares Outstanding		9,387,412
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 43,305	$ 154,353
Investment securities available for sale at fair value (amortized cost 2018 $321,660; 2017 $286,296) (Notes 1, 2 and 12)	318,926	285,155
Stock of Federal Home Loan Bank	12,172	15,005
Stock of Federal Home Loan Bank	1,984	5,162
Loans, net of allowance for loan losses (2018 $37,810; 2017 $29,400) (Notes 1, 3, and 11)	2,591,085	2,431,165
Property and equipment, net (Note 4)	37,051	37,857
Tax credit real estate	9,193	10,076
Accrued interest receivable	11,784	10,772
Deferred income taxes, net (Note 9)	10,869	8,806
Goodwill	2,500	2,500
Other assets	3,595	2,509
Total Assets	3,042,464	2,963,360
Liabilities
Noninterest-bearing deposits	372,152	363,817
Interest-bearing deposits (Note 5)	2,048,972	1,924,748
Total deposits	2,421,124	2,288,565
Federal Home Loan Bank borrowings (Note 6)	215,000	295,000
Accrued interest payable	1,812	1,290
Other liabilities	20,776	23,481
Total Liabilities	2,658,712	2,608,336
Commitments and Contingencies (Notes 8 and 14)
Ownership Plan (ESOP) (Note 8)	48,870	43,308
Stockholders' Equity (Note 10)
Common stock, no par value; authorized 20,000,000 shares; issued 2018 10,325,191 shares; 2017 10,320,315 shares	0	0
Paid in capital	52,122	48,930
Retained earnings	371,848	341,558
Accumulated other comprehensive loss (Note 7)	(3,250)	(2,446)
Treasury stock at cost (2018 988,750 shares; 2017 985,161 shares)	(36,968)	(33,018)
Total Stockholders' Equity	383,752	355,024
Less maximum cash obligation related to ESOP shares (Note 8)	48,870	43,308
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	334,882	311,716
Total Liabilities & Stockholders' Equity	$ 3,042,464	$ 2,963,360

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Investment securities available for sale, amortized cost	$ 321,660	$ 286,296
Loans, allowance for loan losses	$ 37,810	$ 29,400
STOCKHOLDERS' EQUITY
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	20,000,000	20,000,000
Common stock, issued (in shares)	10,325,191	10,320,315
Treasury stock at cost (in shares)	988,750	985,161

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income:
Loans, including fees	$ 110,588	$ 100,579	$ 92,833
Investment securities:
Taxable	2,759	1,709	1,471
Nontaxable	3,511	3,231	3,210
Federal funds sold	1,939	433	163
Total interest income	118,797	105,952	97,677
Interest expense:
Deposits	19,531	9,742	7,757
Other borrowings	0	184	158
FHLB borrowings	6,792	8,046	8,172
Total interest expense	26,323	17,972	16,087
Net interest income	92,474	87,980	81,590
Provision for loan losses (Note 3)	8,497	1,688	(1,163)
Net interest income after provision for loan losses	83,977	86,292	82,753
Noninterest income:
Net gain on sale of loans	1,517	1,547	2,043
Other noninterest income	2,680	2,378	2,169
Total other income	23,818	20,818	19,995
Noninterest expenses:
Salaries and employee benefits	34,981	33,197	30,778
Occupancy	4,374	4,189	3,962
Furniture and equipment	5,741	5,580	5,368
Office supplies and postage	1,778	1,961	1,797
Advertising and business development	2,513	2,764	3,403
Outside services	10,076	8,303	7,584
FDIC insurance assessment	856	845	1,022
Other noninterest expenses	1,804	2,673	2,885
Total other expenses	62,123	59,512	56,799
Income before income taxes	45,672	47,598	45,949
Income taxes (Note 9)	8,905	19,537	14,394
Net income	$ 36,767	$ 28,061	$ 31,555
Earnings per share:
Basic (in dollars per share)	$ 3.93	$ 3.01	$ 3.40
Diluted (in dollars per share)	$ 3.92	$ 3.01	$ 3.40
Trust fees
Noninterest income:
Fee income	$ 10,007	$ 8,043	$ 7,033
Service charges and fees
Noninterest income:
Fee income	$ 9,614	$ 8,850	$ 8,750

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 36,767	$ 28,061	$ 31,555
Securities:
Net change in unrealized (loss) gain on securities available for sale	(1,593)	361	(3,746)
Income taxes	397	(139)	1,433
Other comprehensive (loss) income on securities available for sale	(1,196)	222	(2,313)
Derivatives used in cash flow hedging relationships:
Net change in unrealized gain on derivatives	1,223	1,119	242
Income taxes	(305)	(428)	(93)
Other comprehensive income on cash flow hedges	918	691	149
Other comprehensive (loss) income, net of tax	(278)	913	(2,164)
Comprehensive income	$ 36,489	$ 28,974	$ 29,391

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Maximum Cash Obligation Related To ESOP Shares [Member]
Beginning Balance at Dec. 31, 2015	$ 272,175	$ 43,697	$ 294,487	$ (1,195)	$ (27,252)	$ (37,562)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 23,163, 114,935, and 113,373 shares of common stock for the years ending 2016, 2017, and 2018, respectively	1,078	1,078	0	0	0	0
Issuance of 5,636, 6,892 and 8,172 shares of common stock under the employee stock purchase plan for the years ending 2016, 2017, and 2018, respectively	254	254	0	0	0	0
Unearned restricted stock compensation	(470)	(470)	0	0	0	0
Forfeiture of 1,264, 3,934 and 3,296 shares of common stock for the years ending 2016, 2017, and 2018, respectively	(52)	(52)	0	0	0	0
Share-based compensation	29	29	0	0	0	0
Income tax benefit related to share-based compensation	70	70	0	0	0	0
Change related to ESOP shares	(3,219)	0	0	0	0	(3,219)
Net income	31,555	0	31,555	0	0	0
Cash dividends ($0.65, $0.70, and $0.75 per share) for the years ending 2016, 2017, and 2018, respectively	(6,060)	0	(6,060)	0	0	0
Purchase of 85,362, 46,966, and 116,962 shares of common stock for the years ending 2016, 2017, and 2018, respectively	(3,926)	0	0	0	(3,926)	0
Other comprehensive loss	(2,164)	0	0	(2,164)	0	0
Ending Balance at Dec. 31, 2016	289,270	44,606	319,982	(3,359)	(31,178)	(40,781)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 23,163, 114,935, and 113,373 shares of common stock for the years ending 2016, 2017, and 2018, respectively	5,446	4,851	0	0	595	0
Issuance of 5,636, 6,892 and 8,172 shares of common stock under the employee stock purchase plan for the years ending 2016, 2017, and 2018, respectively	325	325	0	0	0	0
Unearned restricted stock compensation	(707)	(707)	0	0	0	0
Forfeiture of 1,264, 3,934 and 3,296 shares of common stock for the years ending 2016, 2017, and 2018, respectively	(156)	(156)	0	0	0	0
Share-based compensation	11	11	0	0	0	0
Change related to ESOP shares	(2,527)	0	0	0	0	(2,527)
Net income	28,061	0	28,061	0	0	0
Cash dividends ($0.65, $0.70, and $0.75 per share) for the years ending 2016, 2017, and 2018, respectively	(6,485)	0	(6,485)	0	0	0
Purchase of 85,362, 46,966, and 116,962 shares of common stock for the years ending 2016, 2017, and 2018, respectively	(2,435)	0	0	0	(2,435)	0
Other comprehensive loss	913	0	0	913	0	0
Ending Balance at Dec. 31, 2017	311,716	48,930	341,558	(2,446)	(33,018)	(43,308)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 23,163, 114,935, and 113,373 shares of common stock for the years ending 2016, 2017, and 2018, respectively	6,220	3,386	0	0	2,834	0
Issuance of 5,636, 6,892 and 8,172 shares of common stock under the employee stock purchase plan for the years ending 2016, 2017, and 2018, respectively	421	421	0	0	0	0
Unearned restricted stock compensation	(463)	(463)	0	0	0	0
Forfeiture of 1,264, 3,934 and 3,296 shares of common stock for the years ending 2016, 2017, and 2018, respectively	(152)	(152)	0	0	0	0
Change related to ESOP shares	(5,562)	0	0	0	0	(5,562)
Net income	36,767	0	36,767	0	0	0
Cash dividends ($0.65, $0.70, and $0.75 per share) for the years ending 2016, 2017, and 2018, respectively	(7,003)	0	(7,003)	0	0	0
Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings, Tax Effect			526	(526)
Purchase of 85,362, 46,966, and 116,962 shares of common stock for the years ending 2016, 2017, and 2018, respectively	(6,784)	0	0	0	(6,784)	0
Other comprehensive loss	(278)	0	0	(278)	0	0
Ending Balance at Dec. 31, 2018	$ 334,882	$ 52,122	$ 371,848	$ (3,250)	$ (36,968)	$ (48,870)

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)	113,373	114,935	23,163
Issuance of common stock purchased under the Employee Stock Purchase Plan (in shares)	8,172	6,892	5,636
Forfeiture of common stock (in shares)	3,296	3,934	1,264
Cash dividends (in dollars per share)	$ 0.750	$ 0.700	$ 0.650
Purchase of common stock (in shares)	116,962	46,966	85,362

CONSOLIDATED STATEMENTS OF CASH

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	$ 36,767	$ 28,061	$ 31,555
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation	3,012	2,856	2,745
Provision for loan losses	8,497	1,688	(1,163)
Share-based compensation	0	11	29
Compensation expensed through issuance of common stock	1,466	1,446	1,078
Excess tax benefits related to share-based compensation	0	0	(70)
Forfeiture of common stock	(152)	(156)	(52)
Provision for deferred income taxes	(1,971)	3,238	424
Net gain on sale of other real estate owned and other repossessed assets	(18)	(60)	(385)
Increase in accrued interest receivable	(1,012)	(1,651)	(449)
Amortization of premium on investment securities, net	480	586	595
(Increase) decrease in other assets	(1,086)	972	104
(Decrease) increase in accrued interest and other liabilities	(1,423)	4,263	(1,279)
Loans originated for sale	(136,746)	(150,264)	(208,952)
Proceeds on sales of loans	141,441	156,455	206,743
Net gain on sales of loans	(1,517)	(1,547)	(2,043)
Net cash and cash equivalents provided by operating activities	47,738	45,898	28,880
Cash Flows from Investing Activities
Proceeds from maturities of investment securities available for sale	57,284	65,339	54,323
Purchases of investment securities available for sale	(90,295)	(85,772)	(62,546)
Loans made to customers, net of collections	(168,567)	(181,631)	(147,248)
Proceeds on sale of other real estate owned and other repossessed assets	168	520	182
Purchases of property and equipment	(2,206)	(2,854)	(7,082)
Expense from tax credit real estate, net	883	487	875
Net cash and cash equivalents used in investing activities	(202,733)	(203,911)	(161,496)
Cash Flows from Financing Activities
Net increase in deposits	132,559	252,253	145,610
Net decrease in short-term borrowings	0	(33,489)	(10,562)
Net (decrease) increase in FHLB borrowings	(80,000)	60,000	10,000
Borrowings from FRB	1	820	1
Payments on FRB borrowings	(1)	(820)	(1)
Issuance of common stock, net of costs	4,713	3,762	0
Stock options exercised	41	238	0
Excess tax benefits related to share-based compensation	0	0	70
Purchase of treasury stock	(6,784)	(2,435)	(3,926)
Proceeds from the issuance of common stock through the employee stock purchase plan	421	325	254
Dividends paid	(7,003)	(6,485)	(6,060)
Net cash and cash equivalents used by financing activities	43,947	274,169	135,386
(Decrease) increase in cash and cash equivalents	(111,048)	116,156	2,770
Cash and cash equivalents:
Beginning of year	154,353	38,197	35,427
End of year	43,305	154,353	38,197
Cash payments for:
Interest paid to depositors	19,009	9,436	7,619
Interest paid on other obligations	6,792	8,230	8,330
Income taxes paid	9,924	14,488	14,113
Noncash financing activities:
Increase in maximum cash obligation related to ESOP shares	5,562	2,527	3,219
Transfers to other real estate owned	150	223	405
Sale and financing of other real estate owned	$ 96	$ 433	$ 720

Nature of Activities and Signif

Nature of Activities and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Activities and Significant Accounting Policies	Nature of Activities and Significant Accounting Policies Nature of activities : Hills Bancorporation (the "Company") is a holding company engaged in the business of commercial banking. The Company's subsidiary is Hills Bank and Trust Company, Hills, Iowa (the “Bank”), which is wholly-owned. The Bank is a full-service commercial bank extending its services to individuals, businesses, governmental units and institutional customers primarily in the communities of Hills, Iowa City, Coralville, North Liberty, Lisbon, Mount Vernon, Kalona, Wellman, Cedar Rapids, Marion and Washington, Iowa. The Bank competes with other financial institutions and non-financial institutions providing similar financial products. Although the loan activity of the Bank is diversified with commercial and agricultural loans, real estate loans, automobile, installment and other consumer loans, the Bank's credit is concentrated in real estate loans. All of the Company’s operations are considered to be one reportable operating segment. Accounting estimates : The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Certain significant estimates : The allowance for loan losses, fair values of securities and other financial instruments, and share-based compensation expense involve certain significant estimates made by management. These estimates are reviewed by management routinely and it is reasonably possible that circumstances that exist at December 31, 2018 may change in the near-term and the effect could be material to the consolidated financial statements. Principles of consolidation : The consolidated financial statements include the accounts of the Company and its subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation. Revenue recognition : Accounting Standards Codification ("ASC") 606, Revenue from Contracts with Customers ("ASC 606"), establishes principles for reporting information about the nature, amount, timing and uncertainty of revenue and cash flows arising from the Company’s contracts to provide goods or services to customers. The core principle requires an entity to recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration that it expects to be entitled to receive in exchange for those goods or services recognized as performance obligations are satisfied. The majority of the Company’s revenue-generating transactions are not subject to ASC 606, including revenue generated from financial instruments, such as loans, letters of credit and investment securities as these activities are not subject to the requirements of ASC 606. Interest income on loans and investment securities is recognized on the accrual method in accordance with written contracts. Loan origination fees of mortgage loans originated for sale are recognized when the loans are sold. Descriptions of the Company’s revenue-generating activities that are within the scope of ASC 606 are the following: Service charges and fees on deposit accounts represent general service fees for monthly account maintenance and activity- or transaction-based fees and consist of transaction-based revenue which includes interchange income, time-based revenue (service period), item-based revenue or some other individual attribute-based revenue. Revenue is recognized when the Company’s performance obligation is completed which is generally monthly for account maintenance services or when a transaction has been completed (such as a wire transfer). Payment for such performance obligations are generally received at the time the performance obligations are satisfied. Trust income represents monthly fees due from wealth management customers as consideration for managing the customers' assets. Wealth management and trust services include custody of assets, investment management, fees for trust services and similar fiduciary activities. Revenue is recognized when our performance obligation is completed each month, which is generally the time that payment is received. A contract asset balance occurs when an entity performs a service for a customer before the customer pays consideration (resulting in a contract receivable) or before payment is due (resulting in a contract asset). A contract liability balance is an entity's obligation to transfer a service to a customer for which the entity has already received payment (or payment is due) from the customer. As of December 31, 2018, the Company did not have any significant contract balances. In connection with the adoption of ASC 606, an entity is required to capitalize, and subsequently amortize into expense, certain incremental costs of obtaining a contract with a customer if these costs are expected to be recovered. The incremental costs of obtaining a contract are those costs that an entity incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained (for example, sales commission). The Company utilizes the practical expedient which allows entities to immediately expense contract acquisition costs when the asset that would have resulted from capitalizing these costs would have been amortized in one year or less. Upon adoption of ASC 606, the Company did not capitalize any contract acquisition costs. Cash and cash equivalents : The Company considers all investments with original maturities of three months or less to be cash equivalents. At December 31, 2018 and 2017 , cash equivalents consisted primarily of deposits with other banks. Investment securities : Available-for-sale securities consist of debt securities not classified as trading or held to maturity. Available-for-sale securities are stated at fair value, and unrealized holding gains and losses, net of the related deferred tax effect, are reported as a separate component of stockholders' equity. There were no trading or held to maturity securities as of December 31, 2018 or 2017 . Stock of the Federal Home Loan Bank is carried at cost. The Company has evaluated the stock and determined there is no impairment. Premiums on debt securities are amortized to the earliest call date and discounts on debt securities are accreted over the period to maturity of those securities. The method of amortization results in a constant effective yield on those securities (the interest method). Realized gains and losses on investment securities are included in income, determined on the basis of the cost of the specific securities sold. Declines in the fair value of investment securities available for sale (with certain exceptions for debt securities noted below) that are deemed to be other-than-temporary are charged to earnings as a realized loss, and a new cost basis for the securities is established. In evaluating other-than-temporary impairment, the Company considers the length of time and extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value in the near term. Declines in the fair value of debt securities below amortized cost are deemed to be other-than-temporary in circumstances where: (1) the Company has the intent to sell a security; (2) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell a security or if it is more likely than not that the Company will be required to sell the security before recovery, an other-than-temporary impairment write-down is recognized in earnings equal to the difference between the security’s amortized cost basis and its fair value. If the Company does not intend to sell the security or it is not more likely than not that the Company will be required to sell the security before recovery, the other-than-temporary impairment write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in other comprehensive income. Realized securities gains or losses on securities sales (using specific identification method) and declines in value judged to be other-than-temporary are included in investment securities gains (losses), net, in the consolidated statements of income. Loans : Loans are stated at the amount of unpaid principal, reduced by the allowance for loan losses. Interest income is accrued on the unpaid balances as earned. Loans held for sale are stated at the lower of aggregate cost or estimated fair value. Loans are sold on a non-recourse basis with servicing released and gains and losses are recognized based on the difference between sales proceeds and the carrying value of the loan. The Company has had very few experiences of repurchasing loans previously sold into the secondary market. A specific reserve was not considered necessary based on the Company’s historical experience with repurchase activity. The allowance for loan losses is established through a provision for loan losses charged to expense. Loans are charged against the allowance when management believes the collectability of principal is unlikely. The allowance for loan losses is maintained at a level considered adequate to provide for probable losses that can be reasonably anticipated. The allowance is increased by provisions charged to expense and is reduced by net charge-offs. The Bank makes continuous reviews of the loan portfolio and considers current economic conditions, historical loss experience, review of specific problem loans and other factors in determining the adequacy of the allowance. Management classifies loans within the following categories: excellent, good, satisfactory, monitor, special mention and substandard. The policy for charging off loans is consistent throughout all loan categories. A loan is charged off based on criteria that includes but is not limited to: delinquency status, financial condition of the entire customer credit line and underlying collateral coverage, economic or external conditions that might impact full repayment of the loan, legal issues, overdrafts, and the customer’s willingness to work with the Company. Loans are considered impaired when, based on current information and events, it is probable the Bank will not be able to collect all amounts due. An impaired loan includes any loan that has been placed on nonaccrual status, loans greater than 90 days past due and still accruing and TDR loans. They also include loans, based on current information and events, that it is likely the Bank will be unable to collect all amounts due according to the contractual terms of the original loan agreement. The portion of the allowance for loan losses applicable to impaired loans has been computed based on the present value of the estimated future cash flows of interest and principal discounted at the loans effective interest rate or on the fair value of the collateral for collateral dependent loans. The entire change in present value of expected cash flows of impaired loans or of collateral value is reported as provision expense in the same manner in which impairment initially was recognized or as a reduction in the amount of provision expense that otherwise would be reported. Interest income on nonaccrual loans is recognized once principal has been recovered. The accrual of interest income on loans is discontinued when, in the opinion of management, there is reasonable doubt as to the borrower's ability to meet payments of interest or principal when they become due, which is generally when a loan is 90 days or more past due. When a loan is placed on nonaccrual status, all previously accrued and unpaid interest is reversed. Loans are returned to an accrual status when all of the principal and interest amounts contractually due are brought current and repayment of the remaining contractual principal and interest is expected. A loan may also return to accrual status if additional collateral is received from the borrower and, in the opinion of management, the financial position of the borrower indicates that there is no longer any reasonable doubt as to the collection of the amount contractually due. Payment received on nonaccrual loans are applied first to principal. Once principal is recovered, any remaining payments received are applied to interest income. As of December 31, 2018 , none of the Company’s nonaccrual loans were earning interest on a cash basis. Nonrefundable loan fees and origination costs are deferred and recognized as a yield adjustment over the life of the related loan. Troubled debt restructurings (“TDR loans”) : A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that leads to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses to the Company. A loan that is modified at a market rate of interest is no longer classified as troubled debt restructuring in the quarter following the modification if the borrower is no longer experiencing financial difficulties. Performance prior to the restructuring is considered when assessing whether the borrower can meet the new terms. At the time of restructuring, loans included in a troubled debt restructuring may be considered nonaccrual loans. TDR loans are returned to accrual status under the same criteria noted under loans above. Transfers of financial assets : Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets. Credit related financial instruments : In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit and standby letters of credit. Such financial instruments are recorded when they are funded. Tax credit real estate : Tax credit real estate represents two multi-family rental properties, three assisted living rental properties, a multi-tenant rental property for persons with disabilities, and a multi-family senior living rental property, all which are affordable housing projects as of December 31, 2018 . The Bank has a 99% or greater limited partnership interest in each limited partnership. The investment in each was completed after the projects had been developed by the general partner. The Company evaluates the recoverability of the carrying value on a regular basis. If the recoverability was determined to be in doubt, a valuation allowance would be established by way of a charge to expense. Depreciation expense is provided on a straight-line basis over the estimated useful life of the assets. Expenditures for normal repairs and maintenance are charged to expense as incurred. In 2016, the Company adopted ASU 2015-02 and the investments in tax credit real estate are recorded for the years ended December 31, 2018, 2017 and 2016 using the equity method of accounting. The operations of the properties are not expected to contribute significantly to the Company’s income before income taxes. However, the properties do contribute in the form of income tax credits, which lowers the Company’s effective tax rate. Once established, the credits on each property last for ten years and are passed through from the limited partnerships to the Bank and reduces the consolidated federal tax liability of the Company. Property and equipment : Property and equipment is stated at cost less accumulated depreciation. Depreciation is computed using primarily declining-balance methods over the estimated useful lives of 7-40 years for buildings and improvements and 3-10 years for furniture and equipment. Deferred income taxes : Deferred income taxes are provided under the asset and liability method whereby deferred tax assets are recognized for deductible temporary differences and net operating loss, and tax credit carryforwards and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax bases. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are adjusted for the effects of changes in tax laws and rates on the date of enactment. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. Interest and penalties on unrecognized tax benefits are classified as other noninterest expense. As of December 31, 2018 , the Company had no material unrecognized tax benefits. Goodwill : Goodwill represents the excess of cost over the fair value of the net assets acquired, and is not subject to amortization, but requires, at a minimum, annual impairment tests for intangibles that are determined to have an indefinite life. Other real estate : Other real estate represents property acquired through foreclosures and settlements of loans. Property acquired is carried at the lower of the principal amount of the loan outstanding at the time of acquisition, plus any acquisition costs, or the estimated fair value of the property, less disposal costs. The Bank will obtain updated appraisals to determine the estimated fair value of the property based on the type of collateral securing the loan and the date of the latest appraisal. Subsequent write downs estimated on the basis of later valuations are charged to net loss on sale of other real estate owned and other repossessed assets. Net operating expenses incurred in maintaining such properties are charged to other non-interest expense. Net capital expenditures incurred are capitalized to the property. In 2017, the Company revised its reporting to include other real estate with other assets. Derivative financial instruments : The Bank uses interest rate swaps as part of its interest rate risk management. Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 815 establishes accounting and reporting standards for derivative instruments and hedging activities. The Bank records all interest rate swaps on the balance sheet at fair value. Derivatives used to hedge the exposure to variability in expected future cash flows are considered cash flow hedges. To qualify for hedge accounting, the Bank must comply with the detailed rules and documentation requirements at the inception of the hedge, and hedge effectiveness is assessed at inception and periodically throughout the life of the hedging relationship. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivatives is initially reported in other comprehensive income and subsequently reclassified to interest income or expense when the hedged transaction affects earnings, while the ineffective portion of changes in fair value of the derivative, if any, is recognized immediately in other noninterest income or expense. The Bank assesses the effectiveness of each hedging relationship by comparing the cumulative changes in cash flows of the derivative hedging instruments with the cumulative changes in cash flows of the designated hedged item or transaction. No component of the change in the fair value of the hedging instrument is excluded from the assessment of hedge effectiveness. The Bank does not use derivatives for trading or speculative purposes. Earnings per share: Basic earnings per share is computed using the weighted average number of actual common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that would occur from the exercise of common stock options outstanding. ESOP shares are considered outstanding for this calculation unless unearned. The following table presents calculations of earnings per share: Year Ended December 31, 2018 2017 2016 (Amounts In Thousands, except share and per share data) Computation of weighted average number of basic and diluted shares: Common shares outstanding at the beginning of the year 9,335,154 9,264,227 9,322,054 Weighted average number of net shares issued (redeemed) 31,160 65,776 (34,965 ) Weighted average shares outstanding (basic) 9,366,314 9,330,003 9,287,089 Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method 4,027 4,632 6,445 Weighted average number of shares (diluted) 9,370,341 9,334,635 9,293,534 Net income $ 36,767 $ 28,061 $ 31,555 Earnings per share: Basic $ 3.93 $ 3.01 $ 3.40 Diluted $ 3.92 $ 3.01 $ 3.40 Stock awards and options : Compensation expense for stock issued through the stock award plan is accounted for using the fair value method prescribed by FASB ASC 718, “Share-Based Payment” (“ASC 718”). Under this method, compensation expense is measured and recognized for all stock-based awards made to employees and directors based on the fair value of each award as of the date of the grant. Common stock held by ESOP : The Company's maximum cash obligation related to these shares is classified outside stockholders' equity because the shares are not readily traded and could be put to the Company for cash. Treasury Stock : Treasury stock is accounted for by the cost method, whereby shares of common stock reacquired are recorded at their purchase price. Trust Department Assets : Property held for customers in fiduciary or agency capacities is not included in the accompanying consolidated balance sheets, as such items are not assets of the Company. Effect of New Financial Accounting Standards : In May 2014, The FASB and International Accounting Standards Board (IASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of ASU 2014-09 is that a company 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 and services. ASU 2014-09 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. The Company has evaluated all of its noninterest income streams and contracts to determine potential impact. The adoption of ASU 2014-09 by the Company did not have a material impact on the recognition of revenue though did require additional disclosures on our material noninterest income streams discussed in revenue recognition above. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 created Subtopic 321-10, Investments-Equity Securities which is applicable to all entities except those in industries that account for substantially all investments at fair value through earnings or the change in net assets. Under this new subtopic, equity securities are generally required to be measured at fair value with unrealized holding gains and losses reflected in net income. ASU 2016-01 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. The Company adopted ASU 2016-01 for the period ending March 31, 2018. There was no material impact on the financial statements, however, it required the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes and eliminated the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. The revised disclosures are in Note 12 Fair Value Measurements. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases . The ASU provides guidance requiring lessees to recognize right-of-use (ROU) assets and lease liabilities for all leases other than those that meet the definition of short-term leases. For short-term leases, lessees may elect an accounting policy by class of underlying asset under which these assets and liabilities are not recognized and lease payments are generally recognized over the lease term on a straight-line basis. Under this new ASU, lessees will recognize right-of use assets and lease liabilities for most leases currently accounted for as operating leases under generally accepted accounting principles. For public companies, ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company adopted the ASU on January 1, 2019 and used the effective date as the date of initial application. Consequently, financial information will not be updated and the disclosures required under the new standard will not be provided for dates and periods before January 1, 2019. The new standard provides a number of optional practical expedients in transition. We elected the 'package of practical expedients', which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification and initial direct costs. We did not elect the use-of-hindsight or the practical expedient pertaining to land easements; the latter not being applicable to us. The most significant impact upon adoption relates to the recognition of new ROU assets and lease liabilities on our balance sheet for our equipment and real estate operating leases. Upon adoption, we recognized additional operating liabilities of $3.58 million, with corresponding ROU assets of the same amount based on the present value of the remaining minimum rental payments under current leasing standards for existing operating leases. In March 2016, the FASB issued ASU No. 2016-04, Liabilities - Extinguishments of Liabilities (Subtopic 405-20), Recognition of Breakage for Certain Prepaid Stored-Value Products . ASU 2016-04 applies to all entities that offer certain prepaid stored - value products. The ASU provides guidance for the derecognition of financial liabilities related to the issuance of these products and aligns the recognition of breakage to current authoritative guidance. For public companies, ASU 2016-04 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. The Company adopted ASU 2016-04 for the period ending March 31, 2018. There was no material impact on the financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments (CECL) . The ASU changes the way entities recognize impairment of financial assets by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets. Under the CECL model, we will be required to present certain financial assets carried at amortized cost, such as loans held for investment and held-to-maturity debt securities, at the net amount expected to be collected. The measurement of expected credit losses is to be based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This measurement will take place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the "incurred loss" model required under current GAAP, which delays recognition until it is probable a loss has been incurred. Accordingly, we expect that the adoption of the CECL model will materially affect how we determine our allowance for loan losses and could require us to significantly increase our allowance. For public companies, ASU 2016-13 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, early adoption is permitted for the fiscal year beginning after December 15, 2018. The Company has implemented a software solution to assist in the analysis of historical loan data to determine the CECL model that will be implemented. The Company anticipates running parallel calculations of the "incurred loss" and CECL models for the quarter ending March 31, 2019. We expect to recognize a one-time cumulative-effect adjustment to our allowance for loan losses as of the beginning of the first reporting period in which the new standard is adopted. The amount of the one-time cumulative-effect adjustment has not yet been determined. In January 2017, the FASB issued ASU No. 2017-03, Accounting Changes and Error Corrections (Topic 250) and Investments - Equity Method and Joint Ventures (Topic 323), Amendments to SEC Paragraphs Pursuant to Staff Announcements at the September 22, 2016 and November 17, 2016 EITF Meetings. This ASU adds an SEC paragraph and amends other Topics pursuant to an SEC staff Announcement made at the September 22, 2016 Emerging Issues Task Force (EITF) meeting. The SEC paragraph applies to ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606); ASU No. 2016-02, Leases (Topic 842); and ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU provides that a company should evaluate ASUs that have not yet been adopted to determine the appropriate financial statement disclosures about the potential material effects of those ASUs on the financial statements when adopted. If the company does not know or cannot reasonably estimate the impact that adoption of the ASUs referenced in this announcement is expected to have on the financial statements, then in addition to making a statement to that effect, the company should consider additional qualitative financial statement disclosures to assist the reader in assessing the significance of the impact that the standard will have on the financial statements of the company when adopted. Additional qualitative disclosures should include a description of the effect of the accounting policies that the company expects to apply and a comparison to the company's current accounting policies. Also, the company should describe the status of its process to implement the new standards and the significant implementation matters yet to be addressed. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 250), Simplifying the Test for Goodwill Impairment. The ASU simplifies the goodwill impairment test by requiring a company to perform its annual or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized when the carrying amount exceeds fair value. For public companies, ASU 2017-04 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The adoption of ASU No. 2017-04 by the Company is not expected to have a material impact. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improv

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The carrying values of investment securities at December 31, 2018 and December 31, 2017 are summarized in the following table (Amounts in Thousands): December 31, 2018 December 31, 2017 Amount Percent Amount Percent Securities available for sale U.S. Treasury $ 83,155 26.07 % $ 54,318 19.05 % Other securities (FHLB, FHLMC and FNMA) 34,871 10.93 % 43,959 15.42 % State and political subdivisions 200,900 63.00 % 186,878 65.53 % Total securities available for sale $ 318,926 100.00 % $ 285,155 100.00 % Investment securities have been classified in the consolidated balance sheets according to management’s intent. Available-for-sale securities consist of debt securities not classified as trading or held to maturity. Available-for-sale securities are stated at fair value, and unrealized holding gains and losses, net of the related deferred tax effect, are reported as a separate component of stockholders’ equity. The Company had no securities designated as trading or held to maturity in its portfolio at December 31, 2018 or 2017 . The carrying amount of available-for-sale securities and their approximate fair values were as follows (Amounts in Thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value December 31, 2018: U.S. Treasury $ 83,839 $ 124 $ (808 ) $ 83,155 Other securities (FHLB, FHLMC and FNMA) 35,371 — (500 ) 34,871 State and political subdivisions 202,450 278 (1,828 ) 200,900 Total $ 321,660 $ 402 $ (3,136 ) $ 318,926 December 31, 2017: U.S. Treasury $ 54,696 $ — $ (378 ) $ 54,318 Other securities (FHLB, FHLMC and FNMA) 44,470 1 (512 ) 43,959 State and political subdivisions 187,130 722 (974 ) 186,878 Total $ 286,296 $ 723 $ (1,864 ) $ 285,155 The amortized cost and estimated fair value of available-for-sale securities classified according to their contractual maturities at December 31, 2018 , were as follows (Amounts in Thousands): Amortized Cost Fair Value Due in one year or less $ 59,118 $ 58,971 Due after one year through five years 182,133 180,663 Due after five years through ten years 79,188 78,064 Due over ten years 1,221 1,228 Total $ 321,660 $ 318,926 As of December 31, 2018 , investment securities with a carrying value of $9.78 million were pledged to collateralize derivative financial instruments and other borrowings. The following table shows the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2018 and 2017 (Amounts in Thousands): Less than 12 months 12 months or more Total 2018 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 6 $ 14,644 $ (49 ) 0.33 % 19 $ 46,443 $ (759 ) 1.63 % 25 $ 61,087 $ (808 ) 1.32 % Other securities (FHLB, FHLMC and FNMA) — — — — % 14 34,871 (500 ) 1.43 % 14 34,871 (500 ) 1.43 % State and political subdivisions 113 31,022 (162 ) 0.52 % 325 77,921 (1,666 ) 2.14 % 438 108,943 (1,828 ) 1.68 % Total temporarily impaired securities 119 $ 45,666 $ (211 ) 0.46 % 358 $ 159,235 $ (2,925 ) 1.84 % 477 $ 204,901 $ (3,136 ) 1.53 % Less than 12 months 12 months or more Total 2017 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 22 $ 54,318 $ (378 ) 0.70 % — $ — $ — — % 22 $ 54,318 $ (378 ) 0.70 % Other securities (FHLB, FHLMC and FNMA) 9 21,411 (83 ) 0.39 % 9 22,547 (429 ) 1.90 % 18 43,958 (512 ) 1.16 % State and political subdivisions 241 58,803 (573 ) 0.97 % 65 14,944 (401 ) 2.68 % 306 73,747 (974 ) 1.32 % Total temporarily impaired securities 272 $ 134,532 $ (1,034 ) 0.77 % 74 $ 37,491 $ (830 ) 2.21 % 346 $ 172,023 $ (1,864 ) 1.08 % The Company considered the following information in reaching the conclusion that the impairments disclosed in the table above are temporary and not other-than-temporary impairments. None of the unrealized losses in the above table was due to the deterioration in credit quality that might result in the non-collection of contractual principal and interest. The unrealized losses are due to changes in interest rates. The Company has not recognized any unrealized loss in income because management does not have the intent to sell the securities included in the previous table. Management has concluded that it is more likely than not that the Company will not be required to sell these securities prior to recovery of the amortized cost basis.

Loans

Loans	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Loans	Loans Classes of loans are as follows: December 31, 2018 2017 (Amounts In Thousands) Agricultural $ 92,673 $ 88,580 Commercial and financial 229,501 218,632 Real estate: Construction, 1 to 4 family residential 72,279 69,738 Construction, land development and commercial 113,807 109,595 Mortgage, farmland 236,454 215,286 Mortgage, 1 to 4 family first liens 912,059 831,591 Mortgage, 1 to 4 family junior liens 152,625 144,200 Mortgage, multi-family 352,434 336,810 Mortgage, commercial 383,314 361,196 Loans to individuals 30,072 26,417 Obligations of state and political subdivisions 52,725 57,626 2,627,943 2,459,671 Net unamortized fees and costs 952 894 2,628,895 2,460,565 Less allowance for loan losses 37,810 29,400 $ 2,591,085 $ 2,431,165 Changes in the allowance for loan losses and the allowance for loan loss balance applicable to impaired loans and the related loan balance of impaired loans for the years ended December 31, 2018 , 2017 and 2016 are as follows: Agricultural Commercial and Financial Real Estate: Construction and land development Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family Real Estate: Mortgage, multi-family and commercial Other Total (Amounts In Thousands) 2018 Allowance for loan losses: Beginning balance $ 2,294 $ 4,837 $ 2,989 $ 3,669 $ 8,668 $ 5,700 $ 1,243 $ 29,400 Charge-offs (95 ) (585 ) — — (830 ) (251 ) (561 ) (2,322 ) Recoveries 119 1,057 148 30 612 107 162 2,235 Provision 471 517 155 273 4,066 2,609 406 8,497 Ending balance $ 2,789 $ 5,826 $ 3,292 $ 3,972 $ 12,516 $ 8,165 $ 1,250 $ 37,810 Ending balance, individually evaluated for impairment $ 479 $ 1,189 $ 4 $ — $ 72 $ 306 $ 64 $ 2,114 Ending balance, collectively evaluated for impairment $ 2,310 $ 4,637 $ 3,288 $ 3,972 $ 12,444 $ 7,859 $ 1,186 $ 35,696 Loan balances: Ending balance $ 92,673 $ 229,501 $ 186,086 $ 236,454 $ 1,064,684 $ 735,748 $ 82,797 $ 2,627,943 Ending balance, individually evaluated for impairment $ 2,460 $ 4,162 $ 1,137 $ 3,612 $ 7,012 $ 9,538 $ 64 $ 27,985 Ending balance, collectively evaluated for impairment $ 90,213 $ 225,339 $ 184,949 $ 232,842 $ 1,057,672 $ 726,210 $ 82,733 $ 2,599,958 Agricultural Commercial and Financial Real Estate: Construction and land development Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family Real Estate: Mortgage, multi-family and commercial Other Total (Amounts In Thousands) 2017 Allowance for loan losses: Beginning balance $ 2,947 $ 4,531 $ 2,890 $ 3,417 $ 7,677 $ 4,045 $ 1,023 $ 26,530 Charge-offs (167 ) (583 ) (114 ) (3 ) (553 ) (130 ) (554 ) (2,104 ) Recoveries 146 1,183 662 — 661 376 258 3,286 Provision (632 ) (294 ) (449 ) 255 883 1,409 516 1,688 Ending balance $ 2,294 $ 4,837 $ 2,989 $ 3,669 $ 8,668 $ 5,700 $ 1,243 $ 29,400 Ending balance, individually evaluated for impairment $ 133 $ 1,018 $ 39 $ 238 $ 66 $ 482 $ 190 $ 2,166 Ending balance, collectively evaluated for impairment $ 2,161 $ 3,819 $ 2,950 $ 3,431 $ 8,602 $ 5,218 $ 1,053 $ 27,234 Loan balances: Ending balance $ 88,580 $ 218,632 $ 179,333 $ 215,286 $ 975,791 $ 698,006 $ 84,043 $ 2,459,671 Ending balance, individually evaluated for impairment $ 4,916 $ 2,768 $ 957 $ 7,962 $ 6,654 $ 8,040 $ 190 $ 31,487 Ending balance, collectively evaluated for impairment $ 83,664 $ 215,864 $ 178,376 $ 207,324 $ 969,137 $ 689,966 $ 83,853 $ 2,428,184 Agricultural Commercial and Financial Real Estate: Construction and land development Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family Real Estate: Mortgage, multi-family and commercial Other Total (Amounts In Thousands) 2016 Allowance for loan losses: Beginning balance $ 3,082 $ 4,517 $ 2,280 $ 3,342 $ 8,172 $ 4,223 $ 894 $ 26,510 Charge-offs (226 ) (315 ) (34 ) (116 ) (1,181 ) (66 ) (693 ) (2,631 ) Recoveries 181 1,169 849 — 1,043 385 187 3,814 Provision (90 ) (840 ) (205 ) 191 (357 ) (497 ) 635 (1,163 ) Ending balance $ 2,947 $ 4,531 $ 2,890 $ 3,417 $ 7,677 $ 4,045 $ 1,023 $ 26,530 Ending balance, individually evaluated for impairment $ 856 $ 718 $ 105 $ 390 $ 90 $ 34 $ 150 $ 2,343 Ending balance, collectively evaluated for impairment $ 2,091 $ 3,813 $ 2,785 $ 3,027 $ 7,587 $ 4,011 $ 873 $ 24,187 Loan balances: Ending balance $ 92,871 $ 192,995 $ 179,425 $ 202,340 $ 892,869 $ 637,029 $ 79,619 $ 2,277,148 Ending balance, individually evaluated for impairment $ 11,720 $ 2,477 $ 1,136 $ 8,028 $ 7,042 $ 3,111 $ 150 $ 33,664 Ending balance, collectively evaluated for impairment $ 81,151 $ 190,518 $ 178,289 $ 194,312 $ 885,827 $ 633,918 $ 79,469 $ 2,243,484 The Company evaluates the following loans to determine impairment: 1) all nonaccrual and TDR loans, 2) all non consumer and non 1 to 4 family residential loans with prior charge-offs, 3) all non consumer and non 1 to 4 family loan relationships classified as substandard and 4) loans with indications of or suspected deteriorating credit quality. The following table presents the credit quality indicators by type of loans in each category as of December 31, 2018 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2018 Grade: Excellent $ 3,667 $ 3,322 $ — $ 209 Good 15,342 51,562 13,029 16,667 Satisfactory 39,897 121,759 42,043 68,123 Monitor 27,510 35,897 15,045 19,888 Special Mention 647 11,418 1,767 7,635 Substandard 5,610 5,543 395 1,285 Total $ 92,673 $ 229,501 $ 72,279 $ 113,807 Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family first liens Real Estate: Mortgage, 1 to 4 family junior liens Real Estate: Mortgage, multi- family 2018 Grade: Excellent $ 5,619 $ 2,715 $ 520 $ 22,058 Good 52,364 33,134 4,569 60,047 Satisfactory 126,706 752,473 138,533 187,641 Monitor 41,486 96,187 6,242 60,398 Special Mention 1,055 10,439 1,130 16,065 Substandard 9,224 17,111 1,631 6,225 Total $ 236,454 $ 912,059 $ 152,625 $ 352,434 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2018 Grade: Excellent $ 34,096 $ — $ 8,117 $ 80,323 Good 86,453 315 15,652 349,134 Satisfactory 177,271 28,797 20,685 1,703,928 Monitor 74,990 647 8,271 386,561 Special Mention 3,228 217 — 53,601 Substandard 7,276 96 — 54,396 Total $ 383,314 $ 30,072 $ 52,725 $ 2,627,943 The following table presents the credit quality indicators by type of loans in each category as of December 31, 2017 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2017 Grade: Excellent $ 2,585 $ 10,264 $ — $ 2,548 Good 15,755 51,620 4,710 27,296 Satisfactory 40,886 116,375 47,995 35,749 Monitor 17,009 29,392 15,188 39,760 Special Mention 6,898 5,576 1,845 3,358 Substandard 5,447 5,405 — 884 Total $ 88,580 $ 218,632 $ 69,738 $ 109,595 Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family first liens Real Estate: Mortgage, 1 to 4 family junior liens Real Estate: Mortgage, multi-family 2017 Grade: Excellent $ 4,751 $ 2,392 $ 489 $ 16,564 Good 54,409 30,094 4,527 75,768 Satisfactory 109,724 689,645 130,451 195,652 Monitor 32,655 76,766 4,881 42,373 Special Mention 5,306 12,072 1,834 — Substandard 8,441 20,622 2,018 6,453 Total $ 215,286 $ 831,591 $ 144,200 $ 336,810 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2017 Grade: Excellent $ 30,355 $ 1 $ 8,794 $ 78,743 Good 98,434 118 30,607 393,338 Satisfactory 179,417 25,445 14,693 1,586,032 Monitor 43,786 500 3,532 305,842 Special Mention 6,303 182 — 43,374 Substandard 2,901 171 — 52,342 Total $ 361,196 $ 26,417 $ 57,626 $ 2,459,671 The below are descriptions of the credit quality indicators: Excellent - Excellent rated loans are prime quality loans covered by highly-liquid collateral with generous margins or supported by superior current financial conditions reflecting substantial net worth, relative to total credit extended, and based on assets of a stable and non-speculative nature whose values can be readily verified. Identified repayment source or cash flow is abundant and assured. Good - Good rated loans are adequately secured by readily-marketable collateral or good financial condition characterized by liquidity, flexibility and sound net worth. Loans are supported by sound primary and secondary payment sources and timely and accurate financial information. Satisfactory – Satisfactory rated loans are loans to borrowers of average financial means not especially vulnerable to changes in economic or other circumstances, where the major support for the extension is sufficient collateral of a marketable nature, and the primary source of repayment is seen to be clear and adequate. Monitor – Monitor rated loans are identified by management as warranting special attention for a variety of reasons that may bear on ultimate collectability. This may be due to adverse trends, a particular industry, loan structure, or repayment that is dependent on projections, or a one-time occurrence. Special Mention – Special mention rated loans are supported by a marginal payment capacity and are marginally protected by collateral. There are identified weaknesses that if not monitored and corrected may adversely affect the Company’s credit position. A special mention credit would typically have a weakness in one of the general categories (cash flow, collateral position or payment history) but not in all categories. Substandard – Substandard loans are not adequately supported by the paying capacity of the borrower and may be inadequately collateralized. These loans have a well-defined weakness or weaknesses. For these loans, it is more probable than not that the Company could sustain some loss if the deficiency(ies) is not corrected. Past due loans as of December 31, 2018 and 2017 were as follows: 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Accruing Loans Past Due 90 Days or More (Amounts In Thousands) December 31, 2018 Agricultural $ 1,026 $ — $ 135 $ 1,161 $ 91,512 $ 92,673 $ — Commercial and financial 988 459 225 1,672 227,829 229,501 — Real estate: Construction, 1 to 4 family residential — — 212 212 72,067 72,279 212 Construction, land development and commercial 233 202 — 435 113,372 113,807 — Mortgage, farmland 193 388 — 581 235,873 236,454 — Mortgage, 1 to 4 family first liens 3,972 833 3,234 8,039 904,020 912,059 158 Mortgage, 1 to 4 family junior liens 199 36 — 235 152,390 152,625 — Mortgage, multi-family — — — — 352,434 352,434 — Mortgage, commercial 733 344 — 1,077 382,237 383,314 — Loans to individuals 195 — 22 217 29,855 30,072 — Obligations of state and political subdivisions — — — — 52,725 52,725 — $ 7,539 $ 2,262 $ 3,828 $ 13,629 $ 2,614,314 $ 2,627,943 $ 370 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Accruing Loans Past Due 90 Days or More (Amounts In Thousands) December 31, 2017 Agricultural $ 324 $ — $ 269 $ 593 $ 87,987 $ 88,580 $ — Commercial and financial 447 20 93 560 218,072 218,632 — Real estate: Construction, 1 to 4 family residential — — — — 69,738 69,738 — Construction, land development and commercial 246 — — 246 109,349 109,595 — Mortgage, farmland 269 — — 269 215,017 215,286 — Mortgage, 1 to 4 family first liens 5,143 1,750 2,939 9,832 821,759 831,591 971 Mortgage, 1 to 4 family junior liens 579 116 — 695 143,505 144,200 — Mortgage, multi-family — — — — 336,810 336,810 — Mortgage, commercial 307 178 16 501 360,695 361,196 — Loans to individuals 206 55 6 267 26,150 26,417 — Obligations of state and political subdivisions — — — — 57,626 57,626 — $ 7,521 $ 2,119 $ 3,323 $ 12,963 $ 2,446,708 $ 2,459,671 $ 971 The Company does not have a significant amount of loans that are past due less than 90 days where there are serious doubts as to the ability of the borrowers to comply with the loan repayment terms. Accruing loans past due 90 days or more decreased $0.60 million from December 31, 2017 to December 31, 2018 . As of December 31, 2018 and 2017 , accruing loans past due 90 days or more were 0.01% and 0.04% of total loans, respectively. The average balance of the accruing loans past due 90 days or more increased in 2018 as compared to 2017 . The average 90 days or more past due accruing loan balance per loan was $0.19 million as of December 31, 2018 compared to $0.12 million as of December 31, 2017 . The loans 90 days or more past due and still accruing are believed to be adequately collateralized. Loans are placed on nonaccrual status when management believes the collection of future principal and interest is not reasonably assured. Certain impaired loan information by loan type at December 31, 2018 and 2017 was as follows: December 31, 2018 December 31, 2017 Nonaccrual loans (1) Accruing loans past due 90 days or more TDR loans Nonaccrual loans (1) Accruing loans past due 90 days or more TDR loans (Amounts In Thousands) (Amounts In Thousands) Agricultural $ 1,338 $ — $ 120 $ 1,651 $ — $ 2,309 Commercial and financial 1,476 — 2,686 825 — 1,943 Real estate: Construction, 1 to 4 family residential — 212 — — — — Construction, land development and commercial — — 328 — — 339 Mortgage, farmland 1,062 — 3,301 1,391 — 1,451 Mortgage, 1 to 4 family first liens 5,799 158 1,143 4,407 971 1,357 Mortgage, 1 to 4 family junior liens — — 24 7 — 25 Mortgage, multi-family 145 — — 218 — — Mortgage, commercial 1,009 — 937 597 — 1,046 Loans to individuals — — — — — — $ 10,829 $ 370 $ 8,539 $ 9,096 $ 971 $ 8,470 (1) There were $4.84 million and $3.62 million of TDR loans included within nonaccrual loans as of December 31, 2018 and 2017 , respectively. The Company may modify the terms of a loan to maximize the collection of amounts due. In most cases, the modification is a reduction in interest rate, conversion to interest only payments or an extension of the maturity date. The borrower is experiencing financial difficulties or is expected to experience financial difficulties in the near-term, so a concessionary modification is granted to the borrower that would otherwise not be considered. TDR loans accrue interest as long as the borrower complies with the revised terms and conditions and has demonstrated repayment performance at a level commensurate with the modified terms over several payment cycles. Below is a summary of information for TDR loans as of December 31, 2018 and 2017 : December 31, 2018 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 5 $ 1,316 $ 91 Commercial and financial 13 3,867 75 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 2 328 — Mortgage, farmland 8 4,291 — Mortgage, 1 to 4 family first liens 16 1,710 — Mortgage, 1 to 4 family junior liens 1 24 — Mortgage, multi-family — — — Mortgage, commercial 9 1,839 — Loans to individuals — — — 54 $ 13,375 $ 166 December 31, 2017 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 9 $ 3,628 $ 321 Commercial and financial 14 2,575 169 Real estate: Construction, 1 to 4 family residential — — 16 Construction, land development and commercial 2 339 — Mortgage, farmland 7 2,761 — Mortgage, 1 to 4 family first liens 13 1,442 — Mortgage, 1 to 4 family junior liens 1 25 24 Mortgage, multi-family — — — Mortgage, commercial 8 1,324 — Loans to individuals — — — 54 $ 12,094 $ 530 A summary of TDR loans that were modified during the year ended December 31, 2018 and 2017 was as follows: December 31, 2018 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 1 $ 163 $ 163 Commercial and financial 6 2,294 2,294 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 1 218 218 Mortgage, farmland 2 4,944 4,944 Mortgage, 1 to 4 family first liens 6 627 627 Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family — — — Mortgage, commercial 2 852 852 Loans to individuals — — — 18 $ 9,098 $ 9,098 December 31, 2017 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 6 $ 10,890 $ 10,890 Commercial and financial 5 2,051 2,051 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 1 231 231 Mortgage, farmland 2 598 598 Mortgage, 1 to 4 family first liens 2 311 311 Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family 1 249 249 Mortgage, commercial — — — Loans to individuals — — — 17 $ 14,330 $ 14,330 The Bank has commitments to lend additional borrowings to TDR loan customers. These commitments are in the normal course of business and allow the borrowers to build pre-sold homes and commercial property which increase their overall cash flow. The additional borrowings are not used to facilitate payments on these loans. There were no TDR loans modified during the year that were in payment default (defined as past due 90 days or more) as of December 31, 2018 or 2017 . Information regarding impaired loans as of and for the year ended December 31, 2018 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2018 With no related allowance recorded: Agricultural $ 1,395 $ 1,663 $ — $ 1,071 $ 23 Commercial and financial 1,650 2,503 — 1,977 58 Real estate: Construction, 1 to 4 family residential 111 148 — 113 — Construction, land development and commercial 328 344 — 333 18 Mortgage, farmland 3,612 4,071 — 3,068 89 Mortgage, 1 to 4 family first liens 6,089 7,819 — 6,435 36 Mortgage, 1 to 4 family junior liens — 254 — — — Mortgage, multi-family 145 213 — 153 — Mortgage, commercial 1,871 2,486 — 1,940 42 Loans to individuals — 14 — — — $ 15,201 $ 19,515 $ — $ 15,090 $ 266 With an allowance recorded: Agricultural $ 1,065 $ 1,229 $ 479 $ 980 $ 7 Commercial and financial 2,512 2,512 1,189 2,793 107 Real estate: Construction, 1 to 4 family residential 698 698 4 622 28 Construction, land development and commercial — — — — — Mortgage, farmland — — — — — Mortgage, 1 to 4 family first liens 899 974 70 888 25 Mortgage, 1 to 4 family junior liens 24 24 2 25 1 Mortgage, multi-family 7,447 7,447 305 7,543 346 Mortgage, commercial 75 75 1 77 4 Loans to individuals 64 64 64 77 9 $ 12,784 $ 13,023 $ 2,114 $ 13,005 $ 527 Total: Agricultural $ 2,460 $ 2,892 $ 479 $ 2,051 $ 30 Commercial and financial 4,162 5,015 1,189 4,770 165 Real estate: Construction, 1 to 4 family residential 809 846 4 735 28 Construction, land development and commercial 328 344 — 333 18 Mortgage, farmland 3,612 4,071 — 3,068 89 Mortgage, 1 to 4 family first liens 6,988 8,793 70 7,323 61 Mortgage, 1 to 4 family junior liens 24 278 2 25 1 Mortgage, multi-family 7,592 7,660 305 7,696 346 Mortgage, commercial 1,946 2,561 1 2,017 46 Loans to individuals 64 78 64 77 9 $ 27,985 $ 32,538 $ 2,114 $ 28,095 $ 793 Information regarding impaired loans as of and for the year ended December 31, 2017 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2017 With no related allowance recorded: Agricultural $ 1,822 $ 2,193 $ — $ 2,044 $ 19 Commercial and financial 1,725 2,487 — 2,080 51 Real estate: Construction, 1 to 4 family residential 114 150 — 116 5 Construction, land development and commercial 338 371 — 344 14 Mortgage, farmland 2,523 2,902 — 2,476 56 Mortgage, 1 to 4 family first liens 6,045 7,507 — 6,286 80 Mortgage, 1 to 4 family junior liens 7 482 — 23 — Mortgage, multi-family 218 355 — 231 — Mortgage, commercial 1,564 2,274 — 1,706 45 Loans to individuals — 14 — — — $ 14,356 $ 18,735 $ — $ 15,306 $ 270 With an allowance recorded: Agricultural $ 3,094 $ 3,149 $ 133 $ 3,526 $ 160 Commercial and financial 1,043 1,043 1,018 1,249 60 Real estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial 505 505 39 321 14 Mortgage, farmland 5,439 5,439 238 5,596 242 Mortgage, 1 to 4 family first liens 577 593 63 585 20 Mortgage, 1 to 4 family junior liens 25 25 3 26 1 Mortgage, multi-family 6,179 6,179 480 6,247 281 Mortgage, commercial 79 79 2 81 4 Loans to individuals 190 190 190 179 20 $ 17,131 $ 17,202 $ 2,166 $ 17,810 $ 802 Total: Agricultural $ 4,916 $ 5,342 $ 133 $ 5,570 $ 179 Commercial and financial 2,768 3,530 1,018 3,329 111 Real estate: Construction, 1 to 4 family residential 114 150 — 116 5 Construction, land development and commercial 843 876 39 665 28 Mortgage, farmland 7,962 8,341 238 8,072 298 Mortgage, 1 to 4 family first liens 6,622 8,100 63 6,871 100 Mortgage, 1 to 4 family junior liens 32 507 3 49 1 Mortgage, multi-family 6,397 6,534 480 6,478 281 Mortgage, commercial 1,643 2,353 2 1,787 49 Loans to individuals 190 204 190 179 20 $ 31,487 $ 35,937 $ 2,166 $ 33,116 $ 1,072 Information regarding impaired loans as of and for the year ended December 31, 2016 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2016 With no related allowance recorded: Agricultural $ 800 $ 971 $ — $ 923 $ — Commercial and financial 1,540 2,175 — 1,662 18 Real estate: Construction, 1 to 4 family residential 117 151 — 131 6 Construction, land development and commercial 204 290 — 207 5 Mortgage, farmland 2,594 2,887 — 2,767 67 Mortgage, 1 to 4 family first liens 5,011 6,137 — 5,265 53 Mortgage, 1 to 4 family junior liens 153 646 — 186 — Mortgage, multi-family 243 362 — 288 — Mortgage, commercial 1,901 2,727 — 1,996 46 Loans to individuals — 19 — — — $ 12,563 $ 16,365 $ — $ 13,425 $ 195 With an allowance recorded: Agricultural $ 10,920 $ 10,978 $ 856 $ 11,258 $ 464 Commercial and financial 937 955 718 777 27 Real estate: Construction, 1 to 4 family residential 815 815 105 537 27 Construction, land development and commercial — — — — — Mortgage, farmland 5,434 5,434 390 5,591 240 Mortgage, 1 to 4 family first liens 1,266 1,374 79 1,226 43 Mortgage, 1 to 4 family junior liens 612 667 11 637 27 Mortgage, multi-family — — — — — Mortgage, commercial 967 1,004 34 986 36 Loans to individuals 150 150 150 151 16 $ 21,101 $ 21,377 $ 2,343 $ 21,163 $ 880 Total: Agricultural $ 11,720 $ 11,949 $ 856 $ 12,181 $ 464 Commercial and financial 2,477 3,130 718 2,439 45 Real estate: Construction, 1 to 4 family residential 932 966 105 668 33 Construction, land development and commercial 204 290 — 207 5 Mortgage, farmland 8,028 8,321 390 8,358 307 Mortgage, 1 to 4 family first liens 6,277 7,511 79 6,491 96 Mortgage, 1 to 4 family junior liens 765 1,313 11 823 27 Mortgage, multi-family 243 362 — 288 — Mortgage, commercial 2,868 3,731 34 2,982 82 Loans to individuals 150 169 150 151 16 $ 33,664 $ 37,742 $ 2,343 $ 34,588 $ 1,075 Impaired loans decreased by $3.50 million from December 31, 2017 to December 31, 2018 . Impaired loans include any loan that has been placed on nonaccrual status, accruing loans past due 90 days or more, TDR loans and specific reserve loans. Impaired loans also include loans that, based on management’s evaluation of current information and events, the Bank expects to be unable to collect in full according to the contractual terms of the original loan agreement. Impaired loans were 1.06% and 1.28% of loans held for investment as of December 31, 2018 and 2017, respectively. The decrease in impaired loans is due mainly to a decrease of $4.70 million in specific reserve loans and a decrease of accruing loans past due 90 days or more of $0.60 million , offset by an increase in nonaccrual loans of $1.73 million and an increase in TDR loans of $0.69 million from December 31, 2017 to December 31, 2018 . For loans that are collateral dependent, losses are evaluated based on the portion of a loan that exceeds the fair market value of the collateral that can be identified as uncollectible. In general, this is the amount that the carrying value of the loan exceeds the related appraised value. Generally, it is the Company’s policy not to rely on appraisals that are older than one year prior to the date the impairment is being measured. The most recent appraisal values may be adjusted if, in the Company’s judgment, experience and other market data indicate that the property’s value, use, condition, exit market or other variable affecting its value may have changed since the appraisal was performed, consistent with the December 2006 joint interagency guidance on the allowance for loan losses. The charge-off or loss adjustment supported by an appraisal is considered the minimum charge-off. Any adjustments made to the appraised value are to provide additional charge-off or loss allocations based on the applicable facts and circumstances. In instances where there is an estimated decline in value, either a loss allocation is provided or a charge-off taken pending confirmation of the amount of the loss from an updated appraisal. Upon receipt of the new appraisals, an additional loss allocation may be provided or charge-off taken based on the appraised value of the collateral. On average, appraisals are obtained within one month of order. The Company has not experienced any significant time lapses in recognizing the required provisions for collateral dependent loans, nor has the Company delayed appropriate charge-offs. When an updated appraisal value has been obtained, the Company has used the appraisal amount in helping to determine the appropriate charge-off or required reserve. The Company also evaluates any changes in the financial condition of the borrower and guarantors (if applicable), economic conditions, and the Company’s loss experience with the type of property in question. Any information utilized in addition to the appraisal is intended to identify additional charge-offs or provisions, not to override the appraised value. The Company separates its portfolio loans and leases into segments for determining the allowance for loan losses. The Company's portfolio segments includes agricultural, commercial and financial, real estate, loans to individuals and obligations of state and political subdivisions. The Company further separates its portfolio into classes for purposes of monitoring and assessing credit quality based on certain risk characteristics. Classes with the real estate portfolio segment includes 1 to 4 family residential constructions, land development and commercial construction, farmland, 1 to 4 family first liens, 1 to 4 family junior liens, multi-family and commercial. Loans that exhibit probable or observed credit weaknesses, as well as loans that have been modified in a TDR, are subject to individual review for impairment. When individual loans are reviewed for impairment, the Company determines allowances based on management's estimate of the borrower's ability to repay the loan given the availability of the collateral, other sources of cash flow, as well as evaluation of legal options available. Allowances for impaired loans are measured based on the present value of expected future cash flows discounted at the loan's effective interest rate or the fair value of the underlying collateral. Historical loss rates are applied to loans that are not individually reviewed for impairment. The 20 quarter migration analysis performed by management uses loan level attributes to track the movement of loans through the various credit risk rating categories in order to estimate the percentage of historical loss to apply to each specific credit risk rating in each loan category. The credit risk rating system currently utilized for allowance analysis purposes encompasses six categories. The Company's allowance for loan loss methodology incorporates a variety of risk considerations, both quantitative and qualitative, in establishing an allowance for loan losses that management believes is appropriate at each reporting date. Quantitative factors include the Company's historical loss experience, delinquency and charge-off trends, collateral values, changes in impaired loans, and other factors. Quantitative factors also incorporate known information about individual loans, including borrowers' sensitivity to interest rate movements. Qualitative factors include changes in lending policies and procedures; changes in national and local economic and business conditions; changes in the nature and volume of the loan portfolio; changes in the experience, ability and depth of lending management and staff; changes in the quality of the Bank's loan review system; the existence and effect of concentrations of credit; and the effect of any other identified external factors. Determinations relating to the possible level of future loan losses are based in part on subjective judgments by management. Future loan losses in excess of current estimates, could materially adversely affect our results of operations or financial position. As the Company adds new products and increases the complexity of its loan portfolio, it will enhance its methodology accordingly. Although management believes the levels of the allowance for loan losses as of December 31, 2018 and 2017 were adequate to absorb probable losses inherent in the loan portfolio, a decline in local economic conditions, or other factors, could result in increasing losses that cannot be reasonably predicted at this time.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment The major classes of property and equipment and the total accumulated depreciation are as follows: December 31, 2018 2017 (Amounts In Thousands) Land $ 10,899 $ 10,880 Buildings and improvements 36,815 36,686 Furniture and equipment 36,090 34,067 83,804 81,633 Less accumulated depreciation 46,753 43,776 Net $ 37,051 $ 37,857

Interest-Bearing Deposits

Interest-Bearing Deposits	12 Months Ended
	Dec. 31, 2018
Interest-bearing Deposit Liabilities [Abstract]
Interest-Bearing Deposits	Interest - Bearing Deposits A summary of these deposits is as follows: December 31, 2018 2017 (Amounts In Thousands) NOW and other demand $ 542,388 $ 520,647 Savings 925,214 907,121 Time, $100,000 and over 350,725 315,558 Other time 230,645 181,422 $ 2,048,972 $ 1,924,748 Brokered deposits totaled $132.46 million and $284.41 million as of December 31, 2018 and 2017 , respectively, with an average interest rate of 2.46% and 1.35% as of December 31, 2018 and 2017 , respectively. Brokered deposits decreased as of December 31, 2018 compared to December 31, 2017 due to passage of the Economic Growth, Regulatory Relief, and Consumer Protection Act which allows reciprocal deposits to be treated as core deposits instead of brokered deposits. As of December 31, 2018, $163.41 million of reciprocal deposits are now treated as core deposits under the Act. As of December 31, 2018 , brokered deposits of $132.46 million are included in savings deposits and $0.00 million are included in time deposits. At December 31, 2017 , brokered deposits of $274.13 million were included in savings deposits and $10.28 million were included in time deposits. Brokered time deposits in increments greater than $100,000 as of December 31, 2018 and 2017 were $0.00 million and $8.57 million , respectively. Time deposits have a maturity as follows: December 31, 2018 2017 (Amounts In Thousands) Due in one year or less $ 229,091 $ 167,471 Due after one year through two years 223,254 90,741 Due after two years through three years 44,610 194,530 Due after three years through four years 35,002 40,140 Due over four years 49,413 4,098 $ 581,370 $ 496,980

Federal Home Loan Bank Borrowin

Federal Home Loan Bank Borrowings	12 Months Ended
	Dec. 31, 2018
Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Borrowings	Federal Home Loan Bank Borrowings As of December 31, 2018 and 2017 , the borrowings were as follows: 2018 2017 (Effective interest rates as of December 31, 2018) (Amounts In Thousands) Due 2018, 3.65% — 20,000 Due 2019, 1.67% — 15,000 Due 2020, 3.05% 25,000 25,000 Due 2021, 2.06% to 2.27% — 30,000 Due 2022, 2.44% — 15,000 Due 2023, 3.77% 25,000 25,000 Due 2024, 2.38% 15,000 15,000 Due 2025, 2.54% to 3.07% 90,000 90,000 Due 2026, 2.52% to 2.86% 30,000 30,000 Due 2027, 2.76% to 2.95% 30,000 30,000 $ 215,000 $ 295,000 On January 17, 2018 the Company paid $15.00 million in FHLB Borrowings due in 2019 and $15.00 million due in 2021. On February 6, 2018 the Company paid $15.00 million in FHLB Borrowings due in 2021. On February 28, 2018 the Company paid $15.00 million in FHLB Borrowings due in 2022. There were no prepayment fees incurred with these prepayments. The remaining borrowings with the FHLB may have prepayment fees based on the current FHLB borrowing rate. To participate in the FHLB advance program, the Company is required to have an investment in FHLB stock. The Company’s investment in FHLB stock was $12.17 million and $15.01 million at December 31, 2018 and 2017 , respectively. Collateral is provided by the Company’s 1 to 4 family mortgage loans totaling $290.25 million at December 31, 2018 and $398.25 million at December 31, 2017 . The Company also has the ability to borrow against agricultural real estate, commercial real estate and multi-family loans totaling $296.53 million as of December 31, 2018 and $298.85 million as of December 31, 2017 and there was $0 borrowed against this collateral as of December 31, 2018 or 2017 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The components of accumulated other comprehensive income (AOCI), included in stockholders’ equity, are as follows: December 31, 2018 2017 (amounts in thousands) Net unrealized loss on available-for-sale securities $ (2,734 ) $ (1,141 ) Net unrealized loss on derivatives used for cash flow hedges (1,596 ) (2,819 ) Tax effect 1,080 1,514 Net-of-tax amount $ (3,250 ) $ (2,446 )

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company has an Employee Stock Purchase Plan (the “ESPP”). For each quarterly offering period, eligible employees can elect to contribute from 1% to 15% of his or her compensation. The purchase price is the lesser of 90% of the fair market value on the first day of the offering period or the last day of the offering period. The maximum dollar amount any one employee can elect to contribute in a year is $9,000 . During the year ended December 31, 2018 , 8,172 shares of stock were purchased by employees of the Bank through the ESPP. 6,892 shares of stock were purchased by employees of the Bank through the ESPP for the year ended December 31, 2017 . The Company has an Employee Stock Ownership Plan (the "ESOP") to which it makes discretionary cash contributions. The Company's contribution to the ESOP totaled $1.05 million , $1.01 million and $0.92 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. The 2018 , 2017 and 2016 discretionary contribution rate was 4.5% of qualified salaries. In the event a terminated plan participant desires to sell his or her shares of the Company stock, or for certain employees who elect to diversify their account balances, the Company may be required to purchase the shares from the participant at their fair value. To the extent that shares of common stock held by the ESOP are not readily traded, a sponsor must reflect the maximum cash obligation related to those securities outside of stockholders' equity. The Company obtains a quarterly independent appraisal of the shares of stock. As of December 31, 2018 and 2017 , the shares held by the ESOP, fair value and maximum cash obligation were as follows: 2018 2017 Shares held by the ESOP 801,147 802,003 Fair value per share $ 61.00 $ 54.00 Maximum cash obligation $ 48,870,000 $ 43,308,000 The Company has a profit-sharing plan with a 401(k) feature, which provides for discretionary annual contributions in amounts to be determined by the Board of Directors. The Company made a 4.50% or $1.05 million contribution to the profit sharing plan contribution for the year ended December 31, 2018 . The Company made a 4.50% or $1.01 million contribution to the profit sharing plan for the year ended December 31, 2017. The Company made a 4.50% or $0.92 million contribution to the profit sharing plan for the year ended December 31, 2016 . The Company made matching contributions under its 401(k) plan of $0.21 million in 2018 , $0.20 million in 2017 , and $0.18 million in 2016 and each such amount is included in salaries and employee benefits expense. The Company provides a deferred compensation program for executive officers. This program allows executive officers to elect to defer a portion of their salaried compensation for payment by the Company at a subsequent date. The executive officers can defer up to 30% of their base compensation and up to 100% of any bonus into the deferral plan. Any amount so deferred is credited to the executive officer’s deferred compensation account and converted to units equivalent in value to the fair market value of a share of stock in Hills Bancorporation. The “stock units” are book entry only and do not represent an actual purchase of stock. The executive officer’s account is adjusted each year for dividends paid and the change in the market value of Hills Bancorporation stock. The deferrals and earnings grow tax deferred until withdrawn from the plan. Earnings credited to the individual’s accounts are recorded as compensation expense when earned. The deferred compensation liability is recorded in other liabilities and totals $5.90 million and $6.34 million at December 31, 2018 and 2017 , respectively. Expense related to the deferred compensation plan was $0.85 million for 2018 , $0.81 million for 2017 and $0.51 million for 2016 and is included in salaries and employee benefits expense. The Company also provides a deferred compensation program for its Board of Directors. Under the plan, each director may elect to defer up to 50% of such director’s cash compensation from retainers and meeting fees for payment by the Company at a subsequent date. Any amount so deferred is credited to the director’s deferred compensation account and converted to units equivalent in value to the fair market value of a share of stock in Hills Bancorporation. The “stock units” are book entry only and do not represent an actual purchase of stock. The director’s account is adjusted each year for dividends paid and the change in the market value of Hills Bancorporation stock. The deferred compensation liability for the directors’ plan is recorded in other liabilities and totaled $3.52 million and $2.95 million at December 31, 2018 and 2017 , respectively. Expense related to the directors’ deferred compensation plan was $0.43 million for 2018 , $0.37 million for 2017 and $0.22 million for 2016 and is included in other noninterest expense. The Company has a Stock Option and Incentive Plan for certain key employees and directors whereby shares of common stock have been reserved for awards in the form of stock options or restricted stock awards. Under the plan, the aggregate number of options and shares granted cannot exceed 188,000 shares. A Stock Option Committee may grant options at prices equal to the fair value of the stock at the date of the grant. Options expire 10 years from the date of the grant. Director options and officers' rights under the plan vest over a five -year period from the date of the grant. The fair value of each option is estimated as of the date of grant using a Black Scholes option pricing model. The expected lives of options granted incorporate historical employee exercise behavior. The risk-free rate for periods that coincide with the expected life of the options is based on the ten year interest rate swap rate as published by the Federal Reserve Bank on the date of issuance. Expected volatility is based on volatility levels of the Company’s peers’ common stock as the Company’s stock has limited trading activity. Expected dividend yield was based on historical dividend rates. There were no stock options granted in 2016, 2017 or 2018. The intrinsic value of options exercised was $0.03 million , $0.24 million and $0.00 million for 2018 , 2017 and 2016 , respectively. A summary of the stock options is as follows: Number of Shares Weighted- Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (In Thousands) Balance, December 31, 2015 19,380 $ 29.92 4.03 $ 580 Granted — Exercised — Balance, December 31, 2016 19,380 $ 29.92 3.03 580 Granted — Exercised (9,160 ) Balance, December 31, 2017 10,220 $ 33.44 4.45 342 Granted — Exercised (1,200 ) Balance, December 31, 2018 9,020 $ 33.30 3.41 $ 250 Other pertinent information related to the options outstanding at December 31, 2018 is as follows: Exercise Price Number Outstanding Remaining Contractual Life Number Exercisable 33.00 7,220 40 months 7,220 34.50 1,800 46 months 1,800 9,020 9,020 As of December 31, 2018 , the outstanding options have a weighted-average exercise price of $33.30 per share and a weighted average remaining contractual term of 3.41 years. As of December 31, 2018 , the vested options totaled 9,020 shares with a weighted-average exercise price of $33.30 per share. As of December 31, 2018 , 38,125 shares were available for stock options and awards. The Compensation and Incentive Stock Committee is also authorized to grant awards of restricted common stock. A summary of the restricted stock option activity for the year ended December 31, 2018 is as follows: Number of Shares Weighted Average Grant Date Fair Value Balance, December 31, 2017 59,728 Granted 24,899 $58.90 Forfeited 3,296 $46.19 Balance, December 31, 2018 38,125 The Company authorized the issuance of 24,899 shares in 2018, 27,407 shares in 2017 , and 23,163 shares in 2016 to certain employees. The vesting period for these awards is five years and the Bank amortizes the expense on a straight line basis during the vesting period. The expense relating to these awards for the years ended December 31, 2018 , 2017 and 2016 was $0.85 million , $0.58 million and $0.56 million , respectively. 15,200 , 15,200 and 10,400 shares of the restricted common stock shares awarded in December 31, 2018 , 2017 and 2016, are subject to forfeiture upon termination of the employee's employment with the Company within eight years of the award.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes for the years ended December 31, 2018 , 2017 and 2016 are summarized as follows: 2018 2017 2016 (Amounts In Thousands) Current: Federal $ 7,783 $ 13,770 $ 11,650 State 3,093 2,529 2,320 Deferred: Federal (1,560 ) 3,426 435 State (411 ) (188 ) (11 ) $ 8,905 $ 19,537 $ 14,394 Temporary differences between the amounts reported in the consolidated financial statements and the tax basis of assets and liabilities result in deferred taxes. Deferred tax assets and liabilities at December 31, 2018 and 2017 were as follows: December 31, 2018 2017 (Amounts In Thousands) Deferred income tax assets: Allowance for loan losses $ 9,434 $ 7,335 Deferred compensation 2,211 2,202 Unrealized losses on interest rate swaps 398 703 Accrued expenses 668 688 State net operating loss 795 836 Unrealized losses on investment securities 682 285 Gross deferred tax assets $ 14,188 $ 12,049 Valuation allowance (795 ) (836 ) Deferred tax asset, net of valuation allowance $ 13,393 $ 11,213 Deferred income tax liabilities: Property and equipment 1,728 1,652 Goodwill 407 407 Other 389 348 Gross deferred tax liabilities $ 2,524 $ 2,407 Net deferred tax assets $ 10,869 $ 8,806 The Company has recorded a deferred tax asset for the future tax benefits of Iowa net operating loss carry-forwards. The net operating loss carry-forwards are generated by the Company largely from its investment in tax credit real estate properties. The Company is required to file a separate Iowa tax return and cannot be consolidated with the Bank. The net operating loss carry-forwards will expire, if not utilized, between 2019 and 2037 . The Company has recorded a valuation allowance to reduce the deferred tax asset attributable to the net operating loss carry-forwards. At December 31, 2018 and 2017 , the Company believes it is more likely than not that the Iowa net operating loss carry-forwards will not be realized. The decrease in net operating loss carry-forward in 2018 compared to 2017 reflects expiring carry-forwards. A valuation allowance related to the remaining deferred tax assets has not been provided because management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the deferred tax assets. The valuation allowance (decreased) increased by ( $41,000 ) and $57,000 for the years ended December 31, 2018 and 2017 , respectively. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cut and Jobs Act (the “Tax Act”). The Tax Act made broad and complex changes to the U.S. tax code that affected 2017, including, but not limited to, accelerated depreciation that allows for full expensing of qualified property. The Tax Act also established new tax laws that affects 2018 and after, including a reduction in the U.S. federal corporate income tax rate from 35% to 21% . On December 22, 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provided guidance on accounting for the tax effects of the Tax Act. SAB 118 provided that a measurement period should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740, Income Taxes. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. As a result of the reduction of the federal corporate income tax rate, we revalued our net deferred tax asset, excluding after tax credits, as of December 22, 2017. Based on this revaluation, we recorded a net tax expense of $4.71 million to reduce the net deferred tax asset balance, which was recorded as additional income tax expense for the year ended December 31, 2017. Our effective tax rate increased by 30.99% to 41.0% primarily as a result of the revaluation of our net deferred tax asset for the year ended December 31, 2017. The net change in the deferred income taxes for the years ended December 31, 2018 , 2017 and 2016 is reflected in the consolidated financial statements as follows: Year Ended December 31, 2018 2017 2016 (Amounts In Thousands) Consolidated statements of income $ 1,971 $ (3,238 ) $ (424 ) Consolidated statements of stockholders' equity 92 (567 ) 1,340 $ 2,063 $ (3,805 ) $ 916 Income tax expense for the years ended December 31, 2018 , 2017 and 2016 are less than the amounts computed by applying the maximum effective federal income tax rate to the income before income taxes because of the following items: 2018 2017 2016 Amount % Of Pretax Income Amount % Of Pretax Income Amount % Of Pretax Income (Amounts In Thousands) Expected tax expense $ 9,591 21.0 % $ 16,659 35.0 % $ 16,082 35.0 % Tax-exempt interest (1,122 ) (2.5 ) (1,771 ) (3.7 ) (1,715 ) (3.7 ) Interest expense limitation 87 0.2 103 0.2 96 0.2 State income taxes, net of federal income tax benefit 2,119 4.6 1,522 3.2 1,501 3.2 Income tax credits (1,292 ) (2.8 ) (1,426 ) (3.0 ) (1,426 ) (3.1 ) Deferred tax asset revaluation — — 4,710 9.9 — — Other (478 ) (1.0 ) (260 ) (0.6 ) (144 ) (0.3 ) $ 8,905 19.5 % $ 19,537 41.0 % $ 14,394 31.3 % Federal income tax expense for the years ended December 31, 2018 , 2017 and 2016 was computed using the consolidated effective federal tax rate. The Company also recognized income tax expense pertaining to state franchise taxes payable individually by the subsidiary bank. The Company files a consolidated tax return for federal purposes and separate tax returns for the State of Iowa purposes. The tax years ended December 31, 2018, 2017, 2016 and 2015 , remain subject to examination by the Internal Revenue Service. For state tax purposes, the tax years ended December 31, 2018, 2017, 2016 and 2015 , remain open for examination. There were no material unrecognized tax benefits at December 31, 2018 and December 31, 2017 . No interest or penalties on these unrecognized tax benefits has been recorded. As of December 31, 2018 , the Company does no t anticipate any significant increase or decrease in unrecognized tax benefits during the twelve month period ending December 31, 2019.

Regulatory Capital Requirements

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions [Abstract]
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions	Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions The Company and the Bank are subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial results. Under capital adequacy guidelines and the regulatory frameworks for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. Capital amounts and classifications of the Company and the Bank are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by the regulations to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of capital. Under the BASEL III rules, the minimum capital ratios are 4% for Tier 1 Leverage Capital Ratio, 4.5% for the Common Equity Tier 1 Capital Ratio, 6% for the Tier 1 Risk-Based Capital Ratio and 8% for the Total Risk-Based Capital Ratio. A new capital conservation buffer is being phased in beginning January 1, 2016, at 0.625% of risk-weighted assets and increased each subsequent year by an additional 0.625% until reaching 2.5% on January 1, 2019. 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. As of December 31, 2018 , the most recent notifications from the Federal Reserve System categorized the Bank as well-capitalized under the regulatory framework for prompt corrective action. To be categorized as well-capitalized, the Bank must maintain minimum total risk-based, Tier 1 risk-based, Tier 1 common equity and Tier 1 leverage ratios as set forth in the table that follows. There are no conditions or events since that notification that management believes have changed the Bank's category. The actual amounts and capital ratios as of December 31, 2018 and 2017 , with the minimum regulatory requirements for the Company and Bank are presented below (amounts in thousands): Actual For Capital Adequacy Purposes To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount Ratio Ratio Ratio As of December 31, 2018: Company: Total risk-based capital $ 414,772 17.18 % 8.00 % 10.00 % Tier 1 risk-based capital 384,502 15.93 6.00 8.00 Tier 1 common equity 384,502 15.93 4.50 6.50 Leverage ratio 384,502 12.68 4.00 5.00 Bank: Total risk-based capital 416,198 17.25 8.00 10.00 Tier 1 risk-based capital 385,943 16.00 6.00 8.00 Tier 1 common equity 385,943 16.00 4.50 6.50 Leverage ratio 385,943 12.73 4.00 5.00 Actual For Capital Adequacy Purposes To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount Ratio Ratio Ratio As of December 31, 2017: Company: Total risk-based capital $ 383,766 16.66 % 8.00 % 10.00 % Tier 1 risk-based capital 354,970 15.41 6.00 8.00 Tier 1 common equity 354,970 15.41 4.50 6.50 Leverage ratio 354,970 12.34 4.00 5.00 Bank: Total risk-based capital 384,181 16.69 8.00 10.00 Tier 1 risk-based capital 355,402 15.44 6.00 8.00 Tier 1 common equity 355,402 15.44 4.50 6.50 Leverage ratio 355,402 12.36 4.00 5.00 The ability of the Company to pay dividends to its stockholders is dependent upon dividends paid by the Bank. The Bank is subject to certain statutory and regulatory restrictions on the amount it may pay in dividends. To maintain acceptable capital ratios in the Bank, certain of its retained earnings are not available for the payment of dividends. To maintain a ratio of capital to assets of 8.00%, retained earnings of $192.92 million as of December 31, 2018 are available for the payment of dividends to the Company. The Bank is required to maintain reserve balances in cash or with the Federal Reserve Bank. Reserve balances totaled $14.68 million and $139.12 million as of December 31, 2018 and 2017 , respectively.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Certain directors of the Company and the Bank, companies with which the directors are affiliated, and certain principal officers are customers of, and have banking transactions with, the Bank in the ordinary course of business. Such indebtedness has been incurred on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons. The following is an analysis of the changes in the loans to related parties during the years ended December 31, 2018 and 2017 : Year Ended December 31, 2018 2017 (Amounts In Thousands) Balance, beginning $ 42,496 $ 30,532 Net increase (decrease) due to change in related parties 188 (59 ) Advances 28,194 28,305 Collections (19,662 ) (16,282 ) Balance, ending $ 51,216 $ 42,496 Deposits from these related parties totaled $7.13 million and $9.24 million as of December 31, 2018 and 2017 , respectively. Deposits from related parties are accepted subject to the same interest rates and terms as those from nonrelated parties.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The carrying value and estimated fair values of the Company’s financial instruments as of December 31, 2018 are as follows: December 31, 2018 Carrying Amount Estimated Fair Value Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) (Amounts In Thousands) Financial instrument assets: Cash and cash equivalents $ 43,305 $ 43,305 $ 43,305 $ — $ — Investment securities 331,098 331,098 83,155 247,943 — Loans held for sale 1,984 1,984 — 1,984 — Loans Agricultural 89,884 93,736 — — 93,736 Commercial and financial 223,675 227,774 — — 227,774 Real estate: Construction, 1 to 4 family residential 70,982 72,419 — — 72,419 Construction, land development and commercial 111,812 112,960 — — 112,960 Mortgage, farmland 232,482 235,771 — — 235,771 Mortgage, 1 to 4 family first liens 902,261 882,908 — — 882,908 Mortgage, 1 to 4 family junior liens 150,859 148,128 — — 148,128 Mortgage, multi-family 348,351 342,099 — — 342,099 Mortgage, commercial 379,232 376,257 — — 376,257 Loans to individuals 29,349 29,962 — — 29,962 Obligations of state and political subdivisions 52,198 51,945 — — 51,945 Accrued interest receivable 11,784 11,784 — 11,784 — Total financial instrument assets $ 2,979,256 $ 2,962,130 $ 126,460 $ 261,711 $ 2,573,959 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 372,152 $ 372,152 $ — $ 372,152 $ — Interest-bearing deposits 2,048,972 2,059,336 — 2,059,336 — Federal Home Loan Bank borrowings 215,000 207,948 — 207,948 — Interest rate swaps 1,596 1,596 — 1,596 — Accrued interest payable 1,812 1,812 — 1,812 — Total financial instrument liabilities $ 2,639,532 $ 2,642,844 $ — $ 2,642,844 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 375,940 $ — $ — $ — $ — Letters of credit 9,033 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 384,973 $ — $ — $ — $ — (1) Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”). (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. The carrying value and estimated fair values of the Company’s financial instruments as of December 31, 2017 are as follows: December 31, 2017 Carrying Amount Estimated Fair Value Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) (Amounts In Thousands) Financial instrument assets: Cash and cash equivalents $ 154,353 $ 154,353 $ 154,353 $ — $ — Investment securities 300,160 300,160 54,318 245,842 — Loans held for sale 5,162 5,162 — 5,162 — Loans Agricultural 86,286 86,229 — — 86,229 Commercial and financial 213,795 212,244 — — 212,244 Real estate: Construction, 1 to 4 family residential 68,545 69,036 — — 69,036 Construction, land development and commercial 107,799 108,651 — — 108,651 Mortgage, farmland 211,617 211,947 — — 211,947 Mortgage, 1 to 4 family first liens 824,222 818,083 — — 818,083 Mortgage, 1 to 4 family junior liens 142,901 142,180 — — 142,180 Mortgage, multi-family 334,019 329,344 — — 329,344 Mortgage, commercial 358,287 353,796 — — 353,796 Loans to individuals 25,635 25,610 — — 25,610 Obligations of state and political subdivisions 57,165 55,066 — — 55,066 Accrued interest receivable 10,772 10,772 — 10,772 — Total financial instrument assets $ 2,900,718 $ 2,882,633 $ 208,671 $ 261,776 $ 2,412,186 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 363,817 $ 363,817 $ — $ 363,817 $ — Interest-bearing deposits 1,924,748 1,934,442 — 1,934,442 — Federal Home Loan Bank Borrowings 295,000 284,442 — 284,442 — Interest rate swaps 2,819 2,819 — 2,819 — Accrued interest payable 1,290 1,290 — 1,290 — Total financial instrument liabilities $ 2,587,674 $ 2,586,810 $ — $ 2,586,810 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 380,877 $ — $ — $ — $ — Letters of credit 9,113 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 389,990 $ — $ — $ — $ — (1) Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”). (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market Fair value of financial instruments : FASB ASC 820, Fair Value Measurements and Disclosures (“ASC 820”) provides a single definition for fair value, a framework for measuring fair value and expanded disclosures concerning fair value. Fair value is defined under ASC 820 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. The Company determines the fair market value of its financial instruments based on the fair value hierarchy established in ASC 820. There are three levels of inputs that may be used to measure fair value as follows: Level 1 Quoted prices in active markets for identical assets or liabilities. Level 2 Observable inputs other than quoted prices included within Level 1. Observable inputs include the quoted prices for similar assets or liabilities in markets that are not active and inputs other than quoted prices that are observable for the asset or liability. Level 3 Unobservable inputs supported by little or no market activity for financial instruments. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. It is the Company’s policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements. The Company is required to use observable inputs, to the extent available, in the fair value estimation process unless that data results from forced liquidations or distressed sales. The following is a description of valuation methodologies used for assets and liabilities recorded at fair value. ASSETS Investment securities available for sale : Investment securities available for sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted prices, if available. If a quoted price is not available, the fair value is obtained from benchmarking the security against similar securities. U.S. Treasury securities are considered Level 1 with the remaining securities considered Level 2. The pricing for investment securities is obtained from an independent source. There are no Level 3 investment securities owned by the Company. The Company obtains an understanding of the independent source’s valuation methodologies used to determine fair value by level of security. The Company validates assigned fair values on a sample basis using an additional third-party provider pricing service to determine if the fair value measurement is reasonable. Due to the nature of our investment portfolio, we do not expect significant and unusual fluctuations as fair value changes primarily relate to interest rate changes. No unusual fluctuations were identified during the year ended December 31, 2018 . If a fluctuation requiring investigation was identified, the Company would research the change with the independent source or other available information. Loans held for sale and Loans : ASU 2016-1, Financial Instruments -Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. This update was effective for financial statement periods beginning after December 15, 2017. Therefore, the fair value presented herein may not be comparable to prior periods. Methodologies utilized for this financial statement period are as follows: •Income Approach: Fair value is determined based on a discounted cash flow analysis. The discounted cash flow analysis was based on the contractual maturity of the loan and market indications of rates, prepayment speeds, defaults and credit risk. •Asset Approach: Fair value is determined based on the estimated values of the underlying collateral or individual analysis of receipts. This provides a better indication of value than the contractual income streams as these loans are not performing or exhibit strong signs indicative of non-performance. Fair value has been estimated in accordance with ASC 820, Fair Value Measurements and Disclosures, and is intended to represent the price that would be received in an orderly transaction between market participants as of the measurement date. In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, at least one significant assumption not observable in the market was utilized. These unobservable assumptions reflect estimates that market participants would use in pricing the asset or liability. Inputs to these valuation techniques are subjective in nature, involve uncertainties and require significant judgment and therefore cannot be determined with precision. Accordingly, the fair value estimates presented are not necessarily indicative of the amounts to be realized in a current market exchange. Loans are classified as Level 3. For the year ended December 31, 2017, fair value was measured using the following methodologies for loans and loans held for sale: Loans held for sale are carried at historical cost. The carrying amount is a reasonable estimate of fair value because of the short time between origination of the loan and its sale on the secondary market (Level 2). The market is active for these loans and as a result prices for similar assets are available. The Company does not record loans at fair value on a recurring basis. For variable-rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values (Level 3). The fair values for other loans are determined using estimated future cash flows, discounted at the interest rates currently being offered for loans with similar terms to borrowers with similar credit quality utilizing an entrance price concept (Level 3). The Company does record nonrecurring fair value adjustments to impaired loans to reflect (1) partial write-downs that are based on the observable market price or appraised value of the collateral or (2) the full charge-off of the loan carrying value (Level 3). These loans are considered Level 3 as the instruments used to determine fair market value require significant management judgment and estimation. A loan is considered to be impaired when it is probable that all of the principal and interest due may not be collected according to its contractual terms. Generally, when a loan is considered impaired, the amount of reserve required under ASC 310, Receivables, is measured based on the fair value of the underlying collateral. The Company makes such measurements on all material loans deemed impaired using the fair value of the collateral for collateral dependent loans. The fair value of collateral used by the Company is determined by obtaining an observable market price or by obtaining an appraised value from an independent, licensed or certified appraiser, using observable market data. This data includes information such as selling price of similar properties and capitalization rates of similar properties sold within the market, expected future cash flows or earnings of the subject property based on current market expectations, and other relevant factors. All appraised values are adjusted for market-related trends based on the Company's experience in sales and other appraisals of similar property types as well as estimated selling costs. Each quarter management reviews all collateral dependent impaired loans on a loan-by-loan basis to determine whether updated appraisals are necessary based on loan performance, collateral type and guarantor support. At times, the Company measures the fair value of collateral dependent impaired loans using appraisals with dates prior to one year from the date of review. These appraisals are discounted by applying current, observable market data about similar property types such as sales contracts, estimations of value by individuals familiar with the market, other appraisals, sales or collateral assessments based on current market activity until updated appraisals are obtained. Depending on the length of time since an appraisal was performed, the data provided through reviews and estimated selling costs, collateral values are typically discounted by 0-35%. Foreclosed assets : The Company does not record foreclosed assets at fair value on a recurring basis. Foreclosed assets consist mainly of other real estate owned but may include other types of assets repossessed by the Company. Foreclosed assets are adjusted to the lower of carrying value or fair value less the costs of disposal. Fair value is generally based upon independent market prices or appraised values of the collateral, and may include a marketability discount as deemed necessary by management based on its experience with similar types of real estate. The value of foreclosed assets is evaluated periodically as a nonrecurring fair value adjustment. Foreclosed assets are classified as Level 3. Off-balance sheet instruments : Fair values for outstanding letters of credit are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties' credit standing. The fair value of the outstanding letters of credit is not significant. Unfunded loan commitments are not valued since the loans are generally priced at market at the time of funding (Level 2). LIABILITIES Interest Rate Swap Agreements : The fair value is estimated using forward-looking interest rate curves and is calculated using discounted cash flows that are observable or that can be corroborated by observable market data (Level 2). Assets and Liabilities Recorded at Fair Value on a Recurring Basis The table below represents the balances of assets and liabilities measured at fair value on a recurring basis: December 31, 2018 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Securities available for sale (Amounts in Thousands) U.S. Treasury $ 83,155 $ — $ — $ 83,155 State and political subdivisions — 200,900 — 200,900 Other securities (FHLB, FHLMC and FNMA) — 34,871 — 34,871 Derivative Financial Instruments Interest rate swaps — (1,596 ) — (1,596 ) Total $ 83,155 $ 234,175 $ — $ 317,330 December 31, 2017 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Securities available for sale (Amounts in Thousands) U.S. Treasury $ 54,318 $ — $ — $ 54,318 State and political subdivisions — 186,878 — 186,878 Other securities (FHLB, FHLMC and FNMA) — 43,959 — 43,959 Derivative Financial Instruments Interest rate swaps — (2,819 ) — (2,819 ) Total $ 54,318 $ 228,018 $ — $ 282,336 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. There were no transfers between Levels 1, 2 or 3 during the years ended December 31, 2018 and 2017 . Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis The Company is required to measure certain assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from application of lower-of-cost-or-market accounting or write-downs of individual assets. The valuation methodologies used to measure these fair value adjustments are described above. For assets measured at fair value on a nonrecurring basis that were still held on the balance sheet at December 31, 2018 and 2017 , the following tables provide the level of valuation assumptions used to determine the adjustment and the carrying value of the related individual assets at year end. December 31, 2018 Year Ended December 31, 2018 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 1,160 $ 1,160 $ 63 Commercial and financial — — 2,882 2,882 122 Real Estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — 703 703 — Mortgage, farmland — — 3,848 3,848 — Mortgage, 1 to 4 family first liens — — 6,729 6,729 520 Mortgage, 1 to 4 family junior liens — — 22 22 60 Mortgage, multi-family — — 7,286 7,286 — Mortgage, commercial — — 1,458 1,458 349 Loans to individuals — — — — — Foreclosed assets (5) — — — — — Total $ — $ — $ 24,088 $ 24,088 $ 1,114 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. (4) Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero. (5) Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets. December 31, 2017 Year Ended December 31, 2017 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 4,704 $ 4,704 $ 127 Commercial and financial — — 1,555 1,555 159 Real Estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — 729 729 — Mortgage, farmland — — 7,190 7,190 — Mortgage, 1 to 4 family first liens — — 5,548 5,548 404 Mortgage, 1 to 4 family junior liens — — 25 25 88 Mortgage, multi-family — — 6,397 6,397 — Mortgage, commercial — — 1,063 1,063 111 Loans to individuals — — — — 20 Foreclosed assets (5) — — — — — Total $ — $ — $ 27,211 $ 27,211 $ 909 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. (4) Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero. (5) Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.

Parent Company Only Financial I

Parent Company Only Financial Information	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Parent Company Only Financial Information	Parent Company Only Financial Information Following is condensed financial information of the Company (parent company only): CONDENSED BALANCE SHEETS December 31, 2018 and 2017 (Amounts In Thousands) ASSETS 2018 2017 Cash and cash equivalents at subsidiary bank $ 3,742 $ 4,015 Investment in subsidiary bank 385,193 355,456 Other assets 1,231 1,393 Total assets $ 390,166 $ 360,864 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities $ 6,414 $ 5,840 Redeemable common stock held by ESOP 48,870 43,308 Stockholders' equity: Capital stock 52,122 48,930 Retained earnings 371,848 341,558 Accumulated other comprehensive loss (3,250 ) (2,446 ) Treasury stock at cost (36,968 ) (33,018 ) 383,752 355,024 Less maximum cash obligation related to ESOP shares 48,870 43,308 Total stockholders' equity 334,882 311,716 Total liabilities and stockholders' equity $ 390,166 $ 360,864 CONDENSED STATEMENTS OF INCOME Years Ended December 31, 2018 , 2017 and 2016 (Amounts In Thousands) 2018 2017 2016 Dividends received from subsidiary $ 11,502 $ 7,485 $ 8,560 Other expenses (786 ) (741 ) (570 ) Income before income tax benefit and equity in undistributed income of subsidiary 10,716 6,744 7,990 Income tax benefit 273 73 292 10,989 6,817 8,282 Equity in undistributed income of subsidiary 25,778 21,244 23,273 Net income $ 36,767 $ 28,061 $ 31,555 CONDENSED STATEMENTS OF CASH FLOWS Years Ended December 31, 2018 , 2017 and 2016 (Amounts In Thousands) 2018 2017 2016 Cash flows from operating activities: Net income $ 36,767 $ 28,061 $ 31,555 Adjustments to reconcile net income to cash and cash equivalents provided by operating activities: Equity in undistributed income of subsidiary (25,778 ) (21,244 ) (23,273 ) Share-based compensation — 11 29 Compensation expensed through issuance of common stock 1,466 1,446 1,078 Excess tax benefits related to share-based compensation — — (70 ) Forfeiture of common stock (152 ) (156 ) (52 ) Decrease (increase) in other assets 162 237 (8 ) Increase in other liabilities 574 3,212 103 Net cash and cash equivalents provided by operating activities 13,039 11,567 9,362 Cash flows from financing activities: Issuance of common stock, net of costs 4,713 3,762 — Stock options exercised 41 238 — Excess tax benefits related to share-based compensation — — 70 Purchase of treasury stock (6,784 ) (2,435 ) (3,926 ) Proceeds from the issuance of common stock through the employee stock purchase plan 421 325 254 Capital contribution to subsidiary (4,700 ) (3,500 ) — Dividends paid (7,003 ) (6,485 ) (6,060 ) Net cash and cash equivalents used by financing activities (13,312 ) (8,095 ) (9,662 ) (Decrease) increase in cash and cash equivalents (273 ) 3,472 (300 ) Cash and cash equivalents: Beginning of year 4,015 543 843 Ending of year $ 3,742 $ 4,015 $ 543

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Concentrations of credit risk : The Bank’s loans, commitments to extend credit, unused lines of credit and outstanding letters of credit have been granted to customers within the Bank's market area. Investments in securities issued by state and political subdivisions within the state of Iowa totaled approximately $97.42 million . The concentrations of credit by type of loan are set forth in Note 3 to the Consolidated Financial Statements. Outstanding letters of credit were granted primarily to commercial borrowers. Although the Bank has a diversified loan portfolio, a substantial portion of its debtors' ability to honor their contracts is dependent upon the economic conditions in Johnson, Linn and Washington Counties, Iowa. Contingencies : In the normal course of business, the Company and Bank are involved in various legal proceedings. In the opinion of management, any liability resulting from such proceedings would not have a material adverse effect on the Consolidated Financial Statements. Financial instruments with off-balance sheet risk : The Bank is a 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, credit card participations and standby letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheets. The Bank’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit, credit card participations and standby letters of credit is represented by the contractual amount of those instruments. The Bank uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. A summary of the Bank’s commitments at December 31, 2018 and 2017 is as follows: 2018 2017 (Amounts In Thousands) Firm loan commitments and unused portion of lines of credit: Home equity loans $ 59,330 $ 55,171 Credit cards 52,802 49,235 Commercial, real estate and home construction 89,171 117,021 Commercial lines and real estate purchase loans 174,637 159,450 Outstanding letters of credit 9,033 9,113 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. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Bank evaluates each customer's credit worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Bank upon extension of credit, is based on management's credit evaluation of the party. Collateral held varies, but may include accounts receivable, crops, livestock, inventory, property and equipment, residential real estate and income-producing commercial properties. Credit card commitments are the unused portion of the holders' credit limits. Such amounts represent the maximum amount of additional unsecured borrowings. Standby letters of credit are conditional commitments issued by the Bank to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements and, generally, have terms of one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. The Bank holds collateral, which may include accounts receivable, inventory, property, equipment, and income-producing properties, supporting those commitments if deemed necessary. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Bank would be required to fund the commitment. The maximum potential amount of future payments the Bank could be required to make is represented by the contractual amount shown in the summary above. If the commitment is funded the Bank would be entitled to seek recovery from the customer. At December 31, 2018 and 2017 , no amounts have been recorded as liabilities for the Bank’s potential obligations under these guarantees. Lease commitments: The Company leases certain facilities under operating leases. The minimum future rental commitments as of December 31, 2018 for all non-cancelable leases relating to Bank premises were as follows: Year ending December 31: (Amounts In Thousands) 2019 $ 464 2020 467 2021 371 2022 315 2023 308 Thereafter 80 $ 2,005 Rent expense was $0.36 million , $0.37 million and $0.36 million for the years ended December 31, 2018 , 2017 and 2016 , respectively.

Quarterly Results of Operations

Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts)	Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts) Quarter Ended March June September December Year 2018 Interest income $ 28,031 $ 29,064 $ 30,411 $ 31,291 $ 118,797 Interest expense 5,738 6,241 6,891 7,453 26,323 Net interest income $ 22,293 $ 22,823 $ 23,520 $ 23,838 $ 92,474 Provision for loan losses (765 ) 711 1,593 6,958 8,497 Other income 5,628 6,234 6,668 5,288 23,818 Other expense 15,256 15,680 15,955 15,232 62,123 Income before income taxes $ 13,430 $ 12,666 $ 12,640 $ 6,936 $ 45,672 Income taxes 2,572 2,603 2,590 1,140 8,905 Net income $ 10,858 $ 10,063 $ 10,050 $ 5,796 $ 36,767 Basic earnings per share $ 1.16 $ 1.07 $ 1.07 $ 0.63 $ 3.93 Diluted earnings per share 1.16 1.07 1.07 0.62 3.92 2017 Interest income $ 25,180 $ 26,133 $ 26,872 $ 27,767 $ 105,952 Interest expense 3,983 4,182 4,652 5,155 17,972 Net interest income $ 21,197 $ 21,951 $ 22,220 $ 22,612 $ 87,980 Provision for loan losses (814 ) 2,511 130 (139 ) 1,688 Other income 5,241 5,001 5,005 5,571 20,818 Other expense 14,411 15,201 14,821 15,079 59,512 Income before income taxes $ 12,841 $ 9,240 $ 12,274 $ 13,243 47,598 Income taxes 3,967 2,783 3,722 9,065 19,537 Net income $ 8,874 $ 6,457 $ 8,552 $ 4,178 $ 28,061 Basic earnings per share $ 0.95 $ 0.69 $ 0.92 $ 0.45 $ 3.01 Diluted earnings per share 0.95 0.69 0.92 0.45 3.01

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments In the normal course of business, the Bank may use derivative financial instruments to manage its interest rate risk. These instruments carry varying degrees of credit, interest rate and market or liquidity risks. Derivative instruments are recognized as either assets or liabilities in the accompanying consolidated financial statements and are measured at fair value. The Bank’s objectives are to add stability to its net interest margin and to manage its exposure to movements in interest rates. The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amount to be exchanged between the counterparties. The Bank is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. The Bank minimizes this risk by entering into derivative contracts with large, stable financial institutions. The Bank has not experienced any losses from nonperformance by counterparties. The Bank monitors counterparty risk in accordance with the provisions of ASC 815. In addition, the Bank’s interest rate-related derivative instruments contain language outlining collateral pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain threshold limits which are determined by credit ratings of each counterparty. The Bank was required to pledge $1.60 million of collateral as of December 31, 2018 . Cash Flow Hedges: The Bank executed two forward-starting interest rate swap transactions on November 7, 2013. One of the interest rate swap transactions had an effective date of November 9, 2015, and an expiration date of November 9, 2020 , effectively converting $25.00 million of variable rate debt to fixed rate debt. The other interest rate swap transaction had an effective date of November 7, 2016 and an expiration date of November 7, 2023 , effectively converting $25.00 million of variable rate debt to fixed rate debt. For accounting purposes, these swap transactions are designated as a cash flow hedge of the changes in cash flows attributable to changes in three-month LIBOR , the benchmark interest rate being hedged, associated with the interest payments made on an amount of the Bank’s debt principal equal to the then-outstanding swap notional amount. At inception, the Bank asserted that the underlying principal balance would remain outstanding throughout the hedge transaction making it probable that sufficient LIBOR-based interest payments would exist through the maturity date of the swaps. The table below identifies the balance sheet category and fair values of the Bank’s derivative instruments designated as cash flow hedges as of December 31, 2018 and 2017 : Notional Amount Fair Value Balance Sheet Category Maturity (Amounts in Thousands) December 31, 2018 Interest rate swap $ 25,000 $ (120 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (1,476 ) Other Liabilities 11/7/2023 December 31, 2017 Interest rate swap $ 25,000 $ (582 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,237 ) Other Liabilities 11/7/2023 The table below identifies the gains and losses recognized on the Bank’s derivative instruments designated as cash flow hedges for the years ended December 31, 2018 and 2017 : Effective Portion Ineffective Portion Recognized in OCI Reclassified from AOCI into Income Recognized in Income on Derivatives Amount of Gain (Loss) Category Amount of Gain (Loss) Category Amount of Gain (Loss) (Amounts in Thousands) December 31, 2018 Interest rate swap $ 347 Interest Expense $ — Other Income $ — Interest rate swap 571 Interest Expense — Other Income — December 31, 2017 Interest rate swap $ 318 Interest Expense $ — Other Income $ — Interest rate swap 373 Interest Expense — Other Income —

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In February 2019, the Company entered into a Letter of Intent to invest in a limited partnership, as limited partner, which will own and operate an affordable housing property in Iowa City, Iowa. The Company will provide construction financing for the project beginning in April 2019 and will contribute capital of $4.18 million upon construction completion which is anticipated to be in 2020. Subsequent events have been evaluated through March 5, 2019.

Nature of Activities and Sign_2

Nature of Activities and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of activities	Nature of activities : Hills Bancorporation (the "Company") is a holding company engaged in the business of commercial banking. The Company's subsidiary is Hills Bank and Trust Company, Hills, Iowa (the “Bank”), which is wholly-owned. The Bank is a full-service commercial bank extending its services to individuals, businesses, governmental units and institutional customers primarily in the communities of Hills, Iowa City, Coralville, North Liberty, Lisbon, Mount Vernon, Kalona, Wellman, Cedar Rapids, Marion and Washington, Iowa. The Bank competes with other financial institutions and non-financial institutions providing similar financial products. Although the loan activity of the Bank is diversified with commercial and agricultural loans, real estate loans, automobile, installment and other consumer loans, the Bank's credit is concentrated in real estate loans. All of the Company’s operations are considered to be one reportable operating segment.
Accounting estimates	Accounting estimates : The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Certain significant estimates	Certain significant estimates : The allowance for loan losses, fair values of securities and other financial instruments, and share-based compensation expense involve certain significant estimates made by management. These estimates are reviewed by management routinely and it is reasonably possible that circumstances that exist at December 31, 2018 may change in the near-term and the effect could be material to the consolidated financial statements.
Principles of consolidation	Principles of consolidation : The consolidated financial statements include the accounts of the Company and its subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation.
Revenue recognition	Revenue recognition :
Cash and cash equivalents	Cash and cash equivalents : The Company considers all investments with original maturities of three months or less to be cash equivalents. At December 31, 2018 and 2017 , cash equivalents consisted primarily of deposits with other banks.
Investment securities	Investment securities : Available-for-sale securities consist of debt securities not classified as trading or held to maturity. Available-for-sale securities are stated at fair value, and unrealized holding gains and losses, net of the related deferred tax effect, are reported as a separate component of stockholders' equity. There were no trading or held to maturity securities as of December 31, 2018 or 2017 . Stock of the Federal Home Loan Bank is carried at cost. The Company has evaluated the stock and determined there is no impairment. Premiums on debt securities are amortized to the earliest call date and discounts on debt securities are accreted over the period to maturity of those securities. The method of amortization results in a constant effective yield on those securities (the interest method). Realized gains and losses on investment securities are included in income, determined on the basis of the cost of the specific securities sold. Declines in the fair value of investment securities available for sale (with certain exceptions for debt securities noted below) that are deemed to be other-than-temporary are charged to earnings as a realized loss, and a new cost basis for the securities is established. In evaluating other-than-temporary impairment, the Company considers the length of time and extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value in the near term. Declines in the fair value of debt securities below amortized cost are deemed to be other-than-temporary in circumstances where: (1) the Company has the intent to sell a security; (2) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell a security or if it is more likely than not that the Company will be required to sell the security before recovery, an other-than-temporary impairment write-down is recognized in earnings equal to the difference between the security’s amortized cost basis and its fair value. If the Company does not intend to sell the security or it is not more likely than not that the Company will be required to sell the security before recovery, the other-than-temporary impairment write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in other comprehensive income. Realized securities gains or losses on securities sales (using specific identification method) and declines in value judged to be other-than-temporary are included in investment securities gains (losses), net, in the consolidated statements of income.
Loans	Loans : Loans are stated at the amount of unpaid principal, reduced by the allowance for loan losses. Interest income is accrued on the unpaid balances as earned. Loans held for sale are stated at the lower of aggregate cost or estimated fair value. Loans are sold on a non-recourse basis with servicing released and gains and losses are recognized based on the difference between sales proceeds and the carrying value of the loan. The Company has had very few experiences of repurchasing loans previously sold into the secondary market. A specific reserve was not considered necessary based on the Company’s historical experience with repurchase activity. The allowance for loan losses is established through a provision for loan losses charged to expense. Loans are charged against the allowance when management believes the collectability of principal is unlikely. The allowance for loan losses is maintained at a level considered adequate to provide for probable losses that can be reasonably anticipated. The allowance is increased by provisions charged to expense and is reduced by net charge-offs. The Bank makes continuous reviews of the loan portfolio and considers current economic conditions, historical loss experience, review of specific problem loans and other factors in determining the adequacy of the allowance. Management classifies loans within the following categories: excellent, good, satisfactory, monitor, special mention and substandard. The policy for charging off loans is consistent throughout all loan categories. A loan is charged off based on criteria that includes but is not limited to: delinquency status, financial condition of the entire customer credit line and underlying collateral coverage, economic or external conditions that might impact full repayment of the loan, legal issues, overdrafts, and the customer’s willingness to work with the Company. Loans are considered impaired when, based on current information and events, it is probable the Bank will not be able to collect all amounts due. An impaired loan includes any loan that has been placed on nonaccrual status, loans greater than 90 days past due and still accruing and TDR loans. They also include loans, based on current information and events, that it is likely the Bank will be unable to collect all amounts due according to the contractual terms of the original loan agreement. The portion of the allowance for loan losses applicable to impaired loans has been computed based on the present value of the estimated future cash flows of interest and principal discounted at the loans effective interest rate or on the fair value of the collateral for collateral dependent loans. The entire change in present value of expected cash flows of impaired loans or of collateral value is reported as provision expense in the same manner in which impairment initially was recognized or as a reduction in the amount of provision expense that otherwise would be reported. Interest income on nonaccrual loans is recognized once principal has been recovered. The accrual of interest income on loans is discontinued when, in the opinion of management, there is reasonable doubt as to the borrower's ability to meet payments of interest or principal when they become due, which is generally when a loan is 90 days or more past due. When a loan is placed on nonaccrual status, all previously accrued and unpaid interest is reversed. Loans are returned to an accrual status when all of the principal and interest amounts contractually due are brought current and repayment of the remaining contractual principal and interest is expected. A loan may also return to accrual status if additional collateral is received from the borrower and, in the opinion of management, the financial position of the borrower indicates that there is no longer any reasonable doubt as to the collection of the amount contractually due. Payment received on nonaccrual loans are applied first to principal. Once principal is recovered, any remaining payments received are applied to interest income. As of December 31, 2018 , none of the Company’s nonaccrual loans were earning interest on a cash basis. Nonrefundable loan fees and origination costs are deferred and recognized as a yield adjustment over the life of the related loan.
Troubled debt restructurings (TDR loans)	Troubled debt restructurings (“TDR loans”) : A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that leads to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses to the Company. A loan that is modified at a market rate of interest is no longer classified as troubled debt restructuring in the quarter following the modification if the borrower is no longer experiencing financial difficulties. Performance prior to the restructuring is considered when assessing whether the borrower can meet the new terms. At the time of restructuring, loans included in a troubled debt restructuring may be considered nonaccrual loans. TDR loans are returned to accrual status under the same criteria noted under loans above.
Transfers of financial assets	Transfers of financial assets : Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
Credit related financial instruments	Credit related financial instruments : In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit and standby letters of credit. Such financial instruments are recorded when they are funded.
Tax credit real estate	Tax credit real estate : Tax credit real estate represents two multi-family rental properties, three assisted living rental properties, a multi-tenant rental property for persons with disabilities, and a multi-family senior living rental property, all which are affordable housing projects as of December 31, 2018 . The Bank has a 99% or greater limited partnership interest in each limited partnership. The investment in each was completed after the projects had been developed by the general partner. The Company evaluates the recoverability of the carrying value on a regular basis. If the recoverability was determined to be in doubt, a valuation allowance would be established by way of a charge to expense. Depreciation expense is provided on a straight-line basis over the estimated useful life of the assets. Expenditures for normal repairs and maintenance are charged to expense as incurred. In 2016, the Company adopted ASU 2015-02 and the investments in tax credit real estate are recorded for the years ended December 31, 2018, 2017 and 2016 using the equity method of accounting. The operations of the properties are not expected to contribute significantly to the Company’s income before income taxes. However, the properties do contribute in the form of income tax credits, which lowers the Company’s effective tax rate. Once established, the credits on each property last for ten years and are passed through from the limited partnerships to the Bank and reduces the consolidated federal tax liability of the Company.
Property and equipment	Property and equipment : Property and equipment is stated at cost less accumulated depreciation. Depreciation is computed using primarily declining-balance methods over the estimated useful lives of 7-40 years for buildings and improvements and 3-10 years for furniture and equipment.
Deferred income taxes	Deferred income taxes : Deferred income taxes are provided under the asset and liability method whereby deferred tax assets are recognized for deductible temporary differences and net operating loss, and tax credit carryforwards and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax bases. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are adjusted for the effects of changes in tax laws and rates on the date of enactment. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. Interest and penalties on unrecognized tax benefits are classified as other noninterest expense. As of December 31, 2018 , the Company had no material unrecognized tax benefits.
Goodwill	Goodwill : Goodwill represents the excess of cost over the fair value of the net assets acquired, and is not subject to amortization, but requires, at a minimum, annual impairment tests for intangibles that are determined to have an indefinite life.
Other real estate	Other real estate : Other real estate represents property acquired through foreclosures and settlements of loans. Property acquired is carried at the lower of the principal amount of the loan outstanding at the time of acquisition, plus any acquisition costs, or the estimated fair value of the property, less disposal costs. The Bank will obtain updated appraisals to determine the estimated fair value of the property based on the type of collateral securing the loan and the date of the latest appraisal. Subsequent write downs estimated on the basis of later valuations are charged to net loss on sale of other real estate owned and other repossessed assets. Net operating expenses incurred in maintaining such properties are charged to other non-interest expense. Net capital expenditures incurred are capitalized to the property. In 2017, the Company revised its reporting to include other real estate with other assets.
Derivative financial instruments	Derivative financial instruments : The Bank uses interest rate swaps as part of its interest rate risk management. Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 815 establishes accounting and reporting standards for derivative instruments and hedging activities. The Bank records all interest rate swaps on the balance sheet at fair value. Derivatives used to hedge the exposure to variability in expected future cash flows are considered cash flow hedges. To qualify for hedge accounting, the Bank must comply with the detailed rules and documentation requirements at the inception of the hedge, and hedge effectiveness is assessed at inception and periodically throughout the life of the hedging relationship. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivatives is initially reported in other comprehensive income and subsequently reclassified to interest income or expense when the hedged transaction affects earnings, while the ineffective portion of changes in fair value of the derivative, if any, is recognized immediately in other noninterest income or expense. The Bank assesses the effectiveness of each hedging relationship by comparing the cumulative changes in cash flows of the derivative hedging instruments with the cumulative changes in cash flows of the designated hedged item or transaction. No component of the change in the fair value of the hedging instrument is excluded from the assessment of hedge effectiveness. The Bank does not use derivatives for trading or speculative purposes.
Earnings per share	Earnings per share: Basic earnings per share is computed using the weighted average number of actual common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that would occur from the exercise of common stock options outstanding. ESOP shares are considered outstanding for this calculation unless unearned.
Stock awards and options	Stock awards and options : Compensation expense for stock issued through the stock award plan is accounted for using the fair value method prescribed by FASB ASC 718, “Share-Based Payment” (“ASC 718”). Under this method, compensation expense is measured and recognized for all stock-based awards made to employees and directors based on the fair value of each award as of the date of the grant.
Common stock held by ESOP	Common stock held by ESOP : The Company's maximum cash obligation related to these shares is classified outside stockholders' equity because the shares are not readily traded and could be put to the Company for cash.
Treasury Stock	Treasury Stock : Treasury stock is accounted for by the cost method, whereby shares of common stock reacquired are recorded at their purchase price.
Trust Department Assets	Trust Department Assets : Property held for customers in fiduciary or agency capacities is not included in the accompanying consolidated balance sheets, as such items are not assets of the Company.
Effect of New Financial Accounting Standards	Effect of New Financial Accounting Standards : In May 2014, The FASB and International Accounting Standards Board (IASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of ASU 2014-09 is that a company 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 and services. ASU 2014-09 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. The Company has evaluated all of its noninterest income streams and contracts to determine potential impact. The adoption of ASU 2014-09 by the Company did not have a material impact on the recognition of revenue though did require additional disclosures on our material noninterest income streams discussed in revenue recognition above. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 created Subtopic 321-10, Investments-Equity Securities which is applicable to all entities except those in industries that account for substantially all investments at fair value through earnings or the change in net assets. Under this new subtopic, equity securities are generally required to be measured at fair value with unrealized holding gains and losses reflected in net income. ASU 2016-01 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2017. The Company adopted ASU 2016-01 for the period ending March 31, 2018. There was no material impact on the financial statements, however, it required the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes and eliminated the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. The revised disclosures are in Note 12 Fair Value Measurements. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases . The ASU provides guidance requiring lessees to recognize right-of-use (ROU) assets and lease liabilities for all leases other than those that meet the definition of short-term leases. For short-term leases, lessees may elect an accounting policy by class of underlying asset under which these assets and liabilities are not recognized and lease payments are generally recognized over the lease term on a straight-line basis. Under this new ASU, lessees will recognize right-of use assets and lease liabilities for most leases currently accounted for as operating leases under generally accepted accounting principles. For public companies, ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. The Company adopted the ASU on January 1, 2019 and used the effective date as the date of initial application. Consequently, financial information will not be updated and the disclosures required under the new standard will not be provided for dates and periods before January 1, 2019. The new standard provides a number of optional practical expedients in transition. We elected the 'package of practical expedients', which permits us not to reassess under the new standard our prior conclusions about lease identification, lease classification and initial direct costs. We did not elect the use-of-hindsight or the practical expedient pertaining to land easements; the latter not being applicable to us. The most significant impact upon adoption relates to the recognition of new ROU assets and lease liabilities on our balance sheet for our equipment and real estate operating leases. Upon adoption, we recognized additional operating liabilities of $3.58 million, with corresponding ROU assets of the same amount based on the present value of the remaining minimum rental payments under current leasing standards for existing operating leases. In March 2016, the FASB issued ASU No. 2016-04, Liabilities - Extinguishments of Liabilities (Subtopic 405-20), Recognition of Breakage for Certain Prepaid Stored-Value Products . ASU 2016-04 applies to all entities that offer certain prepaid stored - value products. The ASU provides guidance for the derecognition of financial liabilities related to the issuance of these products and aligns the recognition of breakage to current authoritative guidance. For public companies, ASU 2016-04 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. The Company adopted ASU 2016-04 for the period ending March 31, 2018. There was no material impact on the financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments (CECL) . The ASU changes the way entities recognize impairment of financial assets by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets. Under the CECL model, we will be required to present certain financial assets carried at amortized cost, such as loans held for investment and held-to-maturity debt securities, at the net amount expected to be collected. The measurement of expected credit losses is to be based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This measurement will take place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the "incurred loss" model required under current GAAP, which delays recognition until it is probable a loss has been incurred. Accordingly, we expect that the adoption of the CECL model will materially affect how we determine our allowance for loan losses and could require us to significantly increase our allowance. For public companies, ASU 2016-13 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, early adoption is permitted for the fiscal year beginning after December 15, 2018. The Company has implemented a software solution to assist in the analysis of historical loan data to determine the CECL model that will be implemented. The Company anticipates running parallel calculations of the "incurred loss" and CECL models for the quarter ending March 31, 2019. We expect to recognize a one-time cumulative-effect adjustment to our allowance for loan losses as of the beginning of the first reporting period in which the new standard is adopted. The amount of the one-time cumulative-effect adjustment has not yet been determined. In January 2017, the FASB issued ASU No. 2017-03, Accounting Changes and Error Corrections (Topic 250) and Investments - Equity Method and Joint Ventures (Topic 323), Amendments to SEC Paragraphs Pursuant to Staff Announcements at the September 22, 2016 and November 17, 2016 EITF Meetings. This ASU adds an SEC paragraph and amends other Topics pursuant to an SEC staff Announcement made at the September 22, 2016 Emerging Issues Task Force (EITF) meeting. The SEC paragraph applies to ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606); ASU No. 2016-02, Leases (Topic 842); and ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU provides that a company should evaluate ASUs that have not yet been adopted to determine the appropriate financial statement disclosures about the potential material effects of those ASUs on the financial statements when adopted. If the company does not know or cannot reasonably estimate the impact that adoption of the ASUs referenced in this announcement is expected to have on the financial statements, then in addition to making a statement to that effect, the company should consider additional qualitative financial statement disclosures to assist the reader in assessing the significance of the impact that the standard will have on the financial statements of the company when adopted. Additional qualitative disclosures should include a description of the effect of the accounting policies that the company expects to apply and a comparison to the company's current accounting policies. Also, the company should describe the status of its process to implement the new standards and the significant implementation matters yet to be addressed. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 250), Simplifying the Test for Goodwill Impairment. The ASU simplifies the goodwill impairment test by requiring a company to perform its annual or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized when the carrying amount exceeds fair value. For public companies, ASU 2017-04 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The adoption of ASU No. 2017-04 by the Company is not expected to have a material impact. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815), Targeted Improvements to Accounting for Hedging Activities. This ASU requires companies to change the recognition and presentation of the effects of hedge accounting by eliminating the requirement to separately measure and report hedge ineffectiveness and requiring companies to present all of the elements of hedge accounting that affect earnings in the same income statement line as the hedged item. Furthermore, the standard eases the requirements for effectiveness testing, hedge documentation and applying the critical terms match method and introduces new alternatives that will permit companies to reduce the risk of material error corrections if they misapply the shortcut method. For public companies, ASU 2017-12 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2018. The adoption of ASU 2017-12 by the Company is not expected to have a material impact. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220), Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. ASU 2018-02 is effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. The Company adopted ASU 2018-02 for the period ending March 31, 2018 and elected the specific identification method accounting policy. There was a $0.53 million reclassification recorded in stockholders' equity. In June 2018, the FASB issued ASU No. 2018-07, Compensation - Stock Compensation (Topic 718), Improvements to Nonemployee Share-Based Payment Accounting . The amendments in this ASU expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. ASU 2018-07 is effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. The adoption of ASU 2018-07 by the Company is not expected to have a material impact. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820), Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . The amendments in this ASU modify the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, including removal of the requirement to disclose the valuation processes for Level 3 fair value measurements and the additional requirement to disclose the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. ASU 2018-13 is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. Early adoption is permitted upon issuance of this ASU. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this ASU and delay adoption of the additional disclosures until their effective date. The adoption of ASU 2018-13 by the Company is not expected to have a material impact. In August 2018, the FASB issued ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangements That Is a Service Contract . The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). ASU 2018-15 is effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption of the amendments in this ASU is permitted, including adoption in any interim period, for all entities. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is in the process of evaluating the impact of this ASU on the financial statements. In October 2018, the FASB issued ASU No. 2018-16, Derivatives and Hedging (Topic 815), Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes . The amendments in this ASU permit use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the interest rates on direct Treasury obligations of the U.S. government, the London Interbank Offered Rate (LIBOR) swap rate, the Overnight Index Swap (OIS) Rate based on the Fed Funds Effective Rate and the Securities Industry and Financial Markets Association (SIFMA) Municipal Swap Rate. The amendments in this ASU are required to be adopted concurrently with the amendments in ASU 2017-12. For public companies, this would be for fiscal years, and interim periods within those fiscal years beginning after December 15, 2018. The adoption of ASU 2018-16 by the Company is not expected to have a material impact.

Nature of Activities and Sign_3

Nature of Activities and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Calculations of earnings per share	The following table presents calculations of earnings per share: Year Ended December 31, 2018 2017 2016 (Amounts In Thousands, except share and per share data) Computation of weighted average number of basic and diluted shares: Common shares outstanding at the beginning of the year 9,335,154 9,264,227 9,322,054 Weighted average number of net shares issued (redeemed) 31,160 65,776 (34,965 ) Weighted average shares outstanding (basic) 9,366,314 9,330,003 9,287,089 Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method 4,027 4,632 6,445 Weighted average number of shares (diluted) 9,370,341 9,334,635 9,293,534 Net income $ 36,767 $ 28,061 $ 31,555 Earnings per share: Basic $ 3.93 $ 3.01 $ 3.40 Diluted $ 3.92 $ 3.01 $ 3.40

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Carrying values of investment securities	The carrying values of investment securities at December 31, 2018 and December 31, 2017 are summarized in the following table (Amounts in Thousands): December 31, 2018 December 31, 2017 Amount Percent Amount Percent Securities available for sale U.S. Treasury $ 83,155 26.07 % $ 54,318 19.05 % Other securities (FHLB, FHLMC and FNMA) 34,871 10.93 % 43,959 15.42 % State and political subdivisions 200,900 63.00 % 186,878 65.53 % Total securities available for sale $ 318,926 100.00 % $ 285,155 100.00 %
Carrying amount of available-for-sale securities and approximate fair values	The carrying amount of available-for-sale securities and their approximate fair values were as follows (Amounts in Thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value December 31, 2018: U.S. Treasury $ 83,839 $ 124 $ (808 ) $ 83,155 Other securities (FHLB, FHLMC and FNMA) 35,371 — (500 ) 34,871 State and political subdivisions 202,450 278 (1,828 ) 200,900 Total $ 321,660 $ 402 $ (3,136 ) $ 318,926 December 31, 2017: U.S. Treasury $ 54,696 $ — $ (378 ) $ 54,318 Other securities (FHLB, FHLMC and FNMA) 44,470 1 (512 ) 43,959 State and political subdivisions 187,130 722 (974 ) 186,878 Total $ 286,296 $ 723 $ (1,864 ) $ 285,155
Available-for-sale securities classified as per contractual maturities	The amortized cost and estimated fair value of available-for-sale securities classified according to their contractual maturities at December 31, 2018 , were as follows (Amounts in Thousands): Amortized Cost Fair Value Due in one year or less $ 59,118 $ 58,971 Due after one year through five years 182,133 180,663 Due after five years through ten years 79,188 78,064 Due over ten years 1,221 1,228 Total $ 321,660 $ 318,926
Available-for-sale securities, continuous unrealized loss position, fair value	The following table shows the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2018 and 2017 (Amounts in Thousands): Less than 12 months 12 months or more Total 2018 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 6 $ 14,644 $ (49 ) 0.33 % 19 $ 46,443 $ (759 ) 1.63 % 25 $ 61,087 $ (808 ) 1.32 % Other securities (FHLB, FHLMC and FNMA) — — — — % 14 34,871 (500 ) 1.43 % 14 34,871 (500 ) 1.43 % State and political subdivisions 113 31,022 (162 ) 0.52 % 325 77,921 (1,666 ) 2.14 % 438 108,943 (1,828 ) 1.68 % Total temporarily impaired securities 119 $ 45,666 $ (211 ) 0.46 % 358 $ 159,235 $ (2,925 ) 1.84 % 477 $ 204,901 $ (3,136 ) 1.53 % Less than 12 months 12 months or more Total 2017 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 22 $ 54,318 $ (378 ) 0.70 % — $ — $ — — % 22 $ 54,318 $ (378 ) 0.70 % Other securities (FHLB, FHLMC and FNMA) 9 21,411 (83 ) 0.39 % 9 22,547 (429 ) 1.90 % 18 43,958 (512 ) 1.16 % State and political subdivisions 241 58,803 (573 ) 0.97 % 65 14,944 (401 ) 2.68 % 306 73,747 (974 ) 1.32 % Total temporarily impaired securities 272 $ 134,532 $ (1,034 ) 0.77 % 74 $ 37,491 $ (830 ) 2.21 % 346 $ 172,023 $ (1,864 ) 1.08 %

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2018
Receivables [Abstract]
Schedule of classes of loans	Classes of loans are as follows: December 31, 2018 2017 (Amounts In Thousands) Agricultural $ 92,673 $ 88,580 Commercial and financial 229,501 218,632 Real estate: Construction, 1 to 4 family residential 72,279 69,738 Construction, land development and commercial 113,807 109,595 Mortgage, farmland 236,454 215,286 Mortgage, 1 to 4 family first liens 912,059 831,591 Mortgage, 1 to 4 family junior liens 152,625 144,200 Mortgage, multi-family 352,434 336,810 Mortgage, commercial 383,314 361,196 Loans to individuals 30,072 26,417 Obligations of state and political subdivisions 52,725 57,626 2,627,943 2,459,671 Net unamortized fees and costs 952 894 2,628,895 2,460,565 Less allowance for loan losses 37,810 29,400 $ 2,591,085 $ 2,431,165
Schedule of changes in allowance for loan losses	Changes in the allowance for loan losses and the allowance for loan loss balance applicable to impaired loans and the related loan balance of impaired loans for the years ended December 31, 2018 , 2017 and 2016 are as follows: Agricultural Commercial and Financial Real Estate: Construction and land development Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family Real Estate: Mortgage, multi-family and commercial Other Total (Amounts In Thousands) 2018 Allowance for loan losses: Beginning balance $ 2,294 $ 4,837 $ 2,989 $ 3,669 $ 8,668 $ 5,700 $ 1,243 $ 29,400 Charge-offs (95 ) (585 ) — — (830 ) (251 ) (561 ) (2,322 ) Recoveries 119 1,057 148 30 612 107 162 2,235 Provision 471 517 155 273 4,066 2,609 406 8,497 Ending balance $ 2,789 $ 5,826 $ 3,292 $ 3,972 $ 12,516 $ 8,165 $ 1,250 $ 37,810 Ending balance, individually evaluated for impairment $ 479 $ 1,189 $ 4 $ — $ 72 $ 306 $ 64 $ 2,114 Ending balance, collectively evaluated for impairment $ 2,310 $ 4,637 $ 3,288 $ 3,972 $ 12,444 $ 7,859 $ 1,186 $ 35,696 Loan balances: Ending balance $ 92,673 $ 229,501 $ 186,086 $ 236,454 $ 1,064,684 $ 735,748 $ 82,797 $ 2,627,943 Ending balance, individually evaluated for impairment $ 2,460 $ 4,162 $ 1,137 $ 3,612 $ 7,012 $ 9,538 $ 64 $ 27,985 Ending balance, collectively evaluated for impairment $ 90,213 $ 225,339 $ 184,949 $ 232,842 $ 1,057,672 $ 726,210 $ 82,733 $ 2,599,958 Agricultural Commercial and Financial Real Estate: Construction and land development Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family Real Estate: Mortgage, multi-family and commercial Other Total (Amounts In Thousands) 2017 Allowance for loan losses: Beginning balance $ 2,947 $ 4,531 $ 2,890 $ 3,417 $ 7,677 $ 4,045 $ 1,023 $ 26,530 Charge-offs (167 ) (583 ) (114 ) (3 ) (553 ) (130 ) (554 ) (2,104 ) Recoveries 146 1,183 662 — 661 376 258 3,286 Provision (632 ) (294 ) (449 ) 255 883 1,409 516 1,688 Ending balance $ 2,294 $ 4,837 $ 2,989 $ 3,669 $ 8,668 $ 5,700 $ 1,243 $ 29,400 Ending balance, individually evaluated for impairment $ 133 $ 1,018 $ 39 $ 238 $ 66 $ 482 $ 190 $ 2,166 Ending balance, collectively evaluated for impairment $ 2,161 $ 3,819 $ 2,950 $ 3,431 $ 8,602 $ 5,218 $ 1,053 $ 27,234 Loan balances: Ending balance $ 88,580 $ 218,632 $ 179,333 $ 215,286 $ 975,791 $ 698,006 $ 84,043 $ 2,459,671 Ending balance, individually evaluated for impairment $ 4,916 $ 2,768 $ 957 $ 7,962 $ 6,654 $ 8,040 $ 190 $ 31,487 Ending balance, collectively evaluated for impairment $ 83,664 $ 215,864 $ 178,376 $ 207,324 $ 969,137 $ 689,966 $ 83,853 $ 2,428,184 Agricultural Commercial and Financial Real Estate: Construction and land development Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family Real Estate: Mortgage, multi-family and commercial Other Total (Amounts In Thousands) 2016 Allowance for loan losses: Beginning balance $ 3,082 $ 4,517 $ 2,280 $ 3,342 $ 8,172 $ 4,223 $ 894 $ 26,510 Charge-offs (226 ) (315 ) (34 ) (116 ) (1,181 ) (66 ) (693 ) (2,631 ) Recoveries 181 1,169 849 — 1,043 385 187 3,814 Provision (90 ) (840 ) (205 ) 191 (357 ) (497 ) 635 (1,163 ) Ending balance $ 2,947 $ 4,531 $ 2,890 $ 3,417 $ 7,677 $ 4,045 $ 1,023 $ 26,530 Ending balance, individually evaluated for impairment $ 856 $ 718 $ 105 $ 390 $ 90 $ 34 $ 150 $ 2,343 Ending balance, collectively evaluated for impairment $ 2,091 $ 3,813 $ 2,785 $ 3,027 $ 7,587 $ 4,011 $ 873 $ 24,187 Loan balances: Ending balance $ 92,871 $ 192,995 $ 179,425 $ 202,340 $ 892,869 $ 637,029 $ 79,619 $ 2,277,148 Ending balance, individually evaluated for impairment $ 11,720 $ 2,477 $ 1,136 $ 8,028 $ 7,042 $ 3,111 $ 150 $ 33,664 Ending balance, collectively evaluated for impairment $ 81,151 $ 190,518 $ 178,289 $ 194,312 $ 885,827 $ 633,918 $ 79,469 $ 2,243,484
Schedule of credit quality indicators by type of loans	The following table presents the credit quality indicators by type of loans in each category as of December 31, 2018 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2018 Grade: Excellent $ 3,667 $ 3,322 $ — $ 209 Good 15,342 51,562 13,029 16,667 Satisfactory 39,897 121,759 42,043 68,123 Monitor 27,510 35,897 15,045 19,888 Special Mention 647 11,418 1,767 7,635 Substandard 5,610 5,543 395 1,285 Total $ 92,673 $ 229,501 $ 72,279 $ 113,807 Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family first liens Real Estate: Mortgage, 1 to 4 family junior liens Real Estate: Mortgage, multi- family 2018 Grade: Excellent $ 5,619 $ 2,715 $ 520 $ 22,058 Good 52,364 33,134 4,569 60,047 Satisfactory 126,706 752,473 138,533 187,641 Monitor 41,486 96,187 6,242 60,398 Special Mention 1,055 10,439 1,130 16,065 Substandard 9,224 17,111 1,631 6,225 Total $ 236,454 $ 912,059 $ 152,625 $ 352,434 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2018 Grade: Excellent $ 34,096 $ — $ 8,117 $ 80,323 Good 86,453 315 15,652 349,134 Satisfactory 177,271 28,797 20,685 1,703,928 Monitor 74,990 647 8,271 386,561 Special Mention 3,228 217 — 53,601 Substandard 7,276 96 — 54,396 Total $ 383,314 $ 30,072 $ 52,725 $ 2,627,943 The following table presents the credit quality indicators by type of loans in each category as of December 31, 2017 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2017 Grade: Excellent $ 2,585 $ 10,264 $ — $ 2,548 Good 15,755 51,620 4,710 27,296 Satisfactory 40,886 116,375 47,995 35,749 Monitor 17,009 29,392 15,188 39,760 Special Mention 6,898 5,576 1,845 3,358 Substandard 5,447 5,405 — 884 Total $ 88,580 $ 218,632 $ 69,738 $ 109,595 Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family first liens Real Estate: Mortgage, 1 to 4 family junior liens Real Estate: Mortgage, multi-family 2017 Grade: Excellent $ 4,751 $ 2,392 $ 489 $ 16,564 Good 54,409 30,094 4,527 75,768 Satisfactory 109,724 689,645 130,451 195,652 Monitor 32,655 76,766 4,881 42,373 Special Mention 5,306 12,072 1,834 — Substandard 8,441 20,622 2,018 6,453 Total $ 215,286 $ 831,591 $ 144,200 $ 336,810 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2017 Grade: Excellent $ 30,355 $ 1 $ 8,794 $ 78,743 Good 98,434 118 30,607 393,338 Satisfactory 179,417 25,445 14,693 1,586,032 Monitor 43,786 500 3,532 305,842 Special Mention 6,303 182 — 43,374 Substandard 2,901 171 — 52,342 Total $ 361,196 $ 26,417 $ 57,626 $ 2,459,671
Schedule of past due loans	Past due loans as of December 31, 2018 and 2017 were as follows: 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Accruing Loans Past Due 90 Days or More (Amounts In Thousands) December 31, 2018 Agricultural $ 1,026 $ — $ 135 $ 1,161 $ 91,512 $ 92,673 $ — Commercial and financial 988 459 225 1,672 227,829 229,501 — Real estate: Construction, 1 to 4 family residential — — 212 212 72,067 72,279 212 Construction, land development and commercial 233 202 — 435 113,372 113,807 — Mortgage, farmland 193 388 — 581 235,873 236,454 — Mortgage, 1 to 4 family first liens 3,972 833 3,234 8,039 904,020 912,059 158 Mortgage, 1 to 4 family junior liens 199 36 — 235 152,390 152,625 — Mortgage, multi-family — — — — 352,434 352,434 — Mortgage, commercial 733 344 — 1,077 382,237 383,314 — Loans to individuals 195 — 22 217 29,855 30,072 — Obligations of state and political subdivisions — — — — 52,725 52,725 — $ 7,539 $ 2,262 $ 3,828 $ 13,629 $ 2,614,314 $ 2,627,943 $ 370 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Accruing Loans Past Due 90 Days or More (Amounts In Thousands) December 31, 2017 Agricultural $ 324 $ — $ 269 $ 593 $ 87,987 $ 88,580 $ — Commercial and financial 447 20 93 560 218,072 218,632 — Real estate: Construction, 1 to 4 family residential — — — — 69,738 69,738 — Construction, land development and commercial 246 — — 246 109,349 109,595 — Mortgage, farmland 269 — — 269 215,017 215,286 — Mortgage, 1 to 4 family first liens 5,143 1,750 2,939 9,832 821,759 831,591 971 Mortgage, 1 to 4 family junior liens 579 116 — 695 143,505 144,200 — Mortgage, multi-family — — — — 336,810 336,810 — Mortgage, commercial 307 178 16 501 360,695 361,196 — Loans to individuals 206 55 6 267 26,150 26,417 — Obligations of state and political subdivisions — — — — 57,626 57,626 — $ 7,521 $ 2,119 $ 3,323 $ 12,963 $ 2,446,708 $ 2,459,671 $ 971
Schedule of impaired loan information	Certain impaired loan information by loan type at December 31, 2018 and 2017 was as follows: December 31, 2018 December 31, 2017 Nonaccrual loans (1) Accruing loans past due 90 days or more TDR loans Nonaccrual loans (1) Accruing loans past due 90 days or more TDR loans (Amounts In Thousands) (Amounts In Thousands) Agricultural $ 1,338 $ — $ 120 $ 1,651 $ — $ 2,309 Commercial and financial 1,476 — 2,686 825 — 1,943 Real estate: Construction, 1 to 4 family residential — 212 — — — — Construction, land development and commercial — — 328 — — 339 Mortgage, farmland 1,062 — 3,301 1,391 — 1,451 Mortgage, 1 to 4 family first liens 5,799 158 1,143 4,407 971 1,357 Mortgage, 1 to 4 family junior liens — — 24 7 — 25 Mortgage, multi-family 145 — — 218 — — Mortgage, commercial 1,009 — 937 597 — 1,046 Loans to individuals — — — — — — $ 10,829 $ 370 $ 8,539 $ 9,096 $ 971 $ 8,470 (1) There were $4.84 million and $3.62 million of TDR loans included within nonaccrual loans as of December 31, 2018 and 2017 , respectively.
Schedule of information for TDR loans	Below is a summary of information for TDR loans as of December 31, 2018 and 2017 : December 31, 2018 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 5 $ 1,316 $ 91 Commercial and financial 13 3,867 75 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 2 328 — Mortgage, farmland 8 4,291 — Mortgage, 1 to 4 family first liens 16 1,710 — Mortgage, 1 to 4 family junior liens 1 24 — Mortgage, multi-family — — — Mortgage, commercial 9 1,839 — Loans to individuals — — — 54 $ 13,375 $ 166 December 31, 2017 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 9 $ 3,628 $ 321 Commercial and financial 14 2,575 169 Real estate: Construction, 1 to 4 family residential — — 16 Construction, land development and commercial 2 339 — Mortgage, farmland 7 2,761 — Mortgage, 1 to 4 family first liens 13 1,442 — Mortgage, 1 to 4 family junior liens 1 25 24 Mortgage, multi-family — — — Mortgage, commercial 8 1,324 — Loans to individuals — — — 54 $ 12,094 $ 530 A summary of TDR loans that were modified during the year ended December 31, 2018 and 2017 was as follows: December 31, 2018 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 1 $ 163 $ 163 Commercial and financial 6 2,294 2,294 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 1 218 218 Mortgage, farmland 2 4,944 4,944 Mortgage, 1 to 4 family first liens 6 627 627 Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family — — — Mortgage, commercial 2 852 852 Loans to individuals — — — 18 $ 9,098 $ 9,098 December 31, 2017 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 6 $ 10,890 $ 10,890 Commercial and financial 5 2,051 2,051 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 1 231 231 Mortgage, farmland 2 598 598 Mortgage, 1 to 4 family first liens 2 311 311 Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family 1 249 249 Mortgage, commercial — — — Loans to individuals — — — 17 $ 14,330 $ 14,330
Schedule of impaired loans	Information regarding impaired loans as of and for the year ended December 31, 2018 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2018 With no related allowance recorded: Agricultural $ 1,395 $ 1,663 $ — $ 1,071 $ 23 Commercial and financial 1,650 2,503 — 1,977 58 Real estate: Construction, 1 to 4 family residential 111 148 — 113 — Construction, land development and commercial 328 344 — 333 18 Mortgage, farmland 3,612 4,071 — 3,068 89 Mortgage, 1 to 4 family first liens 6,089 7,819 — 6,435 36 Mortgage, 1 to 4 family junior liens — 254 — — — Mortgage, multi-family 145 213 — 153 — Mortgage, commercial 1,871 2,486 — 1,940 42 Loans to individuals — 14 — — — $ 15,201 $ 19,515 $ — $ 15,090 $ 266 With an allowance recorded: Agricultural $ 1,065 $ 1,229 $ 479 $ 980 $ 7 Commercial and financial 2,512 2,512 1,189 2,793 107 Real estate: Construction, 1 to 4 family residential 698 698 4 622 28 Construction, land development and commercial — — — — — Mortgage, farmland — — — — — Mortgage, 1 to 4 family first liens 899 974 70 888 25 Mortgage, 1 to 4 family junior liens 24 24 2 25 1 Mortgage, multi-family 7,447 7,447 305 7,543 346 Mortgage, commercial 75 75 1 77 4 Loans to individuals 64 64 64 77 9 $ 12,784 $ 13,023 $ 2,114 $ 13,005 $ 527 Total: Agricultural $ 2,460 $ 2,892 $ 479 $ 2,051 $ 30 Commercial and financial 4,162 5,015 1,189 4,770 165 Real estate: Construction, 1 to 4 family residential 809 846 4 735 28 Construction, land development and commercial 328 344 — 333 18 Mortgage, farmland 3,612 4,071 — 3,068 89 Mortgage, 1 to 4 family first liens 6,988 8,793 70 7,323 61 Mortgage, 1 to 4 family junior liens 24 278 2 25 1 Mortgage, multi-family 7,592 7,660 305 7,696 346 Mortgage, commercial 1,946 2,561 1 2,017 46 Loans to individuals 64 78 64 77 9 $ 27,985 $ 32,538 $ 2,114 $ 28,095 $ 793 Information regarding impaired loans as of and for the year ended December 31, 2017 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2017 With no related allowance recorded: Agricultural $ 1,822 $ 2,193 $ — $ 2,044 $ 19 Commercial and financial 1,725 2,487 — 2,080 51 Real estate: Construction, 1 to 4 family residential 114 150 — 116 5 Construction, land development and commercial 338 371 — 344 14 Mortgage, farmland 2,523 2,902 — 2,476 56 Mortgage, 1 to 4 family first liens 6,045 7,507 — 6,286 80 Mortgage, 1 to 4 family junior liens 7 482 — 23 — Mortgage, multi-family 218 355 — 231 — Mortgage, commercial 1,564 2,274 — 1,706 45 Loans to individuals — 14 — — — $ 14,356 $ 18,735 $ — $ 15,306 $ 270 With an allowance recorded: Agricultural $ 3,094 $ 3,149 $ 133 $ 3,526 $ 160 Commercial and financial 1,043 1,043 1,018 1,249 60 Real estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial 505 505 39 321 14 Mortgage, farmland 5,439 5,439 238 5,596 242 Mortgage, 1 to 4 family first liens 577 593 63 585 20 Mortgage, 1 to 4 family junior liens 25 25 3 26 1 Mortgage, multi-family 6,179 6,179 480 6,247 281 Mortgage, commercial 79 79 2 81 4 Loans to individuals 190 190 190 179 20 $ 17,131 $ 17,202 $ 2,166 $ 17,810 $ 802 Total: Agricultural $ 4,916 $ 5,342 $ 133 $ 5,570 $ 179 Commercial and financial 2,768 3,530 1,018 3,329 111 Real estate: Construction, 1 to 4 family residential 114 150 — 116 5 Construction, land development and commercial 843 876 39 665 28 Mortgage, farmland 7,962 8,341 238 8,072 298 Mortgage, 1 to 4 family first liens 6,622 8,100 63 6,871 100 Mortgage, 1 to 4 family junior liens 32 507 3 49 1 Mortgage, multi-family 6,397 6,534 480 6,478 281 Mortgage, commercial 1,643 2,353 2 1,787 49 Loans to individuals 190 204 190 179 20 $ 31,487 $ 35,937 $ 2,166 $ 33,116 $ 1,072 Information regarding impaired loans as of and for the year ended December 31, 2016 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2016 With no related allowance recorded: Agricultural $ 800 $ 971 $ — $ 923 $ — Commercial and financial 1,540 2,175 — 1,662 18 Real estate: Construction, 1 to 4 family residential 117 151 — 131 6 Construction, land development and commercial 204 290 — 207 5 Mortgage, farmland 2,594 2,887 — 2,767 67 Mortgage, 1 to 4 family first liens 5,011 6,137 — 5,265 53 Mortgage, 1 to 4 family junior liens 153 646 — 186 — Mortgage, multi-family 243 362 — 288 — Mortgage, commercial 1,901 2,727 — 1,996 46 Loans to individuals — 19 — — — $ 12,563 $ 16,365 $ — $ 13,425 $ 195 With an allowance recorded: Agricultural $ 10,920 $ 10,978 $ 856 $ 11,258 $ 464 Commercial and financial 937 955 718 777 27 Real estate: Construction, 1 to 4 family residential 815 815 105 537 27 Construction, land development and commercial — — — — — Mortgage, farmland 5,434 5,434 390 5,591 240 Mortgage, 1 to 4 family first liens 1,266 1,374 79 1,226 43 Mortgage, 1 to 4 family junior liens 612 667 11 637 27 Mortgage, multi-family — — — — — Mortgage, commercial 967 1,004 34 986 36 Loans to individuals 150 150 150 151 16 $ 21,101 $ 21,377 $ 2,343 $ 21,163 $ 880 Total: Agricultural $ 11,720 $ 11,949 $ 856 $ 12,181 $ 464 Commercial and financial 2,477 3,130 718 2,439 45 Real estate: Construction, 1 to 4 family residential 932 966 105 668 33 Construction, land development and commercial 204 290 — 207 5 Mortgage, farmland 8,028 8,321 390 8,358 307 Mortgage, 1 to 4 family first liens 6,277 7,511 79 6,491 96 Mortgage, 1 to 4 family junior liens 765 1,313 11 823 27 Mortgage, multi-family 243 362 — 288 — Mortgage, commercial 2,868 3,731 34 2,982 82 Loans to individuals 150 169 150 151 16 $ 33,664 $ 37,742 $ 2,343 $ 34,588 $ 1,075

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Major classes of property and equipment and the total accumulated depreciation	The major classes of property and equipment and the total accumulated depreciation are as follows: December 31, 2018 2017 (Amounts In Thousands) Land $ 10,899 $ 10,880 Buildings and improvements 36,815 36,686 Furniture and equipment 36,090 34,067 83,804 81,633 Less accumulated depreciation 46,753 43,776 Net $ 37,051 $ 37,857

Interest-Bearing Deposits (Tabl

Interest-Bearing Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Interest-bearing Deposit Liabilities [Abstract]
Deposits	A summary of these deposits is as follows: December 31, 2018 2017 (Amounts In Thousands) NOW and other demand $ 542,388 $ 520,647 Savings 925,214 907,121 Time, $100,000 and over 350,725 315,558 Other time 230,645 181,422 $ 2,048,972 $ 1,924,748
Time Deposits	Time deposits have a maturity as follows: December 31, 2018 2017 (Amounts In Thousands) Due in one year or less $ 229,091 $ 167,471 Due after one year through two years 223,254 90,741 Due after two years through three years 44,610 194,530 Due after three years through four years 35,002 40,140 Due over four years 49,413 4,098 $ 581,370 $ 496,980

Federal Home Loan Bank Borrow_2

Federal Home Loan Bank Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
Federal Home Loan Banks [Abstract]
Schedule of federal home loan bank borrowings	As of December 31, 2018 and 2017 , the borrowings were as follows: 2018 2017 (Effective interest rates as of December 31, 2018) (Amounts In Thousands) Due 2018, 3.65% — 20,000 Due 2019, 1.67% — 15,000 Due 2020, 3.05% 25,000 25,000 Due 2021, 2.06% to 2.27% — 30,000 Due 2022, 2.44% — 15,000 Due 2023, 3.77% 25,000 25,000 Due 2024, 2.38% 15,000 15,000 Due 2025, 2.54% to 3.07% 90,000 90,000 Due 2026, 2.52% to 2.86% 30,000 30,000 Due 2027, 2.76% to 2.95% 30,000 30,000 $ 215,000 $ 295,000

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2018
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of accumulated other comprehensive income (AOCI)	The components of accumulated other comprehensive income (AOCI), included in stockholders’ equity, are as follows: December 31, 2018 2017 (amounts in thousands) Net unrealized loss on available-for-sale securities $ (2,734 ) $ (1,141 ) Net unrealized loss on derivatives used for cash flow hedges (1,596 ) (2,819 ) Tax effect 1,080 1,514 Net-of-tax amount $ (3,250 ) $ (2,446 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Schedule of Employee Stock Ownership Plan (ESOP)	As of December 31, 2018 and 2017 , the shares held by the ESOP, fair value and maximum cash obligation were as follows: 2018 2017 Shares held by the ESOP 801,147 802,003 Fair value per share $ 61.00 $ 54.00 Maximum cash obligation $ 48,870,000 $ 43,308,000
Schedule of stock options activity	A summary of the stock options is as follows: Number of Shares Weighted- Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (In Thousands) Balance, December 31, 2015 19,380 $ 29.92 4.03 $ 580 Granted — Exercised — Balance, December 31, 2016 19,380 $ 29.92 3.03 580 Granted — Exercised (9,160 ) Balance, December 31, 2017 10,220 $ 33.44 4.45 342 Granted — Exercised (1,200 ) Balance, December 31, 2018 9,020 $ 33.30 3.41 $ 250
Schedule of pertinent information related to the options outstanding	Other pertinent information related to the options outstanding at December 31, 2018 is as follows: Exercise Price Number Outstanding Remaining Contractual Life Number Exercisable 33.00 7,220 40 months 7,220 34.50 1,800 46 months 1,800 9,020 9,020
Schedule of Restricted Stock Activity	A summary of the restricted stock option activity for the year ended December 31, 2018 is as follows: Number of Shares Weighted Average Grant Date Fair Value Balance, December 31, 2017 59,728 Granted 24,899 $58.90 Forfeited 3,296 $46.19 Balance, December 31, 2018 38,125

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Components of income tax	Income taxes for the years ended December 31, 2018 , 2017 and 2016 are summarized as follows: 2018 2017 2016 (Amounts In Thousands) Current: Federal $ 7,783 $ 13,770 $ 11,650 State 3,093 2,529 2,320 Deferred: Federal (1,560 ) 3,426 435 State (411 ) (188 ) (11 ) $ 8,905 $ 19,537 $ 14,394
Schedule of deferred tax assets and liabilities	Deferred tax assets and liabilities at December 31, 2018 and 2017 were as follows: December 31, 2018 2017 (Amounts In Thousands) Deferred income tax assets: Allowance for loan losses $ 9,434 $ 7,335 Deferred compensation 2,211 2,202 Unrealized losses on interest rate swaps 398 703 Accrued expenses 668 688 State net operating loss 795 836 Unrealized losses on investment securities 682 285 Gross deferred tax assets $ 14,188 $ 12,049 Valuation allowance (795 ) (836 ) Deferred tax asset, net of valuation allowance $ 13,393 $ 11,213 Deferred income tax liabilities: Property and equipment 1,728 1,652 Goodwill 407 407 Other 389 348 Gross deferred tax liabilities $ 2,524 $ 2,407 Net deferred tax assets $ 10,869 $ 8,806
Summary of change in deferred income tax	The net change in the deferred income taxes for the years ended December 31, 2018 , 2017 and 2016 is reflected in the consolidated financial statements as follows: Year Ended December 31, 2018 2017 2016 (Amounts In Thousands) Consolidated statements of income $ 1,971 $ (3,238 ) $ (424 ) Consolidated statements of stockholders' equity 92 (567 ) 1,340 $ 2,063 $ (3,805 ) $ 916
Schedule of effective income tax rate reconciliation	Income tax expense for the years ended December 31, 2018 , 2017 and 2016 are less than the amounts computed by applying the maximum effective federal income tax rate to the income before income taxes because of the following items: 2018 2017 2016 Amount % Of Pretax Income Amount % Of Pretax Income Amount % Of Pretax Income (Amounts In Thousands) Expected tax expense $ 9,591 21.0 % $ 16,659 35.0 % $ 16,082 35.0 % Tax-exempt interest (1,122 ) (2.5 ) (1,771 ) (3.7 ) (1,715 ) (3.7 ) Interest expense limitation 87 0.2 103 0.2 96 0.2 State income taxes, net of federal income tax benefit 2,119 4.6 1,522 3.2 1,501 3.2 Income tax credits (1,292 ) (2.8 ) (1,426 ) (3.0 ) (1,426 ) (3.1 ) Deferred tax asset revaluation — — 4,710 9.9 — — Other (478 ) (1.0 ) (260 ) (0.6 ) (144 ) (0.3 ) $ 8,905 19.5 % $ 19,537 41.0 % $ 14,394 31.3 %

Regulatory Capital Requiremen_2

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions (Tables)	12 Months Ended
	Dec. 31, 2018
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions [Abstract]
Schedule of minimum regulatory requirements	The actual amounts and capital ratios as of December 31, 2018 and 2017 , with the minimum regulatory requirements for the Company and Bank are presented below (amounts in thousands): Actual For Capital Adequacy Purposes To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount Ratio Ratio Ratio As of December 31, 2018: Company: Total risk-based capital $ 414,772 17.18 % 8.00 % 10.00 % Tier 1 risk-based capital 384,502 15.93 6.00 8.00 Tier 1 common equity 384,502 15.93 4.50 6.50 Leverage ratio 384,502 12.68 4.00 5.00 Bank: Total risk-based capital 416,198 17.25 8.00 10.00 Tier 1 risk-based capital 385,943 16.00 6.00 8.00 Tier 1 common equity 385,943 16.00 4.50 6.50 Leverage ratio 385,943 12.73 4.00 5.00 Actual For Capital Adequacy Purposes To Be Well-Capitalized Under Prompt Corrective Action Provisions Amount Ratio Ratio Ratio As of December 31, 2017: Company: Total risk-based capital $ 383,766 16.66 % 8.00 % 10.00 % Tier 1 risk-based capital 354,970 15.41 6.00 8.00 Tier 1 common equity 354,970 15.41 4.50 6.50 Leverage ratio 354,970 12.34 4.00 5.00 Bank: Total risk-based capital 384,181 16.69 8.00 10.00 Tier 1 risk-based capital 355,402 15.44 6.00 8.00 Tier 1 common equity 355,402 15.44 4.50 6.50 Leverage ratio 355,402 12.36 4.00 5.00

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	The following is an analysis of the changes in the loans to related parties during the years ended December 31, 2018 and 2017 : Year Ended December 31, 2018 2017 (Amounts In Thousands) Balance, beginning $ 42,496 $ 30,532 Net increase (decrease) due to change in related parties 188 (59 ) Advances 28,194 28,305 Collections (19,662 ) (16,282 ) Balance, ending $ 51,216 $ 42,496

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Carrying value and estimated fair values of entity's financial instruments	The carrying value and estimated fair values of the Company’s financial instruments as of December 31, 2018 are as follows: December 31, 2018 Carrying Amount Estimated Fair Value Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) (Amounts In Thousands) Financial instrument assets: Cash and cash equivalents $ 43,305 $ 43,305 $ 43,305 $ — $ — Investment securities 331,098 331,098 83,155 247,943 — Loans held for sale 1,984 1,984 — 1,984 — Loans Agricultural 89,884 93,736 — — 93,736 Commercial and financial 223,675 227,774 — — 227,774 Real estate: Construction, 1 to 4 family residential 70,982 72,419 — — 72,419 Construction, land development and commercial 111,812 112,960 — — 112,960 Mortgage, farmland 232,482 235,771 — — 235,771 Mortgage, 1 to 4 family first liens 902,261 882,908 — — 882,908 Mortgage, 1 to 4 family junior liens 150,859 148,128 — — 148,128 Mortgage, multi-family 348,351 342,099 — — 342,099 Mortgage, commercial 379,232 376,257 — — 376,257 Loans to individuals 29,349 29,962 — — 29,962 Obligations of state and political subdivisions 52,198 51,945 — — 51,945 Accrued interest receivable 11,784 11,784 — 11,784 — Total financial instrument assets $ 2,979,256 $ 2,962,130 $ 126,460 $ 261,711 $ 2,573,959 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 372,152 $ 372,152 $ — $ 372,152 $ — Interest-bearing deposits 2,048,972 2,059,336 — 2,059,336 — Federal Home Loan Bank borrowings 215,000 207,948 — 207,948 — Interest rate swaps 1,596 1,596 — 1,596 — Accrued interest payable 1,812 1,812 — 1,812 — Total financial instrument liabilities $ 2,639,532 $ 2,642,844 $ — $ 2,642,844 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 375,940 $ — $ — $ — $ — Letters of credit 9,033 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 384,973 $ — $ — $ — $ — (1) Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”). (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. The carrying value and estimated fair values of the Company’s financial instruments as of December 31, 2017 are as follows: December 31, 2017 Carrying Amount Estimated Fair Value Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) (Amounts In Thousands) Financial instrument assets: Cash and cash equivalents $ 154,353 $ 154,353 $ 154,353 $ — $ — Investment securities 300,160 300,160 54,318 245,842 — Loans held for sale 5,162 5,162 — 5,162 — Loans Agricultural 86,286 86,229 — — 86,229 Commercial and financial 213,795 212,244 — — 212,244 Real estate: Construction, 1 to 4 family residential 68,545 69,036 — — 69,036 Construction, land development and commercial 107,799 108,651 — — 108,651 Mortgage, farmland 211,617 211,947 — — 211,947 Mortgage, 1 to 4 family first liens 824,222 818,083 — — 818,083 Mortgage, 1 to 4 family junior liens 142,901 142,180 — — 142,180 Mortgage, multi-family 334,019 329,344 — — 329,344 Mortgage, commercial 358,287 353,796 — — 353,796 Loans to individuals 25,635 25,610 — — 25,610 Obligations of state and political subdivisions 57,165 55,066 — — 55,066 Accrued interest receivable 10,772 10,772 — 10,772 — Total financial instrument assets $ 2,900,718 $ 2,882,633 $ 208,671 $ 261,776 $ 2,412,186 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 363,817 $ 363,817 $ — $ 363,817 $ — Interest-bearing deposits 1,924,748 1,934,442 — 1,934,442 — Federal Home Loan Bank Borrowings 295,000 284,442 — 284,442 — Interest rate swaps 2,819 2,819 — 2,819 — Accrued interest payable 1,290 1,290 — 1,290 — Total financial instrument liabilities $ 2,587,674 $ 2,586,810 $ — $ 2,586,810 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 380,877 $ — $ — $ — $ — Letters of credit 9,113 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 389,990 $ — $ — $ — $ — (1) Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”). (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market
Schedule of assets and liabilities measured at fair value on a recurring basis	The table below represents the balances of assets and liabilities measured at fair value on a recurring basis: December 31, 2018 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Securities available for sale (Amounts in Thousands) U.S. Treasury $ 83,155 $ — $ — $ 83,155 State and political subdivisions — 200,900 — 200,900 Other securities (FHLB, FHLMC and FNMA) — 34,871 — 34,871 Derivative Financial Instruments Interest rate swaps — (1,596 ) — (1,596 ) Total $ 83,155 $ 234,175 $ — $ 317,330 December 31, 2017 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Securities available for sale (Amounts in Thousands) U.S. Treasury $ 54,318 $ — $ — $ 54,318 State and political subdivisions — 186,878 — 186,878 Other securities (FHLB, FHLMC and FNMA) — 43,959 — 43,959 Derivative Financial Instruments Interest rate swaps — (2,819 ) — (2,819 ) Total $ 54,318 $ 228,018 $ — $ 282,336 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
Schedule of assets measured at fair value on a nonrecurring basis	For assets measured at fair value on a nonrecurring basis that were still held on the balance sheet at December 31, 2018 and 2017 , the following tables provide the level of valuation assumptions used to determine the adjustment and the carrying value of the related individual assets at year end. December 31, 2018 Year Ended December 31, 2018 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 1,160 $ 1,160 $ 63 Commercial and financial — — 2,882 2,882 122 Real Estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — 703 703 — Mortgage, farmland — — 3,848 3,848 — Mortgage, 1 to 4 family first liens — — 6,729 6,729 520 Mortgage, 1 to 4 family junior liens — — 22 22 60 Mortgage, multi-family — — 7,286 7,286 — Mortgage, commercial — — 1,458 1,458 349 Loans to individuals — — — — — Foreclosed assets (5) — — — — — Total $ — $ — $ 24,088 $ 24,088 $ 1,114 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. (4) Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero. (5) Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets. December 31, 2017 Year Ended December 31, 2017 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 4,704 $ 4,704 $ 127 Commercial and financial — — 1,555 1,555 159 Real Estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — 729 729 — Mortgage, farmland — — 7,190 7,190 — Mortgage, 1 to 4 family first liens — — 5,548 5,548 404 Mortgage, 1 to 4 family junior liens — — 25 25 88 Mortgage, multi-family — — 6,397 6,397 — Mortgage, commercial — — 1,063 1,063 111 Loans to individuals — — — — 20 Foreclosed assets (5) — — — — — Total $ — $ — $ 27,211 $ 27,211 $ 909 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. (4) Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero. (5) Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.

Parent Company Only Financial_2

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
CONDENSED BALANCE SHEETS	ASSETS 2018 2017 Cash and cash equivalents at subsidiary bank $ 3,742 $ 4,015 Investment in subsidiary bank 385,193 355,456 Other assets 1,231 1,393 Total assets $ 390,166 $ 360,864 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities $ 6,414 $ 5,840 Redeemable common stock held by ESOP 48,870 43,308 Stockholders' equity: Capital stock 52,122 48,930 Retained earnings 371,848 341,558 Accumulated other comprehensive loss (3,250 ) (2,446 ) Treasury stock at cost (36,968 ) (33,018 ) 383,752 355,024 Less maximum cash obligation related to ESOP shares 48,870 43,308 Total stockholders' equity 334,882 311,716 Total liabilities and stockholders' equity $ 390,166 $ 360,864
CONDENSED STATEMENTS OF INCOME	2018 2017 2016 Dividends received from subsidiary $ 11,502 $ 7,485 $ 8,560 Other expenses (786 ) (741 ) (570 ) Income before income tax benefit and equity in undistributed income of subsidiary 10,716 6,744 7,990 Income tax benefit 273 73 292 10,989 6,817 8,282 Equity in undistributed income of subsidiary 25,778 21,244 23,273 Net income $ 36,767 $ 28,061 $ 31,555
CONDENSED STATEMENTS OF CASH FLOWS	2018 2017 2016 Cash flows from operating activities: Net income $ 36,767 $ 28,061 $ 31,555 Adjustments to reconcile net income to cash and cash equivalents provided by operating activities: Equity in undistributed income of subsidiary (25,778 ) (21,244 ) (23,273 ) Share-based compensation — 11 29 Compensation expensed through issuance of common stock 1,466 1,446 1,078 Excess tax benefits related to share-based compensation — — (70 ) Forfeiture of common stock (152 ) (156 ) (52 ) Decrease (increase) in other assets 162 237 (8 ) Increase in other liabilities 574 3,212 103 Net cash and cash equivalents provided by operating activities 13,039 11,567 9,362 Cash flows from financing activities: Issuance of common stock, net of costs 4,713 3,762 — Stock options exercised 41 238 — Excess tax benefits related to share-based compensation — — 70 Purchase of treasury stock (6,784 ) (2,435 ) (3,926 ) Proceeds from the issuance of common stock through the employee stock purchase plan 421 325 254 Capital contribution to subsidiary (4,700 ) (3,500 ) — Dividends paid (7,003 ) (6,485 ) (6,060 ) Net cash and cash equivalents used by financing activities (13,312 ) (8,095 ) (9,662 ) (Decrease) increase in cash and cash equivalents (273 ) 3,472 (300 ) Cash and cash equivalents: Beginning of year 4,015 543 843 Ending of year $ 3,742 $ 4,015 $ 543

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of banks commitments	A summary of the Bank’s commitments at December 31, 2018 and 2017 is as follows: 2018 2017 (Amounts In Thousands) Firm loan commitments and unused portion of lines of credit: Home equity loans $ 59,330 $ 55,171 Credit cards 52,802 49,235 Commercial, real estate and home construction 89,171 117,021 Commercial lines and real estate purchase loans 174,637 159,450 Outstanding letters of credit 9,033 9,113
Non-cancelable leases relating to Bank premises	The minimum future rental commitments as of December 31, 2018 for all non-cancelable leases relating to Bank premises were as follows: Year ending December 31: (Amounts In Thousands) 2019 $ 464 2020 467 2021 371 2022 315 2023 308 Thereafter 80 $ 2,005

Quarterly Results of Operatio_2

Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations	Quarter Ended March June September December Year 2018 Interest income $ 28,031 $ 29,064 $ 30,411 $ 31,291 $ 118,797 Interest expense 5,738 6,241 6,891 7,453 26,323 Net interest income $ 22,293 $ 22,823 $ 23,520 $ 23,838 $ 92,474 Provision for loan losses (765 ) 711 1,593 6,958 8,497 Other income 5,628 6,234 6,668 5,288 23,818 Other expense 15,256 15,680 15,955 15,232 62,123 Income before income taxes $ 13,430 $ 12,666 $ 12,640 $ 6,936 $ 45,672 Income taxes 2,572 2,603 2,590 1,140 8,905 Net income $ 10,858 $ 10,063 $ 10,050 $ 5,796 $ 36,767 Basic earnings per share $ 1.16 $ 1.07 $ 1.07 $ 0.63 $ 3.93 Diluted earnings per share 1.16 1.07 1.07 0.62 3.92 2017 Interest income $ 25,180 $ 26,133 $ 26,872 $ 27,767 $ 105,952 Interest expense 3,983 4,182 4,652 5,155 17,972 Net interest income $ 21,197 $ 21,951 $ 22,220 $ 22,612 $ 87,980 Provision for loan losses (814 ) 2,511 130 (139 ) 1,688 Other income 5,241 5,001 5,005 5,571 20,818 Other expense 14,411 15,201 14,821 15,079 59,512 Income before income taxes $ 12,841 $ 9,240 $ 12,274 $ 13,243 47,598 Income taxes 3,967 2,783 3,722 9,065 19,537 Net income $ 8,874 $ 6,457 $ 8,552 $ 4,178 $ 28,061 Basic earnings per share $ 0.95 $ 0.69 $ 0.92 $ 0.45 $ 3.01 Diluted earnings per share 0.95 0.69 0.92 0.45 3.01

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Identification of the balance sheet category and fair values of the derivative instruments designated as cash flow hedges	The table below identifies the balance sheet category and fair values of the Bank’s derivative instruments designated as cash flow hedges as of December 31, 2018 and 2017 : Notional Amount Fair Value Balance Sheet Category Maturity (Amounts in Thousands) December 31, 2018 Interest rate swap $ 25,000 $ (120 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (1,476 ) Other Liabilities 11/7/2023 December 31, 2017 Interest rate swap $ 25,000 $ (582 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,237 ) Other Liabilities 11/7/2023
Identification of the gains and losses recognized on the derivative instruments designated as cash flow hedges	The table below identifies the gains and losses recognized on the Bank’s derivative instruments designated as cash flow hedges for the years ended December 31, 2018 and 2017 : Effective Portion Ineffective Portion Recognized in OCI Reclassified from AOCI into Income Recognized in Income on Derivatives Amount of Gain (Loss) Category Amount of Gain (Loss) Category Amount of Gain (Loss) (Amounts in Thousands) December 31, 2018 Interest rate swap $ 347 Interest Expense $ — Other Income $ — Interest rate swap 571 Interest Expense — Other Income — December 31, 2017 Interest rate swap $ 318 Interest Expense $ — Other Income $ — Interest rate swap 373 Interest Expense — Other Income —

Nature of Activities and Sign_4

Nature of Activities and Significant Accounting Policies (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)propertysegment	Dec. 31, 2017USD ($)
Nature of activities
Number of Reportable Segments | segment		1
Loans
Period of past due loans considered as impaired		90 days
Tax credit real estate
Number of multi family rental properties		2
Number of assisted living rental properties		3
Number of multi tenant rental properties for persons with disabilities		1
Number of multi family senior living rental properties		1
Ownership interest in each limited partnership (or greater)		99.00%
Duration of tax credit of each property		10 years
Deferred income taxes
Recognized income tax positions, maximum realized (in hundredths)		50.00%
Effect of New Financial Accounting Standards
Retained earnings, estimated reclassification | $		$ 371,848	$ 341,558
Building and Improvements [Member] | Minimum [Member]
Property and equipment
Estimated useful lives		7 years	7 years
Building and Improvements [Member] | Maximum [Member]
Property and equipment
Estimated useful lives		40 years	40 years
Furniture and Equipment [Member] | Minimum [Member]
Property and equipment
Estimated useful lives		3 years	3 years
Furniture and Equipment [Member] | Maximum [Member]
Property and equipment
Estimated useful lives		10 years	10 years
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2018-02 [Member]
Effect of New Financial Accounting Standards
Tax Cuts And Jobs Act Of 2017, Reclassification From AOCI To Retained Earnings, Tax Effect | $	$ 530

Nature of Activities and Sign_5

Nature of Activities and Significant Accounting Policies - Earning 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
Computation of weighted average number of basic and diluted shares:
Common shares outstanding at the beginning of the year									9,335,154	9,264,227	9,322,054
Weighted average number of net shares issued									31,160	65,776
Weighted average number of net shares redeemed											(34,965)
Weighted average shares outstanding (basic)									9,366,314	9,330,003	9,287,089
Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method									4,027	4,632	6,445
Weighted average number of shares (diluted)									9,370,341	9,334,635	9,293,534
Net income	$ 5,796	$ 10,050	$ 10,063	$ 10,858	$ 4,178	$ 8,552	$ 6,457	$ 8,874	$ 36,767	$ 28,061	$ 31,555
Earnings per share:
Basic (in dollars per share)	$ 0.63	$ 1.07	$ 1.07	$ 1.16	$ 0.45	$ 0.92	$ 0.69	$ 0.95	$ 3.93	$ 3.01	$ 3.40
Diluted (in dollars per share)	$ 0.62	$ 1.07	$ 1.07	$ 1.16	$ 0.45	$ 0.92	$ 0.69	$ 0.95	$ 3.92	$ 3.01	$ 3.40

Investment Securities - Carryin

Investment Securities - Carrying Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Abstract]
Investment in subsidiary bank	$ 318,926	$ 285,155
Securities available for sale, Percent	100.00%	100.00%
US Treasury [Member]
Debt Securities, Available-for-sale [Abstract]
Investment in subsidiary bank	$ 83,155	$ 54,318
Securities available for sale, Percent	26.07%	19.05%
Other securities (FHLB, FHLMC and FNMA) [Member]
Debt Securities, Available-for-sale [Abstract]
Investment in subsidiary bank	$ 34,871	$ 43,959
Securities available for sale, Percent	10.93%	15.42%
State and political subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Investment in subsidiary bank	$ 200,900	$ 186,878
Securities available for sale, Percent	63.00%	65.53%

Investment Securities - Carry_2

Investment Securities - Carrying Amount of Available-for-Sale Securities and Approximate Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 321,660	$ 286,296
Gross Unrealized Gains	402	723
Gross Unrealized (Losses)	(3,136)	(1,864)
Estimated Fair Value	318,926	285,155
US Treasury [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	83,839	54,696
Gross Unrealized Gains	124	0
Gross Unrealized (Losses)	(808)	(378)
Estimated Fair Value	83,155	54,318
Other securities (FHLB, FHLMC and FNMA) [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	35,371	44,470
Gross Unrealized Gains	0	1
Gross Unrealized (Losses)	(500)	(512)
Estimated Fair Value	34,871	43,959
State and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	202,450	187,130
Gross Unrealized Gains	278	722
Gross Unrealized (Losses)	(1,828)	(974)
Estimated Fair Value	$ 200,900	$ 186,878

Investment Securities - Availab

Investment Securities - Available-for-Sale Securities Classified as per Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized Cost
Due in one year or less	$ 59,118
Due after one year through five years	182,133
Due after five years through ten years	79,188
Due over ten years	1,221
Amortized Cost	321,660	$ 286,296
Fair Value
Due in one year or less	58,971
Due after one year through five years	180,663
Due after five years through ten years	78,064
Due over ten years	1,228
Total	$ 318,926	$ 285,155

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Investment in subsidiary bank	$ 318,926	$ 285,155
Collateralized Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment in subsidiary bank	$ 9,780

Investment Securities - Avail_2

Investment Securities - Available-for-Sale Securities, Continuous Unrealized Loss Position, Fair Value (Details)	Dec. 31, 2018USD ($)security	Dec. 31, 2017USD ($)security
Less than 12 months [Abstract]
Number of securities | security	119	272
Fair Value	$ 45,666,000	$ 134,532,000
Unrealized Loss	$ (211,000)	$ (1,034,000)
Percent of Unrealized Loss	0.46%	0.77%
12 months or more [Abstract]
Number of securities | security	358	74
Fair Value	$ 159,235,000	$ 37,491,000
Unrealized Loss	$ (2,925,000)	$ (830,000)
Percent of Unrealized Loss	1.84%	2.21%
Total [Abstract]
Number of securities | security	477	346
Fair Value	$ 204,901,000	$ 172,023,000
Unrealized Loss	$ (3,136,000)	$ (1,864,000)
Percent of Unrealized Loss	1.53%	1.08%
US Treasury Securities [Member]
Less than 12 months [Abstract]
Number of securities | security	6	22
Fair Value	$ 14,644,000	$ 54,318,000
Unrealized Loss	$ (49,000)	$ (378,000)
Percent of Unrealized Loss	0.33%	0.70%
12 months or more [Abstract]
Number of securities | security	19	0
Fair Value	$ 46,443,000	$ 0
Unrealized Loss	$ (759,000)	$ 0
Percent of Unrealized Loss	1.63%	0.00%
Total [Abstract]
Number of securities | security	25	22
Fair Value	$ 61,087,000	$ 54,318,000
Unrealized Loss	$ (808,000)	$ (378,000)
Percent of Unrealized Loss	1.32%	0.70%
Other securities (FHLB, FHLMC and FNMA) [Member]
Less than 12 months [Abstract]
Number of securities | security	0	9
Fair Value	$ 0	$ 21,411,000
Unrealized Loss	$ 0	$ (83,000)
Percent of Unrealized Loss	0.00%	0.39%
12 months or more [Abstract]
Number of securities | security	14	9
Fair Value	$ 34,871,000	$ 22,547,000
Unrealized Loss	$ (500,000)	$ (429,000)
Percent of Unrealized Loss	1.43%	1.90%
Total [Abstract]
Number of securities | security	14	18
Fair Value	$ 34,871,000	$ 43,958,000
Unrealized Loss	$ (500,000)	$ (512,000)
Percent of Unrealized Loss	1.43%	1.16%
State and political subdivisions [Member]
Less than 12 months [Abstract]
Number of securities | security	113	241
Fair Value	$ 31,022,000	$ 58,803,000
Unrealized Loss	$ (162,000)	$ (573,000)
Percent of Unrealized Loss	0.52%	0.97%
12 months or more [Abstract]
Number of securities | security	325	65
Fair Value	$ 77,921,000	$ 14,944,000
Unrealized Loss	$ (1,666,000)	$ (401,000)
Percent of Unrealized Loss	2.14%	2.68%
Total [Abstract]
Number of securities | security	438	306
Fair Value	$ 108,943,000	$ 73,747,000
Unrealized Loss	$ (1,828,000)	$ (974,000)
Percent of Unrealized Loss	1.68%	1.32%

Loans - Classes of Loans (Detai

Loans - Classes of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of classes of loans [Abstract]
Loans and receivable	$ 2,627,943	$ 2,459,671	$ 2,277,148
Net unamortized fees and costs	952	894
Loans and receivable, gross	2,628,895	2,460,565
Less allowance for loan losses	37,810	29,400
Loans and receivable, net	2,591,085	2,431,165
Agricultural [Member]
Summary of classes of loans [Abstract]
Loans and receivable	92,673	88,580	92,871
Commercial and financial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	229,501	218,632	192,995
Construction, 1 to 4 family residential [Member]
Summary of classes of loans [Abstract]
Loans and receivable	72,279	69,738
Construction, land development and commercial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	113,807	109,595
Mortgage, farmland [Member]
Summary of classes of loans [Abstract]
Loans and receivable	236,454	215,286	$ 202,340
Mortgage, 1 to 4 family first liens [Member]
Summary of classes of loans [Abstract]
Loans and receivable	912,059	831,591
Mortgage, 1 to 4 family junior liens [Member]
Summary of classes of loans [Abstract]
Loans and receivable	152,625	144,200
Mortgage, multi-family [Member]
Summary of classes of loans [Abstract]
Loans and receivable	352,434	336,810
Mortgage, commercial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	383,314	361,196
Loans to individuals [Member]
Summary of classes of loans [Abstract]
Loans and receivable	30,072	26,417
Obligations of state and political subdivisions [Member]
Summary of classes of loans [Abstract]
Loans and receivable	$ 52,725	$ 57,626

Loans - Allowance For Credit Lo

Loans - Allowance For Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan losses:
Beginning balance	$ 29,400	$ 26,530	$ 26,510
Charge-offs	(2,322)	(2,104)	(2,631)
Recoveries	2,235	3,286	3,814
Provision	8,497	1,688	(1,163)
Ending balance	37,810	29,400	26,530
Ending balance, individually evaluated for impairment	2,114	2,166	2,343
Ending balance, collectively evaluated for impairment	35,696	27,234	24,187
Loan balances:
Ending balance	2,627,943	2,459,671	2,277,148
Ending balance, individually evaluated for impairment	27,985	31,487	33,664
Ending balance, collectively evaluated for impairment	2,599,958	2,428,184	2,243,484
Agricultural [Member]
Allowance for loan losses:
Beginning balance	2,294	2,947	3,082
Charge-offs	(95)	(167)	(226)
Recoveries	119	146	181
Provision	471	(632)	(90)
Ending balance	2,789	2,294	2,947
Ending balance, individually evaluated for impairment	479	133	856
Ending balance, collectively evaluated for impairment	2,310	2,161	2,091
Loan balances:
Ending balance	92,673	88,580	92,871
Ending balance, individually evaluated for impairment	2,460	4,916	11,720
Ending balance, collectively evaluated for impairment	90,213	83,664	81,151
Commercial and Financial [Member]
Allowance for loan losses:
Beginning balance	4,837	4,531	4,517
Charge-offs	(585)	(583)	(315)
Recoveries	1,057	1,183	1,169
Provision	517	(294)	(840)
Ending balance	5,826	4,837	4,531
Ending balance, individually evaluated for impairment	1,189	1,018	718
Ending balance, collectively evaluated for impairment	4,637	3,819	3,813
Loan balances:
Ending balance	229,501	218,632	192,995
Ending balance, individually evaluated for impairment	4,162	2,768	2,477
Ending balance, collectively evaluated for impairment	225,339	215,864	190,518
Real Estate: Construction and land development [Member]
Allowance for loan losses:
Beginning balance	2,989	2,890	2,280
Charge-offs	0	(114)	(34)
Recoveries	148	662	849
Provision	155	(449)	(205)
Ending balance	3,292	2,989	2,890
Ending balance, individually evaluated for impairment	4	39	105
Ending balance, collectively evaluated for impairment	3,288	2,950	2,785
Loan balances:
Ending balance	186,086	179,333	179,425
Ending balance, individually evaluated for impairment	1,137	957	1,136
Ending balance, collectively evaluated for impairment	184,949	178,376	178,289
Real Estate: Mortgage, farmland [Member]
Allowance for loan losses:
Beginning balance	3,669	3,417	3,342
Charge-offs	0	(3)	(116)
Recoveries	30	0	0
Provision	273	255	191
Ending balance	3,972	3,669	3,417
Ending balance, individually evaluated for impairment	0	238	390
Ending balance, collectively evaluated for impairment	3,972	3,431	3,027
Loan balances:
Ending balance	236,454	215,286	202,340
Ending balance, individually evaluated for impairment	3,612	7,962	8,028
Ending balance, collectively evaluated for impairment	232,842	207,324	194,312
Real Estate: Mortgage, 1 to 4 family [Member]
Allowance for loan losses:
Beginning balance	8,668	7,677	8,172
Charge-offs	(830)	(553)	(1,181)
Recoveries	612	661	1,043
Provision	4,066	883	(357)
Ending balance	12,516	8,668	7,677
Ending balance, individually evaluated for impairment	72	66	90
Ending balance, collectively evaluated for impairment	12,444	8,602	7,587
Loan balances:
Ending balance	1,064,684	975,791	892,869
Ending balance, individually evaluated for impairment	7,012	6,654	7,042
Ending balance, collectively evaluated for impairment	1,057,672	969,137	885,827
Real Estate: Mortgage, multi-family and commercial [Member]
Allowance for loan losses:
Beginning balance	5,700	4,045	4,223
Charge-offs	(251)	(130)	(66)
Recoveries	107	376	385
Provision	2,609	1,409	(497)
Ending balance	8,165	5,700	4,045
Ending balance, individually evaluated for impairment	306	482	34
Ending balance, collectively evaluated for impairment	7,859	5,218	4,011
Loan balances:
Ending balance	735,748	698,006	637,029
Ending balance, individually evaluated for impairment	9,538	8,040	3,111
Ending balance, collectively evaluated for impairment	726,210	689,966	633,918
Others [Member]
Allowance for loan losses:
Beginning balance	1,243	1,023	894
Charge-offs	(561)	(554)	(693)
Recoveries	162	258	187
Provision	406	516	635
Ending balance	1,250	1,243	1,023
Ending balance, individually evaluated for impairment	64	190	150
Ending balance, collectively evaluated for impairment	1,186	1,053	873
Loan balances:
Ending balance	82,797	84,043	79,619
Ending balance, individually evaluated for impairment	64	190	150
Ending balance, collectively evaluated for impairment	$ 82,733	$ 83,853	$ 79,469

Loans - Credit Quality Indicato

Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	$ 2,627,943	$ 2,459,671	$ 2,277,148
Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	92,673	88,580	92,871
Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	229,501	218,632	192,995
Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	72,279	69,738
Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	113,807	109,595
Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	236,454	215,286	$ 202,340
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	912,059	831,591
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	152,625	144,200
Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	352,434	336,810
Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	383,314	361,196
Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	30,072	26,417
Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	52,725	57,626
Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	80,323	78,743
Excellent [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,667	2,585
Excellent [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,322	10,264
Excellent [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Excellent [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	209	2,548
Excellent [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	5,619	4,751
Excellent [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	2,715	2,392
Excellent [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	520	489
Excellent [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	22,058	16,564
Excellent [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	34,096	30,355
Excellent [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	1
Excellent [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	8,117	8,794
Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	349,134	393,338
Good [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	15,342	15,755
Good [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	51,562	51,620
Good [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	13,029	4,710
Good [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	16,667	27,296
Good [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	52,364	54,409
Good [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	33,134	30,094
Good [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,569	4,527
Good [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	60,047	75,768
Good [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	86,453	98,434
Good [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	315	118
Good [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	15,652	30,607
Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,703,928	1,586,032
Satisfactory [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	39,897	40,886
Satisfactory [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	121,759	116,375
Satisfactory [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	42,043	47,995
Satisfactory [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	68,123	35,749
Satisfactory [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	126,706	109,724
Satisfactory [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	752,473	689,645
Satisfactory [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	138,533	130,451
Satisfactory [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	187,641	195,652
Satisfactory [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	177,271	179,417
Satisfactory [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	28,797	25,445
Satisfactory [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	20,685	14,693
Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	386,561	305,842
Monitor [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	27,510	17,009
Monitor [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	35,897	29,392
Monitor [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	15,045	15,188
Monitor [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	19,888	39,760
Monitor [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	41,486	32,655
Monitor [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	96,187	76,766
Monitor [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	6,242	4,881
Monitor [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	60,398	42,373
Monitor [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	74,990	43,786
Monitor [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	647	500
Monitor [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	8,271	3,532
Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	53,601	43,374
Special Mention [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	647	6,898
Special Mention [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	11,418	5,576
Special Mention [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,767	1,845
Special Mention [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	7,635	3,358
Special Mention [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,055	5,306
Special Mention [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	10,439	12,072
Special Mention [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,130	1,834
Special Mention [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	16,065	0
Special Mention [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,228	6,303
Special Mention [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	217	182
Special Mention [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	54,396	52,342
Substandard [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	5,610	5,447
Substandard [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	5,543	5,405
Substandard [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	395	0
Substandard [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,285	884
Substandard [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	9,224	8,441
Substandard [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	17,111	20,622
Substandard [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,631	2,018
Substandard [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	6,225	6,453
Substandard [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	7,276	2,901
Substandard [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	96	171
Substandard [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	$ 0	$ 0

Loans - Past Due Receivables (D

Loans - Past Due Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of past due loans [Abstract]
Total Past Due	$ 13,629	$ 12,963
Current	2,614,314	2,446,708
Ending balance	2,627,943	2,459,671	$ 2,277,148
Accruing Loans Past Due 90 Days or More	370	971
Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,161	593
Current	91,512	87,987
Ending balance	92,673	88,580	92,871
Accruing Loans Past Due 90 Days or More	0	0
Commercial and financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,672	560
Current	227,829	218,072
Ending balance	229,501	218,632	192,995
Accruing Loans Past Due 90 Days or More	0	0
Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	212	0
Current	72,067	69,738
Ending balance	72,279	69,738
Accruing Loans Past Due 90 Days or More	212	0
Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	435	246
Current	113,372	109,349
Ending balance	113,807	109,595
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	581	269
Current	235,873	215,017
Ending balance	236,454	215,286	$ 202,340
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	8,039	9,832
Current	904,020	821,759
Ending balance	912,059	831,591
Accruing Loans Past Due 90 Days or More	158	971
Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	235	695
Current	152,390	143,505
Ending balance	152,625	144,200
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
Current	352,434	336,810
Ending balance	352,434	336,810
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,077	501
Current	382,237	360,695
Ending balance	383,314	361,196
Accruing Loans Past Due 90 Days or More	0	0
Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	217	267
Current	29,855	26,150
Ending balance	30,072	26,417
Accruing Loans Past Due 90 Days or More	0	0
Obligations of state and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
Current	52,725	57,626
Ending balance	52,725	57,626
Accruing Loans Past Due 90 Days or More	0	0
30 - 59 Days Past Due
Schedule of past due loans [Abstract]
Total Past Due	7,539	7,521
30 - 59 Days Past Due | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,026	324
30 - 59 Days Past Due | Commercial and financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	988	447
30 - 59 Days Past Due | Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
30 - 59 Days Past Due | Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	233	246
30 - 59 Days Past Due | Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	193	269
30 - 59 Days Past Due | Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	3,972	5,143
30 - 59 Days Past Due | Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	199	579
30 - 59 Days Past Due | Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
30 - 59 Days Past Due | Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	733	307
30 - 59 Days Past Due | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	195	206
30 - 59 Days Past Due | Obligations of state and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due
Schedule of past due loans [Abstract]
Total Past Due	2,262	2,119
60 - 89 Days Past Due | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due | Commercial and financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	459	20
60 - 89 Days Past Due | Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due | Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	202	0
60 - 89 Days Past Due | Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	388	0
60 - 89 Days Past Due | Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	833	1,750
60 - 89 Days Past Due | Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	36	116
60 - 89 Days Past Due | Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due | Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	344	178
60 - 89 Days Past Due | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	55
60 - 89 Days Past Due | Obligations of state and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due
Schedule of past due loans [Abstract]
Total Past Due	3,828	3,323
90 Days or More Past Due | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	135	269
90 Days or More Past Due | Commercial and financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	225	93
90 Days or More Past Due | Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	212	0
90 Days or More Past Due | Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due | Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due | Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	3,234	2,939
90 Days or More Past Due | Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due | Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due | Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	16
90 Days or More Past Due | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	22	6
90 Days or More Past Due | Obligations of state and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	$ 0	$ 0

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Accruing loans past due 90 days or more increased	$ 600,000
Accruing loans past due 90 days or more percentage of total loans (in hundredths)	0.01%	0.04%
Average 90 days or more past due loan balance	$ 190,000	$ 120,000
TDR loans default payment	0	$ 0
Impaired loans increase	3,500,000
Increase in nonaccrual loans	(1,730,000)
Decrease Specific Reserve Loans Financing Receivable Unpaid Principal Balance	4,700,000
Decrease in TDR loans	690,000
Increase (Decrease) Accruing Loans Past days or More Financing Receivable Unpaid Principal Balance	$ 600,000
Prior period within which impairment is being measured	1 year
Number of period within which average appraisals obtained	1 month

Loans - Impaired Financing Rece

Loans - Impaired Financing Receivable Loan Type (Details) - USD ($) $ in Thousands	Dec. 31, 2018		Dec. 31, 2017
Summary of certain impaired loan information [Abstract]
Non-accrual loans	$ 10,829	[1]	$ 9,096
Accruing loans past due 90 days or more	370		971
TDR loans	8,539		8,470
Agricultural [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,338	[1]	1,651
Accruing loans past due 90 days or more	0		0
TDR loans	120		2,309
Commercial and financial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,476	[1]	825
Accruing loans past due 90 days or more	0		0
TDR loans	2,686		1,943
Construction, 1 to 4 family residential [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	[1]	0
Accruing loans past due 90 days or more	212		0
TDR loans	0		0
Construction, land development and commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	[1]	0
Accruing loans past due 90 days or more	0		0
TDR loans	328		339
Mortgage, farmland [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,062	[1]	1,391
Accruing loans past due 90 days or more	0		0
TDR loans	3,301		1,451
Mortgage, 1 to 4 family first liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	5,799	[1]	4,407
Accruing loans past due 90 days or more	158		971
TDR loans	1,143		1,357
Mortgage, 1 to 4 family junior liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	[1]	7
Accruing loans past due 90 days or more	0		0
TDR loans	24		25
Mortgage, multi-family [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	145	[1]	218
Accruing loans past due 90 days or more	0		0
TDR loans	0		0
Mortgage, commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,009	[1]	597
Accruing loans past due 90 days or more	0		0
TDR loans	937		1,046
Loans to individuals [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	[1]	0
Accruing loans past due 90 days or more	0		0
TDR loans	0		0
Troubled Debt Restructuring [Member]
Summary of certain impaired loan information [Abstract]
TDR Loans included within nonaccrual loans	$ 4,840		$ 3,620
[1]	There were $4.84 million and $3.62 million of TDR loans included within nonaccrual loans as of December 31, 2018 and 2017, respectively.

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)contract	Dec. 31, 2017USD ($)contract
Summary of information for TDR loans [Abstract]
Number of contracts | contract	54	54
Recorded investment	$ 13,375	$ 12,094
Commitments outstanding	$ 166	$ 530
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	18	17
Pre-modification recorded investment	$ 9,098	$ 14,330
Post-modification recorded investment	$ 9,098	$ 14,330
Agricultural [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	5	9
Recorded investment	$ 1,316	$ 3,628
Commitments outstanding	$ 91	$ 321
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	1	6
Pre-modification recorded investment	$ 163	$ 10,890
Post-modification recorded investment	$ 163	$ 10,890
Commercial and financial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	13	14
Recorded investment	$ 3,867	$ 2,575
Commitments outstanding	$ 75	$ 169
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	6	5
Pre-modification recorded investment	$ 2,294	$ 2,051
Post-modification recorded investment	$ 2,294	$ 2,051
Construction, 1 to 4 family residential [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	0	0
Recorded investment	$ 0	$ 0
Commitments outstanding	$ 0	$ 16
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	0	0
Pre-modification recorded investment	$ 0	$ 0
Post-modification recorded investment	$ 0	$ 0
Construction, land development and commercial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	2	2
Recorded investment	$ 328	$ 339
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	1	1
Pre-modification recorded investment	$ 218	$ 231
Post-modification recorded investment	$ 218	$ 231
Mortgage, farmland [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	8	7
Recorded investment	$ 4,291	$ 2,761
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	2	2
Pre-modification recorded investment	$ 4,944	$ 598
Post-modification recorded investment	$ 4,944	$ 598
Mortgage, 1 to 4 family first liens [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	16	13
Recorded investment	$ 1,710	$ 1,442
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	6	2
Pre-modification recorded investment	$ 627	$ 311
Post-modification recorded investment	$ 627	$ 311
Mortgage, 1 to 4 family junior liens [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	1	1
Recorded investment	$ 24	$ 25
Commitments outstanding	$ 0	$ 24
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	0	0
Pre-modification recorded investment	$ 0	$ 0
Post-modification recorded investment	$ 0	$ 0
Mortgage, multi-family [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	0	0
Recorded investment	$ 0	$ 0
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	0	1
Pre-modification recorded investment	$ 0	$ 249
Post-modification recorded investment	$ 0	$ 249
Mortgage, commercial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	9	8
Recorded investment	$ 1,839	$ 1,324
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	2	0
Pre-modification recorded investment	$ 852	$ 0
Post-modification recorded investment	$ 852	$ 0
Loans to individuals [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	0	0
Recorded investment	$ 0	$ 0
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	0	0
Pre-modification recorded investment	$ 0	$ 0
Post-modification recorded investment	$ 0	$ 0

Loans - Impaired Financing Re_2

Loans - Impaired Financing Receivables Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Recorded Investment
With no related allowance recorded	$ 15,201	$ 14,356	$ 12,563
With a related allowance recorded	12,784	17,131	21,101
Total	27,985	31,487	33,664
Unpaid Principal Balance
With no related allowance recorded	19,515	18,735	16,365
With a related allowance recorded	13,023	17,202	21,377
Total	32,538	35,937	37,742
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	2,114	2,166	2,343
Total	2,114	2,166	2,343
Average Recorded Investment
With no related allowance recorded	15,090	15,306	13,425
With an related allowance recorded	13,005	17,810	21,163
Total	28,095	33,116	34,588
Interest Income Recognized
With no related allowance recorded	266	270	195
With an related allowance recorded	527	802	880
Total	793	1,072	1,075
Agricultural [Member]
Recorded Investment
With no related allowance recorded	1,395	1,822	800
With a related allowance recorded	1,065	3,094	10,920
Total	2,460	4,916	11,720
Unpaid Principal Balance
With no related allowance recorded	1,663	2,193	971
With a related allowance recorded	1,229	3,149	10,978
Total	2,892	5,342	11,949
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	479	133	856
Total	479	133	856
Average Recorded Investment
With no related allowance recorded	1,071	2,044	923
With an related allowance recorded	980	3,526	11,258
Total	2,051	5,570	12,181
Interest Income Recognized
With no related allowance recorded	23	19	0
With an related allowance recorded	7	160	464
Total	30	179	464
Commercial and financial [Member]
Recorded Investment
With no related allowance recorded	1,650	1,725	1,540
With a related allowance recorded	2,512	1,043	937
Total	4,162	2,768	2,477
Unpaid Principal Balance
With no related allowance recorded	2,503	2,487	2,175
With a related allowance recorded	2,512	1,043	955
Total	5,015	3,530	3,130
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	1,189	1,018	718
Total	1,189	1,018	718
Average Recorded Investment
With no related allowance recorded	1,977	2,080	1,662
With an related allowance recorded	2,793	1,249	777
Total	4,770	3,329	2,439
Interest Income Recognized
With no related allowance recorded	58	51	18
With an related allowance recorded	107	60	27
Total	165	111	45
Construction, 1 to 4 family residential [Member]
Recorded Investment
With no related allowance recorded	111	114	117
With a related allowance recorded	698	0	815
Total	809	114	932
Unpaid Principal Balance
With no related allowance recorded	148	150	151
With a related allowance recorded	698	0	815
Total	846	150	966
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	4	0	105
Total	4	0	105
Average Recorded Investment
With no related allowance recorded	113	116	131
With an related allowance recorded	622	0	537
Total	735	116	668
Interest Income Recognized
With no related allowance recorded	0	5	6
With an related allowance recorded	28	0	27
Total	28	5	33
Construction, land development and commercial [Member]
Recorded Investment
With no related allowance recorded	328	338	204
With a related allowance recorded	0	505	0
Total	328	843	204
Unpaid Principal Balance
With no related allowance recorded	344	371	290
With a related allowance recorded	0	505	0
Total	344	876	290
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	0	39	0
Total	0	39	0
Average Recorded Investment
With no related allowance recorded	333	344	207
With an related allowance recorded	0	321	0
Total	333	665	207
Interest Income Recognized
With no related allowance recorded	18	14	5
With an related allowance recorded	0	14	0
Total	18	28	5
Mortgage, farmland [Member]
Recorded Investment
With no related allowance recorded	3,612	2,523	2,594
With a related allowance recorded	0	5,439	5,434
Total	3,612	7,962	8,028
Unpaid Principal Balance
With no related allowance recorded	4,071	2,902	2,887
With a related allowance recorded	0	5,439	5,434
Total	4,071	8,341	8,321
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	0	238	390
Total	0	238	390
Average Recorded Investment
With no related allowance recorded	3,068	2,476	2,767
With an related allowance recorded	0	5,596	5,591
Total	3,068	8,072	8,358
Interest Income Recognized
With no related allowance recorded	89	56	67
With an related allowance recorded	0	242	240
Total	89	298	307
Mortgage, 1 to 4 family first liens [Member]
Recorded Investment
With no related allowance recorded	6,089	6,045	5,011
With a related allowance recorded	899	577	1,266
Total	6,988	6,622	6,277
Unpaid Principal Balance
With no related allowance recorded	7,819	7,507	6,137
With a related allowance recorded	974	593	1,374
Total	8,793	8,100	7,511
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	70	63	79
Total	70	63	79
Average Recorded Investment
With no related allowance recorded	6,435	6,286	5,265
With an related allowance recorded	888	585	1,226
Total	7,323	6,871	6,491
Interest Income Recognized
With no related allowance recorded	36	80	53
With an related allowance recorded	25	20	43
Total	61	100	96
Mortgage, 1 to 4 family junior liens [Member]
Recorded Investment
With no related allowance recorded	0	7	153
With a related allowance recorded	24	25	612
Total	24	32	765
Unpaid Principal Balance
With no related allowance recorded	254	482	646
With a related allowance recorded	24	25	667
Total	278	507	1,313
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	2	3	11
Total	2	3	11
Average Recorded Investment
With no related allowance recorded	0	23	186
With an related allowance recorded	25	26	637
Total	25	49	823
Interest Income Recognized
With no related allowance recorded	0	0	0
With an related allowance recorded	1	1	27
Total	1	1	27
Mortgage, multi-family [Member]
Recorded Investment
With no related allowance recorded	145	218	243
With a related allowance recorded	7,447	6,179	0
Total	7,592	6,397	243
Unpaid Principal Balance
With no related allowance recorded	213	355	362
With a related allowance recorded	7,447	6,179	0
Total	7,660	6,534	362
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	305	480	0
Total	305	480	0
Average Recorded Investment
With no related allowance recorded	153	231	288
With an related allowance recorded	7,543	6,247	0
Total	7,696	6,478	288
Interest Income Recognized
With no related allowance recorded	0	0	0
With an related allowance recorded	346	281	0
Total	346	281	0
Real Estate: Mortgage, commercial [Member]
Recorded Investment
With no related allowance recorded	1,871	1,564	1,901
With a related allowance recorded	75	79	967
Total	1,946	1,643	2,868
Unpaid Principal Balance
With no related allowance recorded	2,486	2,274	2,727
With a related allowance recorded	75	79	1,004
Total	2,561	2,353	3,731
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	1	2	34
Total	1	2	34
Average Recorded Investment
With no related allowance recorded	1,940	1,706	1,996
With an related allowance recorded	77	81	986
Total	2,017	1,787	2,982
Interest Income Recognized
With no related allowance recorded	42	45	46
With an related allowance recorded	4	4	36
Total	46	49	82
Loans to individuals [Member]
Recorded Investment
With no related allowance recorded	0	0	0
With a related allowance recorded	64	190	150
Total	64	190	150
Unpaid Principal Balance
With no related allowance recorded	14	14	19
With a related allowance recorded	64	190	150
Total	78	204	169
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	64	190	150
Total	64	190	150
Average Recorded Investment
With no related allowance recorded	0	0	0
With an related allowance recorded	77	179	151
Total	77	179	151
Interest Income Recognized
With no related allowance recorded	0	0	0
With an related allowance recorded	9	20	16
Total	$ 9	$ 20	$ 16

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross	$ 83,804	$ 81,633
Less accumulated depreciation	46,753	43,776
Net	37,051	37,857
Land [Member]
Property, Plant and Equipment [Line Items]
Gross	10,899	10,880
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross	36,815	36,686
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Gross	$ 36,090	$ 34,067

Interest-Bearing Deposits - Sum

Interest-Bearing Deposits - Summary of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Interest-bearing Deposit Liabilities [Abstract]
NOW and other demand	$ 542,388	$ 520,647
Savings	925,214	907,121
Time, $100,000 and over	350,725	315,558
Other time	230,645	181,422
Total deposits	$ 2,048,972	$ 1,924,748

Interest-Bearing Deposits (Narr

Interest-Bearing Deposits (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Interest-bearing Deposit Liabilities [Abstract]
Total brokered deposits	$ 132,460	$ 284,410
Average interest rate of brokered deposits	2.46%	1.35%
Brokered deposits included in savings deposits	$ 132,460	$ 274,130
Brokered deposits included in time deposits	0	10,280
Brokered time-deposits 100000 or more	$ 0	$ 8,570

Interest-Bearing Deposits - Tim

Interest-Bearing Deposits - Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Interest-bearing Deposit Liabilities [Abstract]
Due in one year or less	$ 229,091	$ 167,471
Due after one year through two years	223,254	90,741
Due after two years through three years	44,610	194,530
Due after three years through four years	35,002	40,140
Due over four years	49,413	4,098
Time Deposits	$ 581,370	$ 496,980

Federal Home Loan Bank Borrow_3

Federal Home Loan Bank Borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 215,000,000	$ 295,000,000
Loan borrowed against collateral	0	0
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank Advances	$ 0
Effective interest rates	3.65%
Federal Home Loan Bank Borrowings Due year two [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 0	20,000,000
Effective interest rates	1.67%
Federal Home Loan Bank Borrowings Due year three [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 25,000,000	15,000,000
Effective interest rates	3.05%
Federal Home Loan Bank Borrowings Due year four [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 0	25,000,000
Federal Home Loan Bank Borrowings Due year four [Member] | Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	2.06%
Federal Home Loan Bank Borrowings Due year four [Member] | Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	2.27%
Federal Home Loan Bank Borrowings Due year six [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 0	30,000,000
Effective interest rates	2.44%
Federal Home Loan Bank Borrowings Due year seven [Member] [Domain] [Domain] [Domain]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 25,000,000	15,000,000
Effective interest rates	3.77%
Federal Home Loan Bank Borrowings Due year seven [Member] [Domain] [Domain]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 15,000,000	25,000,000
Effective interest rates	2.38%
Federal Home Loan Bank Borrowings Due year eight [Member] [Domain] [Domain] [Domain]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 90,000,000	15,000,000
Federal Home Loan Bank Borrowings Due year eight [Member] [Domain] [Domain] [Domain] | Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	2.54%
Federal Home Loan Bank Borrowings Due year eight [Member] [Domain] [Domain] [Domain] | Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	3.07%
Federal Home Loan Bank Borrowings Due year nine [Member] [Domain] [Domain] [Domain]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 30,000,000	90,000,000
Federal Home Loan Bank Borrowings Due year nine [Member] [Domain] [Domain] [Domain] | Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	2.52%
Federal Home Loan Bank Borrowings Due year nine [Member] [Domain] [Domain] [Domain] | Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	2.86%
Federal Home Loan Bank Borrowings Due year ten [Member] [Domain]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 30,000,000	30,000,000
Federal Home Loan Bank Borrowings Due year ten [Member] [Domain] | Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	2.76%
Federal Home Loan Bank Borrowings Due year ten [Member] [Domain] | Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	2.95%
Federal Home Loan Bank Borrowings Due thereafter [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings		$ 30,000,000

Federal Home Loan Bank Borrow_4

Federal Home Loan Bank Borrowings (Narrative) (Details) - USD ($)	Feb. 06, 2018	Jan. 17, 2018	Feb. 28, 2018	Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances [Line Items]
FHLB, prepayment borrowings due 2019		$ 15,000,000
FHLB, prepayment borrowings due 2021	$ 15,000,000	$ 15,000,000
FHLB, prepayment borrowings due 2022	$ 15,000,000
FHLB, prepayment fee			$ 0
Federal home loan bank stock				$ 12,172,000	$ 15,005,000
Loans receivable 1 to 4 family mortgage loans Pledged As Collateral				290,250,000	398,250,000
Loans receivable commercial real estate and multi family mortgage loans pledged as collateral				296,530,000	298,850,000
Loan borrowed against collateral				$ 0	$ 0
Federal Home Loan Bank Borrowings Due year three [Member]
Federal Home Loan Bank, Advances [Line Items]
Effective interest rates				3.05%
Federal Home Loan Bank Borrowings Due year five [Member]
Federal Home Loan Bank, Advances [Line Items]
Effective interest rates				2.44%
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
Effective interest rates				3.65%
Minimum [Member] | Federal Home Loan Bank Borrowings Due year eight [Member] [Domain] [Domain] [Domain]
Federal Home Loan Bank, Advances [Line Items]
Effective interest rates				2.54%
Maximum [Member] | Federal Home Loan Bank Borrowings Due year eight [Member] [Domain] [Domain] [Domain]
Federal Home Loan Bank, Advances [Line Items]
Effective interest rates				3.07%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect	$ 1,080	$ 1,514
Net-of-tax amount	(3,250)	(2,446)
Net unrealized gain on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	(2,734)	(1,141)
Net unrealized (loss) gain on derivatives used for cash flow hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	$ (1,596)	$ (2,819)

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percentage of employee cash contributions to ESPP, Minimum	1.00%
Percentage of employee cash contributions to ESPP, Maximum	15.00%
Maximum contribution to ESPP per offering period	$ 9,000
Employee Stock Purchase Plan (ESPP) number of shares purchased	8,172	6,892
Cash contributions to ESOP	$ 1,050,000	$ 1,010,000	$ 920,000
Percentage of cash contributions to ESOP	4.50%	4.50%	4.50%
Employer discretionary contribution amount	$ 1,050,000	$ 1,010,000	$ 920,000
Employer matching contribution	$ 210,000	$ 200,000	$ 180,000
Percentage of cash contributions to profit sharing	4.50%	4.50%	0.00%
Maximum number of options and shares granted	188,000
Award expiration period	10 years
Directors' and officers' rights under the plan vesting period	5 years
Intrinsic Value, option exercised	$ 30,000	$ 240,000	$ 0
Period of interest rate swap used to calculate expected life of options	10 years
Stock options granted (in shares)	0	0	0
Stock option outstanding weighted-average exercise price (in dollars per share)	$ 33.30
Stock options outstanding, weighted average remaining contractual life	3 years 4 months 29 days
Number of exercisable stock options	9,020
Stock options exercisable, weighted average exercise price (in dollars per share)	$ 33.30
Number of shares available for stock options (in shares)	38,125
Restricted common stock shares subject to forfeiture upon termination	15,200	15,200	10,400
Number of years of employment subject to forfeiture	8 years	8 years	8 years
Restricted Stock [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Directors' and officers' rights under the plan vesting period	5 years
Number of shares available for stock options (in shares)	38,125	59,728
Number of restricted shares authorized	24,899	27,407	23,163
Expense relating to awards	$ 850,000	$ 580,000	$ 560,000
Director [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation liability recorded in other liabilities	3,520,000	2,950,000
Deferred compensation expenses included in other noninterest expense	$ 430,000	370,000	220,000
Director [Member] | Maximum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percentage of cash contributions to profit sharing	50.00%
Executive Officer [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation liability recorded in other liabilities	$ 5,900,000	6,340,000
Deferred compensation expenses included in salaries and employee benefits expense	$ 850,000	$ 810,000	$ 510,000
Executive Officer [Member] | Maximum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percentage of deferment of base compensation	30.00%
Percentage of deferment of bonus	100.00%

Employee Benefit Plans - Shares

Employee Benefit Plans - Shares Held by ESOP (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Shares held by the ESOP	801,147	802,003
Fair value per share	$ 61	$ 54
Maximum cash obligation	$ 48,870,000	$ 43,308,000

Employee Benefit Plans - Summar

Employee Benefit Plans - Summary of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of interest rate swap used to calculate expected life of options	10 years
Number of shares available for stock options (in shares)	38,125
Issuance of common stock (in shares)	113,373	114,935	23,163
Forfeiture Of Shares Of Common Stock Shares (in shares)	3,296	3,934	1,264
Number of Shares
Options Outstanding Beginning Balance (in shares)	10,220	19,380	19,380
Granted (in shares)	0	0	0
Exercised (in shares)	(1,200)	(9,160)	0
Options Outstanding Ending Balance (in shares)	9,020	10,220	19,380	19,380
Weighted- Average Exercise Price
Options Outstanding Weighted Average Exercise Price Beginning Balance (in dollars per share)	$ 33.44	$ 29.92	$ 29.92
Options Outstanding Weighted Average Exercise Price Ending Balance (in dollars per share)	$ 33.30	$ 33.44	$ 29.92	$ 29.92
Weighted-Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term	3 years 4 months 28 days	4 years 5 months 12 days	3 years 11 days	4 years 11 days
Aggregate Intrinsic Value (In Thousands)
Aggregate Intrinsic Value	$ 250	$ 342	$ 580	$ 580
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for stock options (in shares)	38,125	59,728
Issuance of common stock (in shares)	24,899
Weighted average number of net shares issued (redeemed)	$ 58.90
Forfeiture Of Shares Of Common Stock Shares (in shares)	3,296
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value	$ 46.19

Employee Benefit Plans - Other

Employee Benefit Plans - Other Pertinent Information Related to Options (Details)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Defined Benefit Plan Disclosure [Line Items]
Stock option outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 33.30
Number Outstanding (in shares)	9,020
Remaining Contractual Life	3 years 4 months 29 days
Number of exercisable stock options	9,020
Exercise Price 33.00 [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock option outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 33
Number Outstanding (in shares)	7,220
Remaining Contractual Life	40 months
Number of exercisable stock options	7,220
Exercise Price 34.50 [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock option outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 34.50
Number Outstanding (in shares)	1,800
Remaining Contractual Life	46 months
Number of exercisable stock options	1,800

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Taxes (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
Current:
Federal									$ 7,783	$ 13,770	$ 11,650
State									3,093	2,529	2,320
Deferred:
Federal									(1,560)	3,426	435
State									(411)	(188)	(11)
Total	$ 1,140	$ 2,590	$ 2,603	$ 2,572	$ 9,065	$ 3,722	$ 2,783	$ 3,967	$ 8,905	$ 19,537	$ 14,394

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets:
Allowance for loan losses	$ 9,434	$ 7,335
Deferred compensation	2,211	2,202
Unrealized losses on interest rate swaps	398	703
Accrued expenses	668	688
State net operating loss	795	836
Unrealized losses on investment securities	682	285
Gross deferred tax assets	14,188	12,049
Valuation allowance	(795)	(836)
Deferred tax asset, net of valuation allowance	13,393	11,213
Deferred income tax liabilities:
Property and equipment	1,728	1,652
Goodwill	407	407
Other	389	348
Gross deferred tax liabilities	2,524	2,407
Net deferred tax assets	$ 10,869	$ 8,806

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Valuation allowance (decrease) increase	$ (41,000)	$ 57,000
Income tax expense, reduction of deferred tax assets, Tax Cuts and Jobs Act of 2017		$ 4,710,000
Effective income tax rate increase		30.99%
Effective income tax rate	19.50%	41.00%	31.30%
Unrecognized tax benefits	$ 0	$ 0
Interest or penalties on unrecognized tax benefits	0	$ 0
Anticipated increase in unrecognized tax benefits next twelve months	0
Anticipated decrease in unrecognized tax benefits next twelve months	$ 0
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Income tax year, under examination	December 31, 2018, 2017, 2016 and 2015
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Income tax year, under examination	December 31, 2018, 2017, 2016 and 2015

Income Taxes - Summary of Chang

Income Taxes - Summary of Change in Deferred Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Consolidated statements of income	$ 1,971	$ (3,238)	$ (424)
Consolidated statements of stockholders' equity	92	(567)	1,340
Net change in deferred income tax	$ 2,063	$ (3,805)	$ 916

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	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
Reconciliation of effective income tax rate with federal statutory tax rate
Expected tax expense, Amount									$ 9,591,000	$ 16,659,000	$ 16,082,000
Expected tax expense, Percent Of Pretax Income									21.00%	35.00%	35.00%
Tax-exempt interest, Amount									$ (1,122,000)	$ (1,771,000)	$ (1,715,000)
Tax-exempt interest, Percent Of Pretax Income									(2.50%)	(3.70%)	(3.70%)
Interest expense limitation, Amount									$ 87,000	$ 103,000	$ 96,000
Interest expenses limitation, Percent Of Pretax Income									0.20%	0.20%	0.20%
State income taxes, net of federal income tax benefit, Amount									$ 2,119,000	$ 1,522,000	$ 1,501,000
State income taxes, net of federal income tax benefit, Percent Of Pretax Income									4.60%	3.20%	3.20%
Income tax credits, Amount									$ (1,292,000)	$ (1,426,000)	$ (1,426,000)
Income tax credits, Percent Of Pretax Income									(2.80%)	(3.00%)	(3.10%)
Effective income tax rate reconciliation, deferred tax revaluation, amount									$ 0	$ 4,710,000	$ 0
Effective income tax rate reconciliation, deferred tax revaluation, percent									0.00%	9.90%	0.00%
Other, Amount									$ (478,000)	$ (260,000)	$ (144,000)
Other, Percent Of Pretax Income									(1.00%)	(0.60%)	(0.30%)
Total	$ 1,140,000	$ 2,590,000	$ 2,603,000	$ 2,572,000	$ 9,065,000	$ 3,722,000	$ 2,783,000	$ 3,967,000	$ 8,905,000	$ 19,537,000	$ 14,394,000
Total, Percent Of Pretax Income									19.50%	41.00%	31.30%
Unrecognized tax benefits	$ 0				$ 0				$ 0	$ 0
Income Tax Examination, Penalties and Interest Expense									$ 0	$ 0

Regulatory Capital Requiremen_3

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Parent Company [Member]
Minimum regulatory requirements [Abstract]
Total risk-based capital, Actual Amount	$ 414,772	$ 383,766
Total risk-based capital, Actual Ratio	17.18%	16.66%
Total risk-based capital, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 risk-based capital, Actual Amount	$ 384,502	$ 354,970
Tier 1 risk-based capital, Actual Ratio	15.93%	15.41%
Tier 1 risk-based capital, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Tier one common equity capital, Actual Amount	$ 384,502	$ 354,970
Tier one common equity capital to risk weighted assets	15.93%	15.41%
Tier One Minimum Capital Requirement to Common Equity	4.50%	4.50%
Tier One Common Equity Capital to be Well Capitalized	6.50%	6.50%
Leverage ratio, Actual Amount	$ 384,502	$ 354,970
Leverage ratio, Actual Ratio	12.68%	12.34%
Leverage ratio, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Leverage ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Bank [Member]
Minimum regulatory requirements [Abstract]
Total risk-based capital, Actual Amount	$ 416,198	$ 384,181
Total risk-based capital, Actual Ratio	17.25%	16.69%
Total risk-based capital, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 risk-based capital, Actual Amount	$ 385,943	$ 355,402
Tier 1 risk-based capital, Actual Ratio	16.00%	15.44%
Tier 1 risk-based capital, For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Tier one common equity capital, Actual Amount	$ 385,943	$ 355,402
Tier one common equity capital to risk weighted assets	16.00%	15.44%
Tier One Minimum Capital Requirement to Common Equity	4.50%	4.50%
Tier One Common Equity Capital to be Well Capitalized	6.50%	6.50%
Leverage ratio, Actual Amount	$ 385,943	$ 355,402
Leverage ratio, Actual Ratio	12.73%	12.36%
Leverage ratio, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Leverage ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%

Regulatory Capital Requiremen_4

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions [Abstract]
Retained Earnings, available for payment of dividends	$ 192,920
Cash reserve balances	$ 14,680	$ 139,120

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Changes in loans to related parties [Roll Forward]
Balance, beginning	$ 42,496	$ 30,532
Net increase (decrease) due to change in related parties	188	(59)
Advances	28,194	28,305
Collections	(19,662)	(16,282)
Balance, ending	51,216	42,496
Related Party Deposits	$ 7,130	$ 9,240

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Value and Estimated Fair Values (Details) - USD ($) $ in Thousands		Dec. 31, 2018		Dec. 31, 2017
Readily Available Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents		$ 43,305	[1]	$ 154,353	[2]
Investment securities		83,155	[1]	54,318	[2]
Loans held for sale		0	[1]	0	[2]
Loans
Agricultural		0	[1]	0	[2]
Commercial and financial		0	[1]	0	[2]
Real estate:
Construction, 1 to 4 family residential		0	[1]	0	[2]
Construction, land development and commercial		0	[1]	0	[2]
Mortgage, farmland		0	[1]	0	[2]
Mortgage, 1 to 4 family first liens		0	[1]	0	[2]
Mortgage, 1 to 4 family junior liens		0	[1]	0	[2]
Mortgage, multi-family		0	[1]	0	[2]
Mortgage, commercial		0	[1]	0	[2]
Loans to individuals		0	[1]	0	[2]
Obligations of state and political subdivisions		0	[1]	0	[2]
Accrued interest receivable		0	[1]	0	[2]
Total financial instrument assets		126,460	[1]	208,671	[2]
Deposits
Noninterest-bearing deposits		0	[1]	0	[2]
Deposits Interest Bearing Fair Value Disclosure		0	[1]	0	[2]
Federal Home Loan Bank borrowings		0	[1]	0	[2]
Interest rate swaps	[1]	0		0
Accrued interest payable		0	[1]	0	[2]
Total financial instrument liabilities		0	[1]	0	[2]
Financial instrument with off-balance sheet risk:
Loan commitments		0	[1]	0	[2]
Letters of credit		0	[1]	0	[2]
Total financial instrument liabilities with off-balance-sheet risk		0	[1]	0	[2]
Observable Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents		0	[3]	0	[4]
Investment securities		247,943	[3]	245,842	[4]
Loans held for sale		1,984	[3]	5,162	[4]
Loans
Agricultural		0	[3]	0	[4]
Commercial and financial		0	[3]	0	[4]
Real estate:
Construction, 1 to 4 family residential		0	[3]	0	[4]
Construction, land development and commercial		0	[3]	0	[4]
Mortgage, farmland		0	[3]	0	[4]
Mortgage, 1 to 4 family first liens		0	[3]	0	[4]
Mortgage, 1 to 4 family junior liens		0	[3]	0	[4]
Mortgage, multi-family		0	[3]	0	[4]
Mortgage, commercial		0	[3]	0	[4]
Loans to individuals		0	[3]	0	[4]
Obligations of state and political subdivisions		0	[3]	0	[4]
Accrued interest receivable		11,784	[3]	10,772	[4]
Total financial instrument assets		261,711	[3]	261,776	[4]
Deposits
Noninterest-bearing deposits		372,152	[3]	363,817	[4]
Deposits Interest Bearing Fair Value Disclosure		2,059,336	[3]	1,934,442	[4]
Federal Home Loan Bank borrowings		207,948	[3]	284,442	[4]
Interest rate swaps	[3]	1,596		2,819
Accrued interest payable		1,812	[3]	1,290	[4]
Total financial instrument liabilities		2,642,844	[3]	2,586,810	[4]
Financial instrument with off-balance sheet risk:
Loan commitments		0	[3]	0	[4]
Letters of credit		0	[3]	0	[4]
Total financial instrument liabilities with off-balance-sheet risk		0	[3]	0	[4]
Company Determined Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents		0	[5]	0	[6]
Investment securities		0	[5]	0	[6]
Loans held for sale		0	[5]	0	[6]
Loans
Agricultural		93,736	[5]	86,229	[6]
Commercial and financial		227,774	[5]	212,244	[6]
Real estate:
Construction, 1 to 4 family residential		72,419	[5]	69,036	[6]
Construction, land development and commercial		112,960	[5]	108,651	[6]
Mortgage, farmland		235,771	[5]	211,947	[6]
Mortgage, 1 to 4 family first liens		882,908	[5]	818,083	[6]
Mortgage, 1 to 4 family junior liens		148,128	[5]	142,180	[6]
Mortgage, multi-family		342,099	[5]	329,344	[6]
Mortgage, commercial		376,257	[5]	353,796	[6]
Loans to individuals		29,962	[5]	25,610	[6]
Obligations of state and political subdivisions		51,945	[5]	55,066	[6]
Accrued interest receivable		0	[5]	0	[6]
Total financial instrument assets		2,573,959	[5]	2,412,186	[6]
Deposits
Noninterest-bearing deposits		0	[5]	0	[6]
Deposits Interest Bearing Fair Value Disclosure		0	[5]	0	[6]
Federal Home Loan Bank borrowings		0	[5]	0	[6]
Interest rate swaps	[5]	0		0
Accrued interest payable		0	[5]	0	[6]
Total financial instrument liabilities		0	[5]	0	[6]
Financial instrument with off-balance sheet risk:
Loan commitments		0	[5]	0	[6]
Letters of credit		0	[5]	0	[6]
Total financial instrument liabilities with off-balance-sheet risk		0	[5]	0	[6]
Carrying Amount [Member]
Financial instrument assets:
Cash and cash equivalents		43,305		154,353
Investment securities		331,098		300,160
Loans held for sale		1,984		5,162
Loans
Agricultural		89,884		86,286
Commercial and financial		223,675		213,795
Real estate:
Construction, 1 to 4 family residential		70,982		68,545
Construction, land development and commercial		111,812		107,799
Mortgage, farmland		232,482		211,617
Mortgage, 1 to 4 family first liens		902,261		824,222
Mortgage, 1 to 4 family junior liens		150,859		142,901
Mortgage, multi-family		348,351		334,019
Mortgage, commercial		379,232		358,287
Loans to individuals		29,349		25,635
Obligations of state and political subdivisions		52,198		57,165
Accrued interest receivable		11,784		10,772
Total financial instrument assets		2,979,256		2,900,718
Deposits
Noninterest-bearing deposits		372,152		363,817
Deposits Interest Bearing Fair Value Disclosure		2,048,972		1,924,748
Federal Home Loan Bank borrowings		215,000		295,000
Interest rate swaps		1,596		2,819
Accrued interest payable		1,812		1,290
Total financial instrument liabilities		2,639,532		2,587,674
Financial instrument with off-balance sheet risk:
Loan commitments		375,940		380,877
Letters of credit		9,033		9,113
Total financial instrument liabilities with off-balance-sheet risk		384,973		389,990
Estimated Fair Value [Member]
Financial instrument assets:
Cash and cash equivalents		43,305		154,353
Investment securities		331,098		300,160
Loans held for sale		1,984		5,162
Loans
Agricultural		93,736		86,229
Commercial and financial		227,774		212,244
Real estate:
Construction, 1 to 4 family residential		72,419		69,036
Construction, land development and commercial		112,960		108,651
Mortgage, farmland		235,771		211,947
Mortgage, 1 to 4 family first liens		882,908		818,083
Mortgage, 1 to 4 family junior liens		148,128		142,180
Mortgage, multi-family		342,099		329,344
Mortgage, commercial		376,257		353,796
Loans to individuals		29,962		25,610
Obligations of state and political subdivisions		51,945		55,066
Accrued interest receivable		11,784		10,772
Total financial instrument assets		2,962,130		2,882,633
Deposits
Noninterest-bearing deposits		372,152		363,817
Deposits Interest Bearing Fair Value Disclosure		2,059,336		1,934,442
Federal Home Loan Bank borrowings		207,948		284,442
Interest rate swaps		1,596		2,819
Accrued interest payable		1,812		1,290
Total financial instrument liabilities		2,642,844		2,586,810
Financial instrument with off-balance sheet risk:
Loan commitments		0		0
Letters of credit		0		0
Total financial instrument liabilities with off-balance-sheet risk		$ 0		$ 0
[1]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[2]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[3]	Considered Level 2 under ASC 820.
[4]	Considered Level 2 under ASC 820.
[5]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
[6]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Recurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		$ 318,926	$ 285,155
US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		83,155	54,318
State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		200,900	186,878
Readily Available Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability	[1]	0	0
Observable Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability	[2]	(1,596)	(2,819)
Company Determined Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability	[3]	0	0
Recurring Basis [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total		317,330	282,336
Recurring Basis [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		83,155	54,318
Recurring Basis [Member] | State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		200,900	186,878
Recurring Basis [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		34,871	43,959
Recurring Basis [Member] | Derivative Financial Instruments, Liabilities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability		(1,596)
Recurring Basis [Member] | Derivative Financial Instruments, Assets [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative asset			(2,819)
Recurring Basis [Member] | Readily Available Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	[4]	83,155	54,318
Recurring Basis [Member] | Readily Available Market Prices [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[4]	83,155	54,318
Recurring Basis [Member] | Readily Available Market Prices [Member] | State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[4]	0	0
Recurring Basis [Member] | Readily Available Market Prices [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[4]	0	0
Recurring Basis [Member] | Readily Available Market Prices [Member] | Derivative Financial Instruments, Assets [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative asset	[4]		0
Recurring Basis [Member] | Observable Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	[5]	234,175	228,018
Recurring Basis [Member] | Observable Market Prices [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[5]	0	0
Recurring Basis [Member] | Observable Market Prices [Member] | State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[5]	200,900	186,878
Recurring Basis [Member] | Observable Market Prices [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[5]	34,871	43,959
Recurring Basis [Member] | Observable Market Prices [Member] | Derivative Financial Instruments, Liabilities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability	[5]	(1,596)
Recurring Basis [Member] | Observable Market Prices [Member] | Derivative Financial Instruments, Assets [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative asset	[5]		(2,819)
Recurring Basis [Member] | Company Determined Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	[6]	0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[6]	0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[6]	0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[6]	$ 0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | Derivative Financial Instruments, Assets [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative asset	[6]		$ 0
[1]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[2]	Considered Level 2 under ASC 820.
[3]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
[4]	Considered Level 1 under ASC 820.
[5]	Considered Level 2 under ASC 820.
[6]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets and Liabilities on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017
Readily Available Market Prices [Member]
Loans
Agricultural	$ 0	[1]	$ 0	[2]
Commercial and financial	0	[1]	0	[2]
Real Estate:
Construction, land development and commercial	0	[1]	0	[2]
Mortgage, farmland	0	[1]	0	[2]
Mortgage, 1 to 4 family first liens	0	[1]	0	[2]
Mortgage, 1 to 4 family junior liens	0	[1]	0	[2]
Mortgage, multi-family	0	[1]	0	[2]
Mortgage, commercial	0	[1]	0	[2]
Loans to individuals	0	[1]	0	[2]
Total financial instrument assets	126,460	[1]	208,671	[2]
Observable Market Prices [Member]
Loans
Agricultural	0	[3]	0	[4]
Commercial and financial	0	[3]	0	[4]
Real Estate:
Construction, land development and commercial	0	[3]	0	[4]
Mortgage, farmland	0	[3]	0	[4]
Mortgage, 1 to 4 family first liens	0	[3]	0	[4]
Mortgage, 1 to 4 family junior liens	0	[3]	0	[4]
Mortgage, multi-family	0	[3]	0	[4]
Mortgage, commercial	0	[3]	0	[4]
Loans to individuals	0	[3]	0	[4]
Total financial instrument assets	261,711	[3]	261,776	[4]
Company Determined Market Prices [Member]
Loans
Agricultural	93,736	[5]	86,229	[6]
Commercial and financial	227,774	[5]	212,244	[6]
Real Estate:
Construction, land development and commercial	112,960	[5]	108,651	[6]
Mortgage, farmland	235,771	[5]	211,947	[6]
Mortgage, 1 to 4 family first liens	882,908	[5]	818,083	[6]
Mortgage, 1 to 4 family junior liens	148,128	[5]	142,180	[6]
Mortgage, multi-family	342,099	[5]	329,344	[6]
Mortgage, commercial	376,257	[5]	353,796	[6]
Loans to individuals	29,962	[5]	25,610	[6]
Total financial instrument assets	2,573,959	[5]	2,412,186	[6]
Nonrecurring Basis [Member]
Loans
Agricultural	1,160	[7]	4,704	[8]
Commercial and financial	2,882	[7]	1,555	[8]
Real Estate:
Construction, 1 to 4 family residential	0	[7]	0	[8]
Construction, land development and commercial	703	[7]	729	[8]
Mortgage, farmland	3,848	[7]	7,190	[8]
Mortgage, 1 to 4 family first liens	6,729	[7]	5,548	[8]
Mortgage, 1 to 4 family junior liens	22	[7]	25	[8]
Mortgage, multi-family	7,286	[7]	6,397	[8]
Mortgage, commercial	1,458	[7]	1,063	[8]
Loans to individuals	0	[7]	0	[8]
Foreclosed assets	0	[9]	0	[10]
Total financial instrument assets	24,088	[7]	27,211	[8]
Total Losses	1,114	[7]	909	[8]
Nonrecurring Basis [Member] | Readily Available Market Prices [Member]
Loans
Agricultural	0	[7],[11]	0	[8],[12]
Commercial and financial	0	[7],[11]	0	[8],[12]
Real Estate:
Construction, 1 to 4 family residential	0	[7],[11]	0	[8],[12]
Construction, land development and commercial	0	[7],[11]	0	[8],[12]
Mortgage, farmland	0	[7],[11]	0	[8],[12]
Mortgage, 1 to 4 family first liens	0	[7],[11]	0	[8],[12]
Mortgage, 1 to 4 family junior liens	0	[7],[11]	0	[8],[12]
Mortgage, multi-family	0	[7],[11]	0	[8],[12]
Mortgage, commercial	0	[7],[11]	0	[8],[12]
Loans to individuals	0	[7],[11]	0	[8],[12]
Foreclosed assets	0	[9],[11]	0	[10],[12]
Total financial instrument assets	0	[11]	0	[12]
Nonrecurring Basis [Member] | Observable Market Prices [Member]
Loans
Agricultural	0	[7],[13]	0	[8],[14]
Commercial and financial	0	[7],[13]	0	[8],[14]
Real Estate:
Construction, 1 to 4 family residential	0	[7],[13]	0	[8],[14]
Construction, land development and commercial	0	[7],[13]	0	[8],[14]
Mortgage, farmland	0	[7],[13]	0	[8],[14]
Mortgage, 1 to 4 family first liens	0	[7],[13]	0	[8],[14]
Mortgage, 1 to 4 family junior liens	0	[7],[13]	0	[8],[14]
Mortgage, multi-family	0	[7],[13]	0	[8],[14]
Mortgage, commercial	0	[7],[13]	0	[8],[14]
Loans to individuals	0	[7],[13]	0	[8],[14]
Foreclosed assets	0	[9],[13]	0	[10],[14]
Total financial instrument assets	0	[13]	0	[14]
Nonrecurring Basis [Member] | Company Determined Market Prices [Member]
Loans
Agricultural	1,160	[7],[15]	4,704	[8],[16]
Commercial and financial	2,882	[7],[15]	1,555	[8],[16]
Real Estate:
Construction, 1 to 4 family residential	0	[7],[15]	0	[8],[16]
Construction, land development and commercial	703	[7],[15]	729	[8],[16]
Mortgage, farmland	3,848	[7],[15]	7,190	[8],[16]
Mortgage, 1 to 4 family first liens	6,729	[7],[15]	5,548	[8],[16]
Mortgage, 1 to 4 family junior liens	22	[7],[15]	25	[8],[16]
Mortgage, multi-family	7,286	[7],[15]	6,397	[8],[16]
Mortgage, commercial	1,458	[7],[15]	1,063	[8],[16]
Loans to individuals	0	[7],[15]	0	[8],[16]
Foreclosed assets	0	[9],[15]	0	[10],[16]
Total financial instrument assets	24,088	[15]	27,211	[16]
Agricultural [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	63	[7]	127	[8]
Commercial and financial [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	122	[7]	159	[8]
Construction, 1 to 4 family residential [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	0	[8]
Construction, land development and commercial [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	0	[8]
Mortgage, farmland [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	0	[8]
Mortgage, 1 to 4 family first liens [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	520	[7]	404	[8]
Mortgage, 1 to 4 family junior liens [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	60	[7]	88	[8]
Mortgage, multi-family [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	0	[8]
Real Estate: Mortgage, commercial [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	349	[7]	111	[8]
Loans to individuals [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	20	[8]
Foreclosed assets [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	$ 0	[9]	$ 0	[10]
[1]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[2]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[3]	Considered Level 2 under ASC 820.
[4]	Considered Level 2 under ASC 820.
[5]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
[6]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market
[7]	Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero.
[8]	Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero.
[9]	Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.
[10]	Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.
[11]	Considered Level 1 under ASC 820.
[12]	Considered Level 1 under ASC 820.
[13]	Considered Level 2 under ASC 820.
[14]	Considered Level 2 under ASC 820.
[15]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
[16]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.

Parent Company Only Financial_3

Parent Company Only Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents at subsidiary bank	$ 43,305	$ 154,353
Investment in subsidiary bank	318,926	285,155
Other assets	3,595	2,509
Total Assets	3,042,464	2,963,360
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities	2,658,712	2,608,336
Redeemable common stock held by ESOP	48,870	43,308
Stockholders' equity:
Capital stock	0	0
Retained earnings	371,848	341,558
Accumulated other comprehensive loss	(3,250)	(2,446)
Treasury stock at cost	(36,968)	(33,018)
Total Stockholders' Equity	383,752	355,024
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	334,882	311,716	$ 289,270	$ 272,175
Total Liabilities & Stockholders' Equity	3,042,464	2,963,360
Parent Company [Member]
ASSETS
Cash and cash equivalents at subsidiary bank	3,742	4,015	$ 543	$ 843
Investment in subsidiary bank	385,193	355,456
Other assets	1,231	1,393
Total Assets	390,166	360,864
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities	6,414	5,840
Redeemable common stock held by ESOP	48,870	43,308
Stockholders' equity:
Capital stock	52,122	48,930
Retained earnings	371,848	341,558
Accumulated other comprehensive loss	(3,250)	(2,446)
Treasury stock at cost	(36,968)	(33,018)
Total Stockholders' Equity	383,752	355,024
Less maximum cash obligation related to ESOP shares	48,870	43,308
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	334,882	311,716
Total Liabilities & Stockholders' Equity	$ 390,166	$ 360,864

Parent Company Only Financial_4

Parent Company Only Financial Information - Condensed Statements 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
Condensed Financial Statements, Captions [Line Items]
Income before income taxes	$ 6,936	$ 12,640	$ 12,666	$ 13,430	$ 13,243	$ 12,274	$ 9,240	$ 12,841	$ 45,672	$ 47,598	$ 45,949
Income tax benefit	(1,140)	(2,590)	(2,603)	(2,572)	(9,065)	(3,722)	(2,783)	(3,967)	(8,905)	(19,537)	(14,394)
Net income	$ 5,796	$ 10,050	$ 10,063	$ 10,858	$ 4,178	$ 8,552	$ 6,457	$ 8,874	36,767	28,061	31,555
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiary									11,502	7,485	8,560
Other expenses									(786)	(741)	(570)
Income before income taxes									10,716	6,744	7,990
Income tax benefit									273	73	292
Total income after tax benefit									10,989	6,817	8,282
Equity in undistributed income of subsidiary									25,778	21,244	23,273
Net income									$ 36,767	$ 28,061	$ 31,555

Parent Company Only Financial_5

Parent Company Only Financial Information - Condensed 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	$ 5,796	$ 10,050	$ 10,063	$ 10,858	$ 4,178	$ 8,552	$ 6,457	$ 8,874	$ 36,767	$ 28,061	$ 31,555
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:
Share-based compensation									0	11	29
Compensation expensed through issuance of common stock									1,466	1,446	1,078
Excess tax benefits related to share-based compensation									0	0	(70)
Forfeiture of common stock									(152)	(156)	(52)
(Increase) decrease in other assets									(1,086)	972	104
Net cash and cash equivalents provided by operating activities									47,738	45,898	28,880
Cash Flows from Financing Activities
Issuance of common stock, net of costs									4,713	3,762	0
Stock options exercised									41	238	0
Excess tax benefits related to share-based compensation									0	0	70
Purchase of treasury stock									(6,784)	(2,435)	(3,926)
Proceeds from the issuance of common stock through the employee stock purchase plan									421	325	254
Dividends paid									(7,003)	(6,485)	(6,060)
Net cash and cash equivalents used by financing activities									43,947	274,169	135,386
(Decrease) increase in cash and cash equivalents									(111,048)	116,156	2,770
Cash and cash equivalents:
Beginning of year				154,353					154,353
Ending of year	43,305				154,353				43,305	154,353
Parent Company [Member]
Cash flows from operating activities:
Net income									36,767	28,061	31,555
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:
Equity in undistributed income of subsidiary									(25,778)	(21,244)	(23,273)
Share-based compensation									0	11	29
Compensation expensed through issuance of common stock									1,466	1,446	1,078
Excess tax benefits related to share-based compensation									0	0	(70)
Forfeiture of common stock									(152)	(156)	(52)
(Increase) decrease in other assets									162	237	(8)
Increase in other liabilities									574	3,212	103
Net cash and cash equivalents provided by operating activities									13,039	11,567	9,362
Cash Flows from Financing Activities
Issuance of common stock, net of costs									4,713	3,762	0
Stock options exercised									41	238	0
Excess tax benefits related to share-based compensation									0	0	70
Purchase of treasury stock									(6,784)	(2,435)	(3,926)
Proceeds from the issuance of common stock through the employee stock purchase plan									421	325	254
Capital contribution to subsidiary									(4,700)	(3,500)	0
Dividends paid									(7,003)	(6,485)	(6,060)
Net cash and cash equivalents used by financing activities									(13,312)	(8,095)	(9,662)
(Decrease) increase in cash and cash equivalents									(273)	3,472	(300)
Cash and cash equivalents:
Beginning of year				$ 4,015				$ 543	4,015	543	843
Ending of year	$ 3,742				$ 4,015				$ 3,742	$ 4,015	$ 543

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Investment in securities issued by state and political subdivisions within the state of Iowa	$ 97,420,000
Liabilities for potential obligations from standby letters of credit issued	0	$ 0
Rent expense	$ 360,000	$ 370,000	$ 360,000

Commitments and Contingencies -

Commitments and Contingencies - Summary of Bank's Commitments (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Off-balance sheet liability [Line Items]
Liabilities for potential obligations from standby letters of credit issued	$ 0	$ 0
Home equity loans [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	59,330,000	55,171,000
Credit cards [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	52,802,000	49,235,000
Commercial, real estate and home construction [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	89,171,000	117,021,000
Commercial lines and real estate purchase loans [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	174,637,000	159,450,000
Outstanding letters of credit [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	$ 9,033,000	$ 9,113,000

Commitments and Contingencies_3

Commitments and Contingencies - Minimum Future Rental Commitments (Details) $ in Thousands	Dec. 31, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,019	$ 464
2,020	467
2,021	371
2,022	315
2,023	308
Thereafter	80
Total	$ 2,005

Quarterly Results of Operatio_3

Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts) (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
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 31,291	$ 30,411	$ 29,064	$ 28,031	$ 27,767	$ 26,872	$ 26,133	$ 25,180	$ 118,797	$ 105,952	$ 97,677
Net interest income	7,453	6,891	6,241	5,738	5,155	4,652	4,182	3,983	26,323	17,972	16,087
Net interest income	23,838	23,520	22,823	22,293	22,612	22,220	21,951	21,197	92,474	87,980	81,590
Provision for loan losses	6,958	1,593	711	(765)	(139)	130	2,511	(814)	8,497	1,688	(1,163)
Other income	5,288	6,668	6,234	5,628	5,571	5,005	5,001	5,241	23,818	20,818	19,995
Other expense	15,232	15,955	15,680	15,256	15,079	14,821	15,201	14,411	62,123	59,512	56,799
Income before income taxes	6,936	12,640	12,666	13,430	13,243	12,274	9,240	12,841	45,672	47,598	45,949
Income taxes	1,140	2,590	2,603	2,572	9,065	3,722	2,783	3,967	8,905	19,537	14,394
Net income	$ 5,796	$ 10,050	$ 10,063	$ 10,858	$ 4,178	$ 8,552	$ 6,457	$ 8,874	$ 36,767	$ 28,061	$ 31,555
Basic earnings per share (in dollars per share)	$ 0.63	$ 1.07	$ 1.07	$ 1.16	$ 0.45	$ 0.92	$ 0.69	$ 0.95	$ 3.93	$ 3.01	$ 3.40
Diluted earnings per share (in dollars per share)	$ 0.62	$ 1.07	$ 1.07	$ 1.16	$ 0.45	$ 0.92	$ 0.69	$ 0.95	$ 3.92	$ 3.01	$ 3.40

Derivative Financial Instrume_3

Derivative Financial Instruments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Nov. 07, 2013USD ($)derivative
Derivatives, Fair Value [Line Items]
Collateral required by the bank	$ 1,600,000
Interest Rate Swap 1 [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional amount			$ 25,000,000
Interest Rate Swap 2 [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional amount			$ 25,000,000
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Number of interest rate swaps held | derivative			2
Description of terms	three-month LIBOR
Designated as Hedging Instrument [Member] | Interest Rate Swap 1 [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Maturity date	Nov. 9, 2020
Designated as Hedging Instrument [Member] | Interest Rate Swap 1 [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional amount	$ 25,000,000	$ 25,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap 2 [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Maturity date	Nov. 7, 2023
Designated as Hedging Instrument [Member] | Interest Rate Swap 2 [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional amount	$ 25,000,000	$ 25,000,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Balance Sheet Category and Fair Value for Cash Flow Hedges (Details) - Other Liabilities [Member] - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Nov. 07, 2013
Interest Rate Swap 1 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			$ 25,000,000
Interest Rate Swap 2 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			$ 25,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap 1 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 25,000,000	$ 25,000,000
Fair Value	(120,000)	(582,000)
Designated as Hedging Instrument [Member] | Interest Rate Swap 2 [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	25,000,000	25,000,000
Fair Value	$ (1,476,000)	$ (2,237,000)

Derivative Financial Instrume_5

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Net change in unrealized gain on derivatives	$ 1,223	$ 1,119	$ 242
Designated as Hedging Instrument [Member] | Interest Rate Swap 1 [Member] | Interest Expense [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Net change in unrealized gain on derivatives	347	318
Amount of Gain (Loss), Reclassified from AOCI into Income, Effective Portion	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap 1 [Member] | Other Income [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Amount of Gain (Loss), Recognized in Income on Derivatives, Ineffective Portion	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap 2 [Member] | Interest Expense [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Net change in unrealized gain on derivatives	571	373
Amount of Gain (Loss), Reclassified from AOCI into Income, Effective Portion	0	0
Designated as Hedging Instrument [Member] | Interest Rate Swap 2 [Member] | Other Income [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Amount of Gain (Loss), Recognized in Income on Derivatives, Ineffective Portion	$ 0	$ 0

Subsequent Events (Details)

Subsequent Events (Details) $ in Thousands	Apr. 30, 2019USD ($)
Scenario, Forecast [Member]
Subsequent Event [Line Items]
Limited partnership, capital contribution	$ 4,180