Hills Bancorporation (HBIA) 10-K 6 Mar 20 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 29, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	0-12668
Entity Registrant Name	Hills Bancorporation
Entity Incorporation, State or Country Code	IA
Entity Tax Identification Number	42-1208067
Entity Address, Address Line One	131 E. Main Street, PO Box 160
Entity Address, City or Town	Hills
Entity Address, State or Province	IA
Entity Address, Postal Zip Code	52235
City Area Code	319
Local Phone Number	679-2291
Title of 12(g) Security	No par value common stock
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Smaller Reporting Company	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 490,609,255
Entity Common Stock, Shares Outstanding (in shares)		9,435,369
Documents Incorporated by Reference	Portions of the Proxy Statement dated March 20, 2020 for the Annual Meeting of the Shareholders of the Registrant to be held April 20, 2020 (the Proxy Statement) are incorporated by reference in Part III of this Form 10-K.
Entity Central Index Key	0000732417
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 241,965	$ 43,305
Investment securities available for sale at fair value (amortized cost 2019 $351,069; 2018 $321,660) (Notes 1, 2 and 13)	355,303	318,926
Stock of Federal Home Loan Bank	11,065	12,172
Loans held for sale	8,400	1,984
Loans, net of allowance for loan losses (2019 $33,760; 2018 $37,810) (Notes 1, 3, and 12)	2,606,277	2,591,085
Property and equipment, net (Note 4)	37,146	37,051
Tax credit real estate	8,280	9,193
Accrued interest receivable	12,442	11,784
Deferred income taxes, net (Note 10)	8,018	10,869
Goodwill	2,500	2,500
Other assets	9,491	3,595
Total Assets	3,300,887	3,042,464
Liabilities
Noninterest-bearing deposits	387,612	372,152
Interest-bearing deposits (Note 6)	2,273,752	2,048,972
Total deposits	2,661,364	2,421,124
Federal Home Loan Bank borrowings (Note 7)	185,000	215,000
Accrued interest payable	2,474	1,812
Other liabilities	25,012	20,776
Total Liabilities	2,873,850	2,658,712
Commitments and Contingencies (Notes 9 and 15)
Ownership Plan (ESOP) (Note 9)	51,826	48,870
Stockholders' Equity (Note 11)
Common stock, no par value; authorized 20,000,000 shares; issued 2019 10,327,656 shares; 2018 10,325,191 shares	0	0
Paid in capital	55,943	52,122
Retained earnings	409,509	371,848
Accumulated other comprehensive gain (loss) (Note 8)	1,415	(3,250)
Treasury stock at cost (2019 975,962 shares; 2018 988,750 shares)	(39,830)	(36,968)
Total Stockholders' Equity	427,037	383,752
Less maximum cash obligation related to ESOP shares (Note 9)	51,826	48,870
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	375,211	334,882
Total Liabilities & Stockholders' Equity	$ 3,300,887	$ 3,042,464

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Investment securities available for sale, amortized cost	$ 351,069	$ 321,660
Loans, allowance for loan losses	$ 33,760	$ 37,810
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)	10,327,656	10,325,191
Treasury stock at cost (in shares)	975,962	988,750

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Loans, including fees	$ 121,269	$ 110,588	$ 100,579
Investment securities:
Taxable	3,239	2,759	1,709
Nontaxable	3,844	3,511	3,231
Federal funds sold	3,980	1,939	433
Total interest income	132,332	118,797	105,952
Interest expense:
Deposits	28,540	19,531	9,742
Other borrowings	0	0	184
FHLB borrowings	6,333	6,792	8,046
Total interest expense	34,873	26,323	17,972
Net interest income	97,459	92,474	87,980
Provision for loan losses (Note 3)	(2,880)	8,497	1,688
Net interest income after provision for loan losses	100,339	83,977	86,292
Noninterest income:
Net gain on sale of loans	3,539	1,517	1,547
Other noninterest income	1,426	2,680	2,378
Loss on sale of investment securities	(28)	0	0
Total other income	24,792	23,818	20,818
Noninterest expenses:
Salaries and employee benefits	36,709	34,981	33,197
Occupancy	4,336	4,374	4,189
Furniture and equipment	6,795	5,741	5,580
Office supplies and postage	1,841	1,778	1,961
Advertising and business development	2,595	2,513	2,764
Outside services	10,360	10,076	8,303
FDIC insurance assessment	194	856	845
Other noninterest expenses	4,434	1,804	2,673
Total other expenses	67,264	62,123	59,512
Income before income taxes	57,867	45,672	47,598
Income taxes (Note 10)	12,549	8,905	19,537
Net income	$ 45,318	$ 36,767	$ 28,061
Earnings per share:
Basic (in dollars per share)	$ 4.85	$ 3.93	$ 3.01
Diluted (in dollars per share)	$ 4.85	$ 3.92	$ 3.01
Trust fees
Noninterest income:
Fee income	$ 9,579	$ 10,007	$ 8,043
Service charges and fees
Noninterest income:
Fee income	$ 10,276	$ 9,614	$ 8,850

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 45,318	$ 36,767	$ 28,061
Securities:
Net change in unrealized gain (loss) on securities available for sale	6,940	(1,593)	361
Reclassification adjustment for net losses realized in net income	28	0	0
Income taxes	(1,738)	397	(139)
Other comprehensive income (loss) on securities available for sale	5,230	(1,196)	222
Derivatives used in cash flow hedging relationships:
Net change in unrealized (loss) gain on derivatives	(753)	1,223	1,119
Income taxes	188	(305)	(428)
Other comprehensive (loss) income on cash flow hedges	(565)	918	691
Other comprehensive income (loss), net of tax	4,665	(278)	913
Comprehensive income	$ 49,983	$ 36,489	$ 28,974

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, 2016	$ 289,270	$ 44,606	$ 319,982	$ (3,359)	$ (31,178)	$ (40,781)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 114,935, 113,373 and 101,912 shares of common stock for the years ending 2017, 2018, and 2019, respectively	5,446	4,851	0	0	595	0
Issuance of 6,892, 8,172 and 7,720 shares of common stock under the employee stock purchase plan for the years ending 2017, 2018, and 2019, respectively	325	325	0	0	0	0
Unearned restricted stock compensation	(707)	(707)	0	0	0	0
Forfeiture of 3,934, 3,296 and 5,255 shares of common stock for the years ending 2017, 2018, and 2019, 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 ($0.70, $0.75, and $0.82 per share) for the years ending 2017, 2018, and 2019, respectively	(6,485)	0	(6,485)	0	0	0
Purchase of 46,966, 116,962 and 89,124 shares of common stock for the years ending 2017, 2018, and 2019, respectively	(2,435)	0	0	0	(2,435)	0
Other comprehensive income (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 114,935, 113,373 and 101,912 shares of common stock for the years ending 2017, 2018, and 2019, respectively	6,220	3,386	0	0	2,834	0
Issuance of 6,892, 8,172 and 7,720 shares of common stock under the employee stock purchase plan for the years ending 2017, 2018, and 2019, respectively	421	421	0	0	0	0
Unearned restricted stock compensation	(463)	(463)	0	0	0	0
Forfeiture of 3,934, 3,296 and 5,255 shares of common stock for the years ending 2017, 2018, and 2019, 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 ($0.70, $0.75, and $0.82 per share) for the years ending 2017, 2018, and 2019, 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 46,966, 116,962 and 89,124 shares of common stock for the years ending 2017, 2018, and 2019, respectively	(6,784)	0	0	0	(6,784)	0
Other comprehensive income (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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 114,935, 113,373 and 101,912 shares of common stock for the years ending 2017, 2018, and 2019, respectively	6,221	3,549	0	0	2,672	0
Issuance of 6,892, 8,172 and 7,720 shares of common stock under the employee stock purchase plan for the years ending 2017, 2018, and 2019, respectively	434	434	0	0	0	0
Unearned restricted stock compensation	86	86	0	0	0	0
Forfeiture of 3,934, 3,296 and 5,255 shares of common stock for the years ending 2017, 2018, and 2019, respectively	(262)	(262)	0	0	0	0
Share-based compensation	14	14	0	0	0	0
Change related to ESOP shares	(2,956)	0	0	0	0	(2,956)
Net income	45,318	0	45,318	0	0	0
Cash dividends ($0.70, $0.75, and $0.82 per share) for the years ending 2017, 2018, and 2019, respectively	(7,657)	0	(7,657)	0	0	0
Purchase of 46,966, 116,962 and 89,124 shares of common stock for the years ending 2017, 2018, and 2019, respectively	(5,534)	0	0	0	(5,534)	0
Other comprehensive income (loss)	4,665	0	0	4,665	0	0
Ending Balance at Dec. 31, 2019	$ 375,211	$ 55,943	$ 409,509	$ 1,415	$ (39,830)	$ (51,826)

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)	101,912	113,373	114,935
Issuance of common stock purchased under the Employee Stock Purchase Plan (in shares)	7,720	8,172	6,892
Forfeiture of common stock (in shares)	5,255	3,296	3,934
Cash dividends (in dollars per share)	$ 0.82	$ 0.750	$ 0.700
Purchase of common stock (in shares)	89,124	116,962	46,966

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 45,318	$ 36,767	$ 28,061
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation	3,072	3,012	2,856
Provision for loan losses	(2,880)	8,497	1,688
Net loss on sale of investment securities available for sale	28	0	0
Share-based compensation	14	0	11
Compensation expensed through issuance of common stock	1,133	1,466	1,446
Forfeiture of common stock	(262)	(152)	(156)
Provision for deferred income taxes	1,301	(1,971)	3,238
Net gain on sale of other real estate owned and other repossessed assets	(94)	(18)	(60)
Increase in accrued interest receivable	(658)	(1,012)	(1,651)
Amortization of premium on investment securities, net	441	480	586
(Increase) decrease in other assets	(2,681)	(1,086)	972
Amortization of operating lease right of use assets	354
Increase (decrease) in accrued interest and other liabilities	650	(1,423)	4,263
Loans originated for sale	(299,223)	(136,746)	(150,264)
Proceeds on sales of loans	296,346	141,441	156,455
Net gain on sales of loans	(3,539)	(1,517)	(1,547)
Net cash and cash equivalents provided by operating activities	39,320	47,738	45,898
Cash Flows from Investing Activities
Proceeds from maturities of investment securities available for sale	63,301	57,284	65,339
Proceeds from sale of investment securities available for sale	12,467	0	0
Purchases of investment securities available for sale	(104,539)	(90,295)	(85,772)
Loans made to customers, net of collections	(13,024)	(168,567)	(181,631)
Proceeds on sale of other real estate owned and other repossessed assets	818	168	520
Purchases of property and equipment	(3,167)	(2,206)	(2,854)
Net changes from tax credit real estate investment	913	883	487
Net cash and cash equivalents used in investing activities	(43,231)	(202,733)	(203,911)
Cash Flows from Financing Activities
Net increase in deposits	240,240	132,559	252,253
Net decrease in short-term borrowings	0	0	(33,489)
Net (decrease) increase in FHLB borrowings	(30,000)	(80,000)	60,000
Borrowings from FRB	1	1	820
Payments on FRB borrowings	(1)	(1)	(820)
Issuance of common stock, net of costs	5,026	4,713	3,762
Stock options exercised	62	41	238
Purchase of treasury stock	(5,534)	(6,784)	(2,435)
Proceeds from the issuance of common stock through the employee stock purchase plan	434	421	325
Dividends paid	(7,657)	(7,003)	(6,485)
Net cash and cash equivalents used by financing activities	202,571	43,947	274,169
Increase (decrease) in cash and cash equivalents	198,660	(111,048)	116,156
Cash and cash equivalents:
Beginning of year	43,305	154,353	38,197
End of year	241,965	43,305	154,353
Cash payments for:
Interest paid to depositors	27,878	19,009	9,436
Interest paid on other obligations	6,333	6,792	8,230
Income taxes paid	10,784	9,924	14,488
Noncash financing activities:
Increase in maximum cash obligation related to ESOP shares	2,956	5,562	2,527
Transfers to other real estate owned	712	150	223
Sale and financing of other real estate owned	97	$ 96	$ 433
Right-of-use assets obtained in exchange for operating lease obligations	$ 3,581

Nature of Activities and Signif

Nature of Activities and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
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, 2019 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, 2019 and 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. The Company did not capitalize any contract acquisition costs for the years ending December 31, 2019 and 2018. Cash and cash equivalents : The Company considers all investments with original maturities of three months or less to be cash equivalents. At December 31, 2019 and 2018 , 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, 2019 or 2018 . 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, 2019 , 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, 2019 . 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 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 provides construction financing for the project and will contribute capital of $4.18 million upon construction completion which is anticipated to be in April 2020. In 2016, the Company adopted ASU 2015-02 and the investments in tax credit real estate are recorded for all years presented 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, 2019 , 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. 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 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. 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, 2019 2018 2017 (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 9,336,441 9,335,154 9,264,227 Weighted average number of net shares issued (redeemed) 19,304 31,160 65,776 Weighted average shares outstanding (basic) 9,355,745 9,366,314 9,330,003 Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method 4,035 4,027 4,632 Weighted average number of shares (diluted) 9,359,780 9,370,341 9,334,635 Net income $ 45,318 $ 36,767 $ 28,061 Earnings per share: Basic $ 4.85 $ 3.93 $ 3.01 Diluted $ 4.85 $ 3.92 $ 3.01 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 13 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. The Company has implemented a software solution provided by a third party vendor to assist in the determination of the CECL model. The CECL model is being finalized and we completed the validation process for the CECL model using an independent outside party in January 2020. Our current planned approach for estimating expected life-time credit losses for loans upon adoption includes the following key components: • An initial forecast period of one year for all portfolio segments and off-balance-sheet credit exposures. This period reflects management’s expectation of losses based on forward-looking economic scenarios over that time. • A historical loss forecast period covering the remaining contractual life, adjusted for prepayments, by portfolio segment based on the change in key historical economic variables. • A reversion period of up to 3 years connecting the initial loss forecast to the historical loss forecast based on economic conditions at the measurement date. • We will primarily utilize discounted cash flow (DCF) methods to estimate credit losses by portfolio segment. The DCF methods obtain estimated life-time credit losses using the conceptual components described above. Based on our portfolio composition upon adoption and the current economic environment, we anticipate an increase in our Allowance for Credit Losses (ACL) for loans of approximately $3 million to $4 million . We also anticipate an unfunded commitments liability of approximately $1 million to $2 million . We will continue to evaluate and refine the results of our loss estimates throughout the first quarter of 2020. The future effects of CECL on our ACL will depend on the size and composition of our portfolio, the portfolio’s credit quality and economic conditions, as well as any refinements to our model, methodology and other key assumptions. We will recognize a one-time cumulative-effect adjustment to our ACL upon adoption of the new standard. The increase in the ACL will result in a decrease to our regulatory capital amounts and ratios. 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

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The carrying values of investment securities at December 31, 2019 and December 31, 2018 are summarized in the following table (Amounts in Thousands): December 31, 2019 December 31, 2018 Amount Percent Amount Percent Securities available for sale U.S. Treasury $ 128,585 36.19 % $ 83,155 26.07 % Other securities (FHLB, FHLMC and FNMA) 15,229 4.29 % 34,871 10.93 % State and political subdivisions 211,489 59.52 % 200,900 63.00 % Total securities available for sale $ 355,303 100.00 % $ 318,926 100.00 % 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, 2019 or 2018 . 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, 2019: U.S. Treasury $ 127,096 $ 1,626 $ (137 ) $ 128,585 Other securities (FHLB, FHLMC and FNMA) 15,287 — (58 ) 15,229 State and political subdivisions 208,686 2,938 (135 ) 211,489 Total $ 351,069 $ 4,564 $ (330 ) $ 355,303 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 The amortized cost and estimated fair value of available-for-sale securities classified according to their contractual maturities at December 31, 2019 , were as follows (Amounts in Thousands): Amortized Cost Fair Value Due in one year or less $ 63,191 $ 63,189 Due after one year through five years 196,456 198,559 Due after five years through ten years 81,854 84,025 Due over ten years 9,568 9,530 Total $ 351,069 $ 355,303 As of December 31, 2019 , investment securities with a carrying value of $12.93 million were pledged to collateralize derivative financial instruments and other borrowings. Sales proceeds and gross realized gains and losses on available-for-sale securities were as follows (in thousands): December 31, 2019 December 31, 2018 Sales proceeds $ 12,467 $ — Gross realized gains 24 — Gross realized losses 52 — 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, 2019 and 2018 (Amounts in Thousands): Less than 12 months 12 months or more Total 2019 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 11 $ 27,932 $ (136 ) 0.49 % 1 $ 2,495 $ (1 ) 0.04 % 12 $ 30,427 $ (137 ) 0.45 % Other securities (FHLB, FHLMC and FNMA) — — — — % 6 15,229 (58 ) 0.38 % 6 15,229 (58 ) 0.38 % State and political subdivisions 66 17,881 (119 ) 0.67 % 20 3,825 (16 ) 0.42 % 86 21,706 (135 ) 0.62 % Total temporarily impaired securities 77 $ 45,813 $ (255 ) 0.56 % 27 $ 21,549 $ (75 ) 0.35 % 104 $ 67,362 $ (330 ) 0.49 % 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 % 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, 2019
Receivables [Abstract]
Loans	Loans Classes of loans are as follows: December 31, 2019 2018 (Amounts In Thousands) Agricultural $ 91,317 $ 92,673 Commercial and financial 221,323 229,501 Real estate: Construction, 1 to 4 family residential 80,209 72,279 Construction, land development and commercial 108,410 113,807 Mortgage, farmland 242,730 236,454 Mortgage, 1 to 4 family first liens 910,742 912,059 Mortgage, 1 to 4 family junior liens 149,227 152,625 Mortgage, multi-family 350,761 352,434 Mortgage, commercial 402,181 383,314 Loans to individuals 32,308 30,072 Obligations of state and political subdivisions 49,896 52,725 2,639,104 2,627,943 Net unamortized fees and costs 933 952 2,640,037 2,628,895 Less allowance for loan losses 33,760 37,810 $ 2,606,277 $ 2,591,085 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, 2019 , 2018 and 2017 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) 2019 Allowance for loan losses: Beginning balance $ 2,789 $ 5,826 $ 3,292 $ 3,972 $ 12,516 $ 8,165 $ 1,250 $ 37,810 Charge-offs (266 ) (981 ) (45 ) (6 ) (896 ) (341 ) (434 ) (2,969 ) Recoveries 95 646 8 5 700 180 165 1,799 Provision (218 ) (503 ) (656 ) (21 ) (1,682 ) (145 ) 345 (2,880 ) Ending balance $ 2,400 $ 4,988 $ 2,599 $ 3,950 $ 10,638 $ 7,859 $ 1,326 $ 33,760 Ending balance, individually evaluated for impairment $ 87 $ 792 $ — $ — $ 111 $ 1 $ 93 $ 1,084 Ending balance, collectively evaluated for impairment $ 2,313 $ 4,196 $ 2,599 $ 3,950 $ 10,527 $ 7,858 $ 1,233 $ 32,676 Loan balances: Ending balance $ 91,317 $ 221,323 $ 188,619 $ 242,730 $ 1,059,969 $ 752,942 $ 82,204 $ 2,639,104 Ending balance, individually evaluated for impairment $ 1,730 $ 2,742 $ 421 $ 4,081 $ 8,670 $ 3,188 $ 93 $ 20,925 Ending balance, collectively evaluated for impairment $ 89,587 $ 218,581 $ 188,198 $ 238,649 $ 1,051,299 $ 749,754 $ 82,111 $ 2,618,179 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 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, 2019 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2019 Grade: Excellent $ 3,594 $ 3,461 $ 260 $ 190 Good 12,380 47,843 8,868 23,217 Satisfactory 43,308 117,114 51,093 47,987 Monitor 24,857 44,543 17,505 29,009 Special Mention 3,110 5,157 2,483 7,428 Substandard 4,068 3,205 — 579 Total $ 91,317 $ 221,323 $ 80,209 $ 108,410 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 2019 Grade: Excellent $ 3,630 $ 3,209 $ 261 $ 18,955 Good 40,118 32,474 4,233 47,871 Satisfactory 134,738 751,215 136,079 189,391 Monitor 53,147 96,353 5,473 60,965 Special Mention 3,033 11,167 1,469 27,559 Substandard 8,064 16,324 1,712 6,020 Total $ 242,730 $ 910,742 $ 149,227 $ 350,761 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2019 Grade: Excellent $ 27,017 $ — $ 7,444 $ 68,021 Good 79,467 221 14,465 311,157 Satisfactory 206,196 31,385 20,274 1,728,780 Monitor 81,381 437 7,323 420,993 Special Mention 4,802 212 390 66,810 Substandard 3,318 53 — 43,343 Total $ 402,181 $ 32,308 $ 49,896 $ 2,639,104 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 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, 2019 and 2018 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, 2019 Agricultural $ 163 $ 275 $ 122 $ 560 $ 90,757 $ 91,317 $ 48 Commercial and financial 1,076 229 101 1,406 219,917 221,323 65 Real estate: Construction, 1 to 4 family residential 635 — — 635 79,574 80,209 — Construction, land development and commercial 215 101 — 316 108,094 108,410 — Mortgage, farmland 736 — 610 1,346 241,384 242,730 — Mortgage, 1 to 4 family first liens 5,026 3,100 4,149 12,275 898,467 910,742 354 Mortgage, 1 to 4 family junior liens 813 126 233 1,172 148,055 149,227 139 Mortgage, multi-family — 97 — 97 350,664 350,761 — Mortgage, commercial 321 489 — 810 401,371 402,181 — Loans to individuals 226 55 15 296 32,012 32,308 — Obligations of state and political subdivisions — — — — 49,896 49,896 — $ 9,211 $ 4,472 $ 5,230 $ 18,913 $ 2,620,191 $ 2,639,104 $ 606 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 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 increased $0.24 million from December 31, 2018 to December 31, 2019 . As of December 31, 2019 and 2018 , accruing loans past due 90 days or more were 0.02% and 0.01% of total loans, respectively. The average balance of the accruing loans past due 90 days or more decreased in 2019 as compared to 2018 . The average 90 days or more past due accruing loan balance per loan was $0.08 million as of December 31, 2019 compared to $0.19 million as of December 31, 2018 . 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, 2019 and 2018 was as follows: December 31, 2019 December 31, 2018 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 $ 1,192 $ 48 $ 404 $ 1,338 $ — $ 120 Commercial and financial 679 65 1,934 1,476 — 2,686 Real estate: Construction, 1 to 4 family residential — — — — 212 — Construction, land development and commercial — — 320 — — 328 Mortgage, farmland 1,369 — 2,712 1,062 — 3,301 Mortgage, 1 to 4 family first liens 6,558 354 1,626 5,799 158 1,143 Mortgage, 1 to 4 family junior liens 94 139 — — — 24 Mortgage, multi-family 97 — 1,719 145 — — Mortgage, commercial 779 — 593 1,009 — 937 Loans to individuals — — — — — — $ 10,768 $ 606 $ 9,308 $ 10,829 $ 370 $ 8,539 (1) There were $4.34 million and $4.84 million of TDR loans included within nonaccrual loans as of December 31, 2019 and 2018 , 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, 2019 and 2018 : December 31, 2019 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 9 $ 1,552 $ 3 Commercial and financial 16 2,641 95 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 2 320 — Mortgage, farmland 8 4,021 — Mortgage, 1 to 4 family first liens 16 2,083 — Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family 2 1,719 — Mortgage, commercial 7 1,373 — Loans to individuals — — — 60 $ 13,709 $ 98 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 A summary of TDR loans that were modified during the year ended December 31, 2019 and 2018 was as follows: December 31, 2019 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 4 $ 574 $ 574 Commercial and financial 5 503 503 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial — — — Mortgage, farmland 1 620 620 Mortgage, 1 to 4 family first liens 3 705 705 Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family 2 1,719 1,719 Mortgage, commercial — — — Loans to individuals — — — 15 $ 4,121 $ 4,121 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 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 was one TDR loan totaling $0.065 million modified during the year that was in payment default (defined as past due 90 days or more) as of December 31, 2019 and no ne as of December 31, 2018 . Information regarding impaired loans as of and for the year ended December 31, 2019 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2019 With no related allowance recorded: Agricultural $ 1,596 $ 2,157 $ — $ 1,785 $ 37 Commercial and financial 1,340 2,220 — 1,617 64 Real estate: Construction, 1 to 4 family residential 101 144 — 106 — Construction, land development and commercial 320 336 — 324 18 Mortgage, farmland 4,081 4,613 — 4,144 157 Mortgage, 1 to 4 family first liens 7,157 9,015 — 6,822 51 Mortgage, 1 to 4 family junior liens — 246 — — — Mortgage, multi-family 1,816 1,930 — 1,873 83 Mortgage, commercial 1,302 1,852 — 1,364 26 Loans to individuals — 14 — — — $ 17,713 $ 22,527 $ — $ 18,035 $ 436 With an allowance recorded: Agricultural $ 134 $ 134 $ 87 $ 287 $ 17 Commercial and financial 1,402 1,539 792 1,510 83 Real estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — — — — Mortgage, farmland — — — — — Mortgage, 1 to 4 family first liens 1,280 1,501 64 1,318 29 Mortgage, 1 to 4 family junior liens 233 233 47 239 6 Mortgage, multi-family — — — — — Mortgage, commercial 70 70 1 73 4 Loans to individuals 93 93 93 62 2 $ 3,212 $ 3,570 $ 1,084 $ 3,489 $ 141 Total: Agricultural $ 1,730 $ 2,291 $ 87 $ 2,072 $ 54 Commercial and financial 2,742 3,759 792 3,127 147 Real estate: Construction, 1 to 4 family residential 101 144 — 106 — Construction, land development and commercial 320 336 — 324 18 Mortgage, farmland 4,081 4,613 — 4,144 157 Mortgage, 1 to 4 family first liens 8,437 10,516 64 8,140 80 Mortgage, 1 to 4 family junior liens 233 479 47 239 6 Mortgage, multi-family 1,816 1,930 — 1,873 83 Mortgage, commercial 1,372 1,922 1 1,437 30 Loans to individuals 93 107 93 62 2 $ 20,925 $ 26,097 $ 1,084 $ 21,524 $ 577 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 Impaired loans decreased by $7.06 million from December 31, 2018 to December 31, 2019 . 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 0.79% and 1.06% of loans held for investment as of December 31, 2019 and 2018, respectively. The decrease in impaired loans is due mainly to a decrease of $8.07 million in specific reserve loans and a decrease in nonaccrual loans of $0.06 million and offset by an increase of accruing loans past due 90 days or more of $0.24 million , and an increase in TDR loans of $0.77 million from December 31, 2018 to December 31, 2019 . 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, 2019 and 2018 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, 2019
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, 2019 2018 (Amounts In Thousands) Land $ 11,261 $ 10,899 Buildings and improvements 37,261 36,815 Furniture and equipment 38,449 36,090 86,971 83,804 Less accumulated depreciation 49,825 46,753 Net $ 37,146 $ 37,051

Leases

Leases	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Leases	Leases The Bank leases branch offices, parking facilities and certain equipment under operating leases. The leases have remaining lease terms of 1 year to 16 years , some of which include options to extend the leases for up to 10 years , and some of which include options to terminate the leases within 1 year . As the options are reasonably certain to be exercised, they are recognized as part of the right-of-use assets and lease liabilities. For the year ended December 31, 2019, total operating lease expense was $0.62 million included in occupancy expenses in the consolidated statement of income. Included in this were $0.53 million of operating lease costs, $0.03 million of short term lease costs, and $0.06 million of variable lease costs. For the year ended December 31, 2019, cash paid for amounts included in the measurement of operating lease liabilities was $0.53 million and right-of-use assets obtained in exchange for lease obligations was $3.58 million . As of December 31, 2019, operating lease right-of-use assets included in other assets was $3.20 million and liabilities was $3.23 million . The weighted average remaining lease term for operating leases was 10.86 years and the weighted average discount rate for operating leases was 3.46% . Discount rates used were determined from FHLB borrowing rates for comparable terms. As of December 31, 2019, maturities of lease liabilities were as follows: Year ending December 31: (Amounts In Thousands) 2020 470 2021 456 2022 447 2023 301 2024 250 Thereafter 2,009 Total lease payments 3,933 Less imputed interest (706 ) Total operating lease liabilities $ 3,227

Interest-Bearing Deposits

Interest-Bearing Deposits	12 Months Ended
	Dec. 31, 2019
Interest-bearing Deposit Liabilities [Abstract]
Interest-Bearing Deposits	Interest - Bearing Deposits A summary of these deposits is as follows: December 31, 2019 2018 (Amounts In Thousands) NOW and other demand $ 610,271 $ 542,388 Savings 981,827 925,214 Time, $100,000 and over 292,982 228,551 Other time 388,672 352,819 $ 2,273,752 $ 2,048,972 Brokered deposits totaled $109.29 million and $132.46 million as of December 31, 2019 and 2018 , respectively, with an average interest rate of 1.65% and 2.46% as of December 31, 2019 and 2018 , respectively. As of December 31, 2019 , brokered deposits of $109.29 million are included in savings deposits. At December 31, 2018 , brokered deposits of $132.46 million were included in savings deposits. Time deposits have a maturity as follows: December 31, 2019 2018 (Amounts In Thousands) Due in one year or less $ 324,554 $ 229,091 Due after one year through two years 124,527 223,254 Due after two years through three years 90,009 44,610 Due after three years through four years 130,252 35,002 Due over four years 12,312 49,413 $ 681,654 $ 581,370

Federal Home Loan Bank Borrowin

Federal Home Loan Bank Borrowings	12 Months Ended
	Dec. 31, 2019
Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Borrowings	Federal Home Loan Bank Borrowings As of December 31, 2019 and 2018 , the borrowings were as follows: 2019 2018 (Effective interest rates as of December 31, 2019) (Amounts In Thousands) Due 2020, 3.05% 25,000 25,000 Due 2023, 3.77% 25,000 25,000 Due 2024, 2.38% 15,000 15,000 Due 2025, 2.54% to 2.94% 60,000 90,000 Due 2026, 2.52% to 2.86% 30,000 30,000 Due 2027, 2.76% to 2.95% 30,000 30,000 $ 185,000 $ 215,000 On December 13, 2019 the Company paid $30.00 million in FHLB Borrowings due in 2025. 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. Fees incurred with the 2019 prepayments were $2.09 million . 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 $11.06 million and $12.17 million at December 31, 2019 and 2018 , respectively. Collateral is provided by the Company’s 1 to 4 family mortgage loans totaling $249.75 million at December 31, 2019 and $290.25 million at December 31, 2018 . The Company also has the ability to borrow against agricultural real estate, commercial real estate and multi-family loans totaling $306.86 million as of December 31, 2019 and $296.53 million as of December 31, 2018 and there was $0 borrowed against this collateral as of December 31, 2019 or 2018 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 (amounts in thousands) Net unrealized gain (loss) on available-for-sale securities $ 4,234 $ (2,734 ) Net unrealized loss on derivatives used for cash flow hedges (2,349 ) (1,596 ) Tax effect (470 ) 1,080 Net-of-tax amount $ 1,415 $ (3,250 )

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2019
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, 2019 , 7,720 shares of stock were purchased by employees of the Bank through the ESPP. 8,172 shares of stock were purchased by employees of the Bank through the ESPP for the year ended December 31, 2018 . 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 $1.08 million , $1.05 million and $1.01 million for the years ended December 31, 2019 , 2018 and 2017 , respectively. The 2019 , 2018 and 2017 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, 2019 and 2018 , the shares held by the ESOP, fair value and maximum cash obligation were as follows: 2019 2018 Shares held by the ESOP 797,317 801,147 Fair value per share $ 65.00 $ 61.00 Maximum cash obligation $ 51,826,000 $ 48,870,000 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 $1.08 million contribution to the profit sharing plan for the year ended December 31, 2019 . The Company made a 4.50% or $1.05 million contribution to the profit sharing plan 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 matching contributions under its 401(k) plan of $0.22 million in 2019 , $0.21 million in 2018 , and $0.20 million in 2017 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 $4.89 million and $5.90 million at December 31, 2019 and 2018 , respectively. Expense related to the deferred compensation plan was $0.42 million for 2019 , $0.85 million for 2018 and $0.81 million for 2017 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 $3.94 million and $3.52 million at December 31, 2019 and 2018 , respectively. Expense related to the directors’ deferred compensation plan was $0.28 million for 2019 , $0.43 million for 2018 and $0.37 million for 2017 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. Significant assumptions at the date of grant on May 14, 2019 include the risk-free interest rate of 2.39% , expected option life of 7.5 years , expected volatility of 33% and expected dividends of 1.23% . There were 5,805 stock options granted in 2019 and no ne in 2018 and 2017. The weighted-average fair value of options granted in 2019 was $21.31 per share. The intrinsic value of options exercised was $0.06 million , $0.03 million and $0.24 million for 2019 , 2018 and 2017 , 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, 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 Granted 5,805 Exercised (1,800 ) Balance, December 31, 2019 13,025 $ 45.92 5.47 $ 248 Other pertinent information related to the options outstanding at December 31, 2019 is as follows: Exercise Price Number Outstanding Remaining Contractual Life Number Exercisable 33.00 7,220 28 months 7,220 62.00 5,805 113 months — 13,025 7,220 As of December 31, 2019 , the outstanding options have a weighted-average exercise price of $45.92 per share and a weighted average remaining contractual term of 5.47 years. There was $0.11 million in unrecognized compensation cost for stock options granted under the plan as of December 31, 2019. The cost is expected to be recognized over a weighted-average period of 4.40 years. As of December 31, 2019 , the vested options totaled 7,220 shares with a weighted-average exercise price of $33.00 per share. As of December 31, 2019 , 19,853 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, 2019 is as follows: Number of Shares Weighted Average Grant Date Fair Value Balance, December 31, 2018 38,125 Granted 23,527 $63.96 Forfeited 5,255 $49.91 Balance, December 31, 2019 19,853 The Company authorized the issuance of 23,527 shares in 2019, 24,899 shares in 2018 , and 27,407 shares in 2017 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, 2019 , 2018 and 2017 was $0.96 million , $0.85 million and $0.58 million , respectively. 7,200 , 15,200 and 15,200 shares of the restricted common stock shares awarded in December 31, 2019 , 2018 and 2017, 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, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes for the years ended December 31, 2019 , 2018 and 2017 are summarized as follows: 2019 2018 2017 (Amounts In Thousands) Current: Federal $ 8,857 $ 7,783 $ 13,770 State 2,391 3,093 2,529 Deferred: Federal 1,068 (1,560 ) 3,426 State 233 (411 ) (188 ) $ 12,549 $ 8,905 $ 19,537 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, 2019 and 2018 were as follows: December 31, 2019 2018 (Amounts In Thousands) Deferred income tax assets: Allowance for loan losses $ 8,423 $ 9,434 Deferred compensation 2,047 2,211 Unrealized losses on interest rate swaps 586 398 Accrued expenses 716 668 State net operating loss 929 795 Unrealized losses on investment securities — 682 Gross deferred tax assets $ 12,701 $ 14,188 Valuation allowance (929 ) (795 ) Deferred tax asset, net of valuation allowance $ 11,772 $ 13,393 Deferred income tax liabilities: Property and equipment 1,955 1,728 Unrealized gains on investment securities 1,056 — Goodwill 407 407 Other 336 389 Gross deferred tax liabilities $ 3,754 $ 2,524 Net deferred tax assets $ 8,018 $ 10,869 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 2020 and 2038 . The Company has recorded a valuation allowance to reduce the deferred tax asset attributable to the net operating loss carry-forwards. At December 31, 2019 and 2018 , the Company believes it is more likely than not that the Iowa net operating loss carry-forwards will not be realized. 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 increased (decreased) by $134,000 and ( $41,000 ) for the years ended December 31, 2019 and 2018 , 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, 2019 , 2018 and 2017 is reflected in the consolidated financial statements as follows: Year Ended December 31, 2019 2018 2017 (Amounts In Thousands) Consolidated statements of income $ 1,301 $ 1,971 $ (3,238 ) Consolidated statements of stockholders' equity 1,550 92 (567 ) $ 2,851 $ 2,063 $ (3,805 ) Income tax expense for the years ended December 31, 2019 , 2018 and 2017 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: 2019 2018 2017 Amount % Of Pretax Income Amount % Of Pretax Income Amount % Of Pretax Income (Amounts In Thousands) Expected tax expense $ 12,152 20.9 % $ 9,591 21.0 % $ 16,659 35.0 % Tax-exempt interest (1,201 ) (2.1 ) (1,122 ) (2.5 ) (1,771 ) (3.7 ) Interest expense limitation 109 0.2 87 0.2 103 0.2 State income taxes, net of federal income tax benefit 2,073 3.5 2,119 4.6 1,522 3.2 Income tax credits (531 ) (0.9 ) (1,292 ) (2.8 ) (1,426 ) (3.0 ) Deferred tax asset revaluation — — — — 4,710 9.9 Other (53 ) 0.1 (478 ) (1.0 ) (260 ) (0.6 ) $ 12,549 21.7 % $ 8,905 19.5 % $ 19,537 41.0 % Federal income tax expense for the years ended December 31, 2019 , 2018 and 2017 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, 2019, 2018, 2017 and 2016 , remain subject to examination by the Internal Revenue Service. For state tax purposes, the tax years ended December 31, 2019, 2018, 2017 and 2016 , remain open for examination. There were no material unrecognized tax benefits at December 31, 2019 and December 31, 2018 . No interest or penalties on these unrecognized tax benefits has been recorded. As of December 31, 2019 , the Company does no t anticipate any significant increase or decrease in unrecognized tax benefits during the twelve month period ending December 31, 2020.

Regulatory Capital Requirements

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions	12 Months Ended
	Dec. 31, 2019
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 capital conservation buffer was 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, 2019 and 2018 , the Company and the Bank met all capital adequacy requirements to which they are subject. As of December 31, 2019 , 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, 2019 and 2018 , 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, 2019: Company: Total risk-based capital $ 454,452 18.15 % 8.00 % 10.00 % Tier 1 risk-based capital 423,122 16.90 6.00 8.00 Tier 1 common equity 423,122 16.90 4.50 6.50 Leverage ratio 423,122 12.77 4.00 5.00 Bank: Total risk-based capital 455,440 18.20 8.00 10.00 Tier 1 risk-based capital 424,127 16.95 6.00 8.00 Tier 1 common equity 424,127 16.95 4.50 6.50 Leverage ratio 424,127 12.81 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, 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 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 $223.92 million as of December 31, 2019 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 $221.18 million and $14.68 million as of December 31, 2019 and 2018 , respectively.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 : Year Ended December 31, 2019 2018 (Amounts In Thousands) Balance, beginning $ 51,216 $ 42,496 Net increase (decrease) due to change in related parties 2,481 188 Advances 17,243 28,194 Collections (15,223 ) (19,662 ) Balance, ending $ 55,717 $ 51,216 Deposits from these related parties totaled $11.16 million and $7.13 million as of December 31, 2019 and 2018 , 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, 2019
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, 2019 are as follows: December 31, 2019 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 $ 241,965 $ 241,965 $ 241,965 $ — $ — Investment securities 366,368 366,368 128,585 237,783 — Loans held for sale 8,400 8,400 — 8,400 — Loans Agricultural 88,917 90,118 — — 90,118 Commercial and financial 216,335 217,640 — — 217,640 Real estate: Construction, 1 to 4 family residential 79,096 79,954 — — 79,954 Construction, land development and commercial 106,924 107,276 — — 107,276 Mortgage, farmland 238,780 239,521 — — 239,521 Mortgage, 1 to 4 family first liens 902,630 896,676 — — 896,676 Mortgage, 1 to 4 family junior liens 147,634 143,261 — — 143,261 Mortgage, multi-family 346,938 349,663 — — 349,663 Mortgage, commercial 398,145 395,838 — — 395,838 Loans to individuals 31,455 32,722 — — 32,722 Obligations of state and political subdivisions 49,423 50,564 — — 50,564 Accrued interest receivable 12,442 12,442 — 12,442 — Total financial instrument assets $ 3,235,452 $ 3,232,408 $ 370,550 $ 258,625 $ 2,603,233 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 387,612 $ 387,612 $ — $ 387,612 $ — Interest-bearing deposits 2,273,752 2,292,332 — 2,292,332 — Federal Home Loan Bank borrowings 185,000 186,091 — 186,091 — Interest rate swaps 2,349 2,349 — 2,349 — Accrued interest payable 2,474 2,474 — 2,474 — Total financial instrument liabilities $ 2,851,187 $ 2,870,858 $ — $ 2,870,858 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 424,165 $ — $ — $ — $ — Letters of credit 8,569 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 432,734 $ — $ — $ — $ — (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, 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 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, 2019 . 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. 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. 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 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). 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 or based on the present value of the estimated future cash flows of interest and principal discounted at the loans effective interest rate or the fair value of the loan if determinable. 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%. These loans are considered Level 3 as the instruments used to determine fair market value require significant management judgment and estimation. 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, 2019 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 $ 128,585 $ — $ — $ 128,585 State and political subdivisions — 211,489 — 211,489 Other securities (FHLB, FHLMC and FNMA) — 15,229 — 15,229 Derivative Financial Instruments Interest rate swaps — (2,349 ) — (2,349 ) Total $ 128,585 $ 224,369 $ — $ 352,954 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 (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, 2019 and 2018 . 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, 2019 and 2018 , 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, 2019 Year Ended December 31, 2019 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 $ — $ — $ 1,272 $ 1,272 $ 36 Commercial and financial — — 1,803 1,803 499 Real Estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — 215 215 8 Mortgage, farmland — — 3,576 3,576 — Mortgage, 1 to 4 family first liens — — 7,986 7,986 370 Mortgage, 1 to 4 family junior liens — — 49 49 — Mortgage, multi-family — — 1,816 1,816 — Mortgage, commercial — — 1,237 1,237 125 Loans to individuals — — — — — Foreclosed assets (5) — — — — — Total $ — $ — $ 17,954 $ 17,954 $ 1,038 (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, 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.

Parent Company Only Financial I

Parent Company Only Financial Information	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 (Amounts In Thousands) ASSETS 2019 2018 Cash and cash equivalents at subsidiary bank $ 5,114 $ 3,742 Investment in subsidiary bank 428,042 385,193 Other assets 1,331 1,231 Total assets $ 434,487 $ 390,166 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities $ 7,450 $ 6,414 Redeemable common stock held by ESOP 51,826 48,870 Stockholders' equity: Capital stock 55,943 52,122 Retained earnings 409,509 371,848 Accumulated other comprehensive gain (loss) 1,415 (3,250 ) Treasury stock at cost (39,830 ) (36,968 ) 427,037 383,752 Less maximum cash obligation related to ESOP shares 51,826 48,870 Total stockholders' equity 375,211 334,882 Total liabilities and stockholders' equity $ 434,487 $ 390,166 CONDENSED STATEMENTS OF INCOME Years Ended December 31, 2019 , 2018 and 2017 (Amounts In Thousands) 2019 2018 2017 Dividends received from subsidiary $ 7,657 $ 11,502 $ 7,485 Other expenses (708 ) (786 ) (741 ) Income before income tax benefit and equity in undistributed income of subsidiary 6,949 10,716 6,744 Income tax benefit 271 273 73 7,220 10,989 6,817 Equity in undistributed income of subsidiary 38,098 25,778 21,244 Net income $ 45,318 $ 36,767 $ 28,061 CONDENSED STATEMENTS OF CASH FLOWS Years Ended December 31, 2019 , 2018 and 2017 (Amounts In Thousands) 2019 2018 2017 Cash flows from operating activities: Net income $ 45,318 $ 36,767 $ 28,061 Adjustments to reconcile net income to cash and cash equivalents provided by operating activities: Equity in undistributed income of subsidiary (38,098 ) (25,778 ) (21,244 ) Share-based compensation 14 — 11 Compensation expensed through issuance of common stock 1,133 1,466 1,446 Forfeiture of common stock (262 ) (152 ) (156 ) (Increase) decrease in other assets (100 ) 162 237 Increase in other liabilities 1,036 574 3,212 Net cash and cash equivalents provided by operating activities 9,041 13,039 11,567 Cash flows from financing activities: Issuance of common stock, net of costs 5,026 4,713 3,762 Stock options exercised 62 41 238 Purchase of treasury stock (5,534 ) (6,784 ) (2,435 ) Proceeds from the issuance of common stock through the employee stock purchase plan 434 421 325 Capital contribution to subsidiary — (4,700 ) (3,500 ) Dividends paid (7,657 ) (7,003 ) (6,485 ) Net cash and cash equivalents used by financing activities (7,669 ) (13,312 ) (8,095 ) Increase (decrease) in cash and cash equivalents 1,372 (273 ) 3,472 Cash and cash equivalents: Beginning of year 3,742 4,015 543 Ending of year $ 5,114 $ 3,742 $ 4,015

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
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 $101.94 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 its subsidiaries are subject to pending and threatened legal actions, some of which seek substantial relief or damages. While the ultimate outcome of such legal proceedings cannot be predicted with certainty, after reviewing pending and threatened litigation with counsel, management believes at this time that the outcome of such litigation will not have a material adverse effect on the Company’s business, financial conditions, or results of operations. On April 10, 2019, Hills Bank was sued in a class action lawsuit in the Iowa District Court for Johnson County. The lawsuit seeks class action status for customers who had paid overdraft fees on debit card transactions that were authorized into a positive account, but settled into a negative account. Plaintiff contends that these overdraft fees breached the terms of Hills Bank’s account documents. Plaintiff seeks compensatory and punitive damages for breach of contract. The Bank disputes the merits of Plaintiff’s claims and filed a motion to dismiss the case, which the Court denied. At this stage of the proceedings, it is not possible for management of the Bank to determine the probability of an adverse outcome or reasonably estimate the amount of any potential loss. 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, 2019 and 2018 is as follows: 2019 2018 (Amounts In Thousands) Firm loan commitments and unused portion of lines of credit: Home equity loans $ 65,203 $ 59,330 Credit cards 57,421 52,802 Commercial, real estate and home construction 94,490 89,171 Commercial lines and real estate purchase loans 207,051 174,637 Outstanding letters of credit 8,569 9,033 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, 2019 and 2018 , 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, 2019 for all non-cancelable leases relating to Bank premises were as follows: Year ending December 31: (Amounts In Thousands) 2020 $ 469 2021 375 2022 319 2023 316 2024 82 Thereafter 1 $ 1,562 Rent expense was $0.40 million , $0.36 million and $0.37 million for the years ended December 31, 2019 , 2018 and 2017 , respectively.

Quarterly Results of Operations

Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts)	12 Months Ended
	Dec. 31, 2019
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 2019 Interest income $ 31,847 $ 33,236 $ 33,969 $ 33,280 $ 132,332 Interest expense 8,074 8,848 9,274 8,677 34,873 Net interest income $ 23,773 $ 24,388 $ 24,695 $ 24,603 $ 97,459 Provision for loan losses (1,246 ) (540 ) 144 (1,238 ) (2,880 ) Other income 5,250 5,851 6,638 7,053 24,792 Other expense 16,049 16,360 16,604 18,251 67,264 Income before income taxes $ 14,220 $ 14,419 $ 14,585 $ 14,643 $ 57,867 Income taxes 3,017 3,199 3,303 3,030 12,549 Net income $ 11,203 $ 11,220 $ 11,282 $ 11,613 $ 45,318 Basic earnings per share $ 1.20 $ 1.20 $ 1.21 $ 1.24 $ 4.85 Diluted earnings per share 1.20 1.20 1.21 1.24 4.85 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

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2019
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 $2.35 million of collateral as of December 31, 2019 . 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, 2019 and 2018 : Notional Amount Fair Value Balance Sheet Category Maturity (Amounts in Thousands) December 31, 2019 Interest rate swap $ 25,000 $ (279 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,070 ) Other Liabilities 11/7/2023 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 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, 2019 and 2018 : 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, 2019 Interest rate swap $ (119 ) Interest Expense $ — Other Income $ — Interest rate swap (446 ) Interest Expense — Other Income — December 31, 2018 Interest rate swap $ 347 Interest Expense $ — Other Income $ — Interest rate swap 571 Interest Expense — Other Income —

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company is currently finalizing the CECL model and upon adoption of ASU 2016-13 (CECL) in the first quarter of 2020 anticipates an increase to the allowance for credit losses for loans of approximately $3 to $4 million and an unfunded commitment liability of approximately $1 to $2 million . See Note 1 for further discussion. Subsequent events have been evaluated through March 6, 2020.

Nature of Activities and Sign_2

Nature of Activities and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
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, 2019 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 : 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, 2019 and 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
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, 2019 and 2018 , 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, 2019 or 2018 . 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, 2019 , 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, 2019 . 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 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 provides construction financing for the project and will contribute capital of $4.18 million upon construction completion which is anticipated to be in April 2020. In 2016, the Company adopted ASU 2015-02 and the investments in tax credit real estate are recorded for all years presented 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%
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.
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 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. 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:
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 13 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. The Company has implemented a software solution provided by a third party vendor to assist in the determination of the CECL model. The CECL model is being finalized and we completed the validation process for the CECL model using an independent outside party in January 2020. Our current planned approach for estimating expected life-time credit losses for loans upon adoption includes the following key components: • An initial forecast period of one year for all portfolio segments and off-balance-sheet credit exposures. This period reflects management’s expectation of losses based on forward-looking economic scenarios over that time. • A historical loss forecast period covering the remaining contractual life, adjusted for prepayments, by portfolio segment based on the change in key historical economic variables. • A reversion period of up to 3 years connecting the initial loss forecast to the historical loss forecast based on economic conditions at the measurement date. • We will primarily utilize discounted cash flow (DCF) methods to estimate credit losses by portfolio segment. The DCF methods obtain estimated life-time credit losses using the conceptual components described above. Based on our portfolio composition upon adoption and the current economic environment, we anticipate an increase in our Allowance for Credit Losses (ACL) for loans of approximately $3 million to $4 million . We also anticipate an unfunded commitments liability of approximately $1 million to $2 million . We will continue to evaluate and refine the results of our loss estimates throughout the first quarter of 2020. The future effects of CECL on our ACL will depend on the size and composition of our portfolio, the portfolio’s credit quality and economic conditions, as well as any refinements to our model, methodology and other key assumptions. We will recognize a one-time cumulative-effect adjustment to our ACL upon adoption of the new standard. The increase in the ACL will result in a decrease to our regulatory capital amounts and ratios. 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 on January 1, 2020 did not have a material impact on the financial statements. 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 Company adopted ASU 2017-12 for the period ending March 31, 2019. There was no material impact on the financial statements. 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. Upon adoption, 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 Company adopted ASU 2018-07 for the period ending March 31, 2019. There was no material impact on the financial statements. 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 on January 1, 2020 did not have a material impact on the financial statements. 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 adoption of ASU 2018-15 by the Company on January 1, 2020 did not have a material impact 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 Company adopted ASU No. 2018-16 for the period ending March 31, 2019 concurrently with ASU 2017-12. There was no material impact on the financial statements. In July 2019, the FASB issued ASU No. 2019-07, Codification Updates to SEC Sections, Amendments to SEC Paragraphs Pursuant to SEC Final Rule Releases No. 33-10532, Disclosure Update and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization, and Miscellaneous Updates . The amendments in this ASU update the Codification to reflect the amendments of various SEC disclosure requirements that the agency determined were redundant, duplicative, overlapping, outdated or superseded. The SEC amended its disclosure rules in 2018 with the aim of providing investors with useful disclosure information and to simplify compliance without significantly altering the mix of the information being provided. This ASU was effective upon release and there was no material impact on the financial statements. In November 2019, the FASB issued ASU No. 2019-08, Compensation - Stock Compensation (Topic 718) and Revenue from Contracts with Customers (Topic 606), Codification Improvements - Share-Based Consideration Payable to a Customer. The amendments in this ASU require that an entity measure and classify share-based payment awards granted to a customer by applying the guidance in Topic 718. The amount recorded as a reduction of the transaction price is required to be measured on the basis of the grant-date fair value of the share-based payment award in accordance with Topic 718. The grant date is the date at which a grantor (supplier) and a grantee (customer) reach a mutual understanding of the key terms and conditions of a share-based payment award. The classification and subsequent measurement of the award are subject to the guidance in Topic 718 unless the share-based payment award is subsequently modified and the grantee is no longer a customer. The Company adopted ASU 2019-08 for the period ending December 31, 2019. There was no material impact on the financial statements. In November 2019, the FASB issued ASU No. 2019-11, Codification Improvements to Topic 326, Financial Instruments - Credit Losses. The amendments in this ASU clarify or address stakeholders' specific issues about certain aspects of the amendments in ASU 2016-13 in the following areas: expected recoveries for purchased financial assets with credit deterioration, transition relief for troubled debt restructurings, disclosures related to accrued interest receivables and financial assets secured by collateral maintenance provisions. For public companies, ASU 2019-11 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019 and will be adopted concurrently with ASU 2016-13. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes. The amendments in this ASU simplify the accounting for income taxes by removing specific exceptions included in Topic 740, introducing other simplifications and making technical corrections. For public business entities, the amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption is permitted. The Company is currently evaluating the impact the adoption of this ASU will have on the financial statements.

Nature of Activities and Sign_3

Nature of Activities and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 2017 (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 9,336,441 9,335,154 9,264,227 Weighted average number of net shares issued (redeemed) 19,304 31,160 65,776 Weighted average shares outstanding (basic) 9,355,745 9,366,314 9,330,003 Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method 4,035 4,027 4,632 Weighted average number of shares (diluted) 9,359,780 9,370,341 9,334,635 Net income $ 45,318 $ 36,767 $ 28,061 Earnings per share: Basic $ 4.85 $ 3.93 $ 3.01 Diluted $ 4.85 $ 3.92 $ 3.01

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Carrying values of investment securities	The carrying values of investment securities at December 31, 2019 and December 31, 2018 are summarized in the following table (Amounts in Thousands): December 31, 2019 December 31, 2018 Amount Percent Amount Percent Securities available for sale U.S. Treasury $ 128,585 36.19 % $ 83,155 26.07 % Other securities (FHLB, FHLMC and FNMA) 15,229 4.29 % 34,871 10.93 % State and political subdivisions 211,489 59.52 % 200,900 63.00 % Total securities available for sale $ 355,303 100.00 % $ 318,926 100.00 %
Carrying amount of available-for-sale securities and approximate fair values	Sales proceeds and gross realized gains and losses on available-for-sale securities were as follows (in thousands): December 31, 2019 December 31, 2018 Sales proceeds $ 12,467 $ — Gross realized gains 24 — Gross realized losses 52 — Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value December 31, 2019: U.S. Treasury $ 127,096 $ 1,626 $ (137 ) $ 128,585 Other securities (FHLB, FHLMC and FNMA) 15,287 — (58 ) 15,229 State and political subdivisions 208,686 2,938 (135 ) 211,489 Total $ 351,069 $ 4,564 $ (330 ) $ 355,303 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
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, 2019 , were as follows (Amounts in Thousands): Amortized Cost Fair Value Due in one year or less $ 63,191 $ 63,189 Due after one year through five years 196,456 198,559 Due after five years through ten years 81,854 84,025 Due over ten years 9,568 9,530 Total $ 351,069 $ 355,303
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, 2019 and 2018 (Amounts in Thousands): Less than 12 months 12 months or more Total 2019 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 11 $ 27,932 $ (136 ) 0.49 % 1 $ 2,495 $ (1 ) 0.04 % 12 $ 30,427 $ (137 ) 0.45 % Other securities (FHLB, FHLMC and FNMA) — — — — % 6 15,229 (58 ) 0.38 % 6 15,229 (58 ) 0.38 % State and political subdivisions 66 17,881 (119 ) 0.67 % 20 3,825 (16 ) 0.42 % 86 21,706 (135 ) 0.62 % Total temporarily impaired securities 77 $ 45,813 $ (255 ) 0.56 % 27 $ 21,549 $ (75 ) 0.35 % 104 $ 67,362 $ (330 ) 0.49 % 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 %

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2019
Receivables [Abstract]
Schedule of classes of loans	Classes of loans are as follows: December 31, 2019 2018 (Amounts In Thousands) Agricultural $ 91,317 $ 92,673 Commercial and financial 221,323 229,501 Real estate: Construction, 1 to 4 family residential 80,209 72,279 Construction, land development and commercial 108,410 113,807 Mortgage, farmland 242,730 236,454 Mortgage, 1 to 4 family first liens 910,742 912,059 Mortgage, 1 to 4 family junior liens 149,227 152,625 Mortgage, multi-family 350,761 352,434 Mortgage, commercial 402,181 383,314 Loans to individuals 32,308 30,072 Obligations of state and political subdivisions 49,896 52,725 2,639,104 2,627,943 Net unamortized fees and costs 933 952 2,640,037 2,628,895 Less allowance for loan losses 33,760 37,810 $ 2,606,277 $ 2,591,085
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, 2019 , 2018 and 2017 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) 2019 Allowance for loan losses: Beginning balance $ 2,789 $ 5,826 $ 3,292 $ 3,972 $ 12,516 $ 8,165 $ 1,250 $ 37,810 Charge-offs (266 ) (981 ) (45 ) (6 ) (896 ) (341 ) (434 ) (2,969 ) Recoveries 95 646 8 5 700 180 165 1,799 Provision (218 ) (503 ) (656 ) (21 ) (1,682 ) (145 ) 345 (2,880 ) Ending balance $ 2,400 $ 4,988 $ 2,599 $ 3,950 $ 10,638 $ 7,859 $ 1,326 $ 33,760 Ending balance, individually evaluated for impairment $ 87 $ 792 $ — $ — $ 111 $ 1 $ 93 $ 1,084 Ending balance, collectively evaluated for impairment $ 2,313 $ 4,196 $ 2,599 $ 3,950 $ 10,527 $ 7,858 $ 1,233 $ 32,676 Loan balances: Ending balance $ 91,317 $ 221,323 $ 188,619 $ 242,730 $ 1,059,969 $ 752,942 $ 82,204 $ 2,639,104 Ending balance, individually evaluated for impairment $ 1,730 $ 2,742 $ 421 $ 4,081 $ 8,670 $ 3,188 $ 93 $ 20,925 Ending balance, collectively evaluated for impairment $ 89,587 $ 218,581 $ 188,198 $ 238,649 $ 1,051,299 $ 749,754 $ 82,111 $ 2,618,179 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
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, 2019 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2019 Grade: Excellent $ 3,594 $ 3,461 $ 260 $ 190 Good 12,380 47,843 8,868 23,217 Satisfactory 43,308 117,114 51,093 47,987 Monitor 24,857 44,543 17,505 29,009 Special Mention 3,110 5,157 2,483 7,428 Substandard 4,068 3,205 — 579 Total $ 91,317 $ 221,323 $ 80,209 $ 108,410 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 2019 Grade: Excellent $ 3,630 $ 3,209 $ 261 $ 18,955 Good 40,118 32,474 4,233 47,871 Satisfactory 134,738 751,215 136,079 189,391 Monitor 53,147 96,353 5,473 60,965 Special Mention 3,033 11,167 1,469 27,559 Substandard 8,064 16,324 1,712 6,020 Total $ 242,730 $ 910,742 $ 149,227 $ 350,761 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2019 Grade: Excellent $ 27,017 $ — $ 7,444 $ 68,021 Good 79,467 221 14,465 311,157 Satisfactory 206,196 31,385 20,274 1,728,780 Monitor 81,381 437 7,323 420,993 Special Mention 4,802 212 390 66,810 Substandard 3,318 53 — 43,343 Total $ 402,181 $ 32,308 $ 49,896 $ 2,639,104 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
Schedule of past due loans	Past due loans as of December 31, 2019 and 2018 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, 2019 Agricultural $ 163 $ 275 $ 122 $ 560 $ 90,757 $ 91,317 $ 48 Commercial and financial 1,076 229 101 1,406 219,917 221,323 65 Real estate: Construction, 1 to 4 family residential 635 — — 635 79,574 80,209 — Construction, land development and commercial 215 101 — 316 108,094 108,410 — Mortgage, farmland 736 — 610 1,346 241,384 242,730 — Mortgage, 1 to 4 family first liens 5,026 3,100 4,149 12,275 898,467 910,742 354 Mortgage, 1 to 4 family junior liens 813 126 233 1,172 148,055 149,227 139 Mortgage, multi-family — 97 — 97 350,664 350,761 — Mortgage, commercial 321 489 — 810 401,371 402,181 — Loans to individuals 226 55 15 296 32,012 32,308 — Obligations of state and political subdivisions — — — — 49,896 49,896 — $ 9,211 $ 4,472 $ 5,230 $ 18,913 $ 2,620,191 $ 2,639,104 $ 606 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
Schedule of impaired loan information	Certain impaired loan information by loan type at December 31, 2019 and 2018 was as follows: December 31, 2019 December 31, 2018 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 $ 1,192 $ 48 $ 404 $ 1,338 $ — $ 120 Commercial and financial 679 65 1,934 1,476 — 2,686 Real estate: Construction, 1 to 4 family residential — — — — 212 — Construction, land development and commercial — — 320 — — 328 Mortgage, farmland 1,369 — 2,712 1,062 — 3,301 Mortgage, 1 to 4 family first liens 6,558 354 1,626 5,799 158 1,143 Mortgage, 1 to 4 family junior liens 94 139 — — — 24 Mortgage, multi-family 97 — 1,719 145 — — Mortgage, commercial 779 — 593 1,009 — 937 Loans to individuals — — — — — — $ 10,768 $ 606 $ 9,308 $ 10,829 $ 370 $ 8,539 (1) There were $4.34 million and $4.84 million of TDR loans included within nonaccrual loans as of December 31, 2019 and 2018 , respectively.
Schedule of information for TDR loans	Below is a summary of information for TDR loans as of December 31, 2019 and 2018 : December 31, 2019 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 9 $ 1,552 $ 3 Commercial and financial 16 2,641 95 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 2 320 — Mortgage, farmland 8 4,021 — Mortgage, 1 to 4 family first liens 16 2,083 — Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family 2 1,719 — Mortgage, commercial 7 1,373 — Loans to individuals — — — 60 $ 13,709 $ 98 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 A summary of TDR loans that were modified during the year ended December 31, 2019 and 2018 was as follows: December 31, 2019 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 4 $ 574 $ 574 Commercial and financial 5 503 503 Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial — — — Mortgage, farmland 1 620 620 Mortgage, 1 to 4 family first liens 3 705 705 Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family 2 1,719 1,719 Mortgage, commercial — — — Loans to individuals — — — 15 $ 4,121 $ 4,121 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
Schedule of impaired loans	Information regarding impaired loans as of and for the year ended December 31, 2019 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2019 With no related allowance recorded: Agricultural $ 1,596 $ 2,157 $ — $ 1,785 $ 37 Commercial and financial 1,340 2,220 — 1,617 64 Real estate: Construction, 1 to 4 family residential 101 144 — 106 — Construction, land development and commercial 320 336 — 324 18 Mortgage, farmland 4,081 4,613 — 4,144 157 Mortgage, 1 to 4 family first liens 7,157 9,015 — 6,822 51 Mortgage, 1 to 4 family junior liens — 246 — — — Mortgage, multi-family 1,816 1,930 — 1,873 83 Mortgage, commercial 1,302 1,852 — 1,364 26 Loans to individuals — 14 — — — $ 17,713 $ 22,527 $ — $ 18,035 $ 436 With an allowance recorded: Agricultural $ 134 $ 134 $ 87 $ 287 $ 17 Commercial and financial 1,402 1,539 792 1,510 83 Real estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — — — — Mortgage, farmland — — — — — Mortgage, 1 to 4 family first liens 1,280 1,501 64 1,318 29 Mortgage, 1 to 4 family junior liens 233 233 47 239 6 Mortgage, multi-family — — — — — Mortgage, commercial 70 70 1 73 4 Loans to individuals 93 93 93 62 2 $ 3,212 $ 3,570 $ 1,084 $ 3,489 $ 141 Total: Agricultural $ 1,730 $ 2,291 $ 87 $ 2,072 $ 54 Commercial and financial 2,742 3,759 792 3,127 147 Real estate: Construction, 1 to 4 family residential 101 144 — 106 — Construction, land development and commercial 320 336 — 324 18 Mortgage, farmland 4,081 4,613 — 4,144 157 Mortgage, 1 to 4 family first liens 8,437 10,516 64 8,140 80 Mortgage, 1 to 4 family junior liens 233 479 47 239 6 Mortgage, multi-family 1,816 1,930 — 1,873 83 Mortgage, commercial 1,372 1,922 1 1,437 30 Loans to individuals 93 107 93 62 2 $ 20,925 $ 26,097 $ 1,084 $ 21,524 $ 577 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

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 (Amounts In Thousands) Land $ 11,261 $ 10,899 Buildings and improvements 37,261 36,815 Furniture and equipment 38,449 36,090 86,971 83,804 Less accumulated depreciation 49,825 46,753 Net $ 37,146 $ 37,051

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Schedule of maturities of lease liabilities	As of December 31, 2019, maturities of lease liabilities were as follows: Year ending December 31: (Amounts In Thousands) 2020 470 2021 456 2022 447 2023 301 2024 250 Thereafter 2,009 Total lease payments 3,933 Less imputed interest (706 ) Total operating lease liabilities $ 3,227

Interest-Bearing Deposits (Tabl

Interest-Bearing Deposits (Tables)	12 Months Ended
	Dec. 31, 2019
Interest-bearing Deposit Liabilities [Abstract]
Deposits	A summary of these deposits is as follows: December 31, 2019 2018 (Amounts In Thousands) NOW and other demand $ 610,271 $ 542,388 Savings 981,827 925,214 Time, $100,000 and over 292,982 228,551 Other time 388,672 352,819 $ 2,273,752 $ 2,048,972
Time Deposits	Time deposits have a maturity as follows: December 31, 2019 2018 (Amounts In Thousands) Due in one year or less $ 324,554 $ 229,091 Due after one year through two years 124,527 223,254 Due after two years through three years 90,009 44,610 Due after three years through four years 130,252 35,002 Due over four years 12,312 49,413 $ 681,654 $ 581,370

Federal Home Loan Bank Borrow_2

Federal Home Loan Bank Borrowings (Tables)	12 Months Ended
	Dec. 31, 2019
Federal Home Loan Banks [Abstract]
Schedule of federal home loan bank borrowings	As of December 31, 2019 and 2018 , the borrowings were as follows: 2019 2018 (Effective interest rates as of December 31, 2019) (Amounts In Thousands) Due 2020, 3.05% 25,000 25,000 Due 2023, 3.77% 25,000 25,000 Due 2024, 2.38% 15,000 15,000 Due 2025, 2.54% to 2.94% 60,000 90,000 Due 2026, 2.52% to 2.86% 30,000 30,000 Due 2027, 2.76% to 2.95% 30,000 30,000 $ 185,000 $ 215,000

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 2018 (amounts in thousands) Net unrealized gain (loss) on available-for-sale securities $ 4,234 $ (2,734 ) Net unrealized loss on derivatives used for cash flow hedges (2,349 ) (1,596 ) Tax effect (470 ) 1,080 Net-of-tax amount $ 1,415 $ (3,250 )

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Schedule of Employee Stock Ownership Plan (ESOP)	As of December 31, 2019 and 2018 , the shares held by the ESOP, fair value and maximum cash obligation were as follows: 2019 2018 Shares held by the ESOP 797,317 801,147 Fair value per share $ 65.00 $ 61.00 Maximum cash obligation $ 51,826,000 $ 48,870,000
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, 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 Granted 5,805 Exercised (1,800 ) Balance, December 31, 2019 13,025 $ 45.92 5.47 $ 248
Schedule of pertinent information related to the options outstanding	Other pertinent information related to the options outstanding at December 31, 2019 is as follows: Exercise Price Number Outstanding Remaining Contractual Life Number Exercisable 33.00 7,220 28 months 7,220 62.00 5,805 113 months — 13,025 7,220
Schedule of Restricted Stock Activity	A summary of the restricted stock option activity for the year ended December 31, 2019 is as follows: Number of Shares Weighted Average Grant Date Fair Value Balance, December 31, 2018 38,125 Granted 23,527 $63.96 Forfeited 5,255 $49.91 Balance, December 31, 2019 19,853

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Components of income tax	Income taxes for the years ended December 31, 2019 , 2018 and 2017 are summarized as follows: 2019 2018 2017 (Amounts In Thousands) Current: Federal $ 8,857 $ 7,783 $ 13,770 State 2,391 3,093 2,529 Deferred: Federal 1,068 (1,560 ) 3,426 State 233 (411 ) (188 ) $ 12,549 $ 8,905 $ 19,537
Schedule of deferred tax assets and liabilities	Deferred tax assets and liabilities at December 31, 2019 and 2018 were as follows: December 31, 2019 2018 (Amounts In Thousands) Deferred income tax assets: Allowance for loan losses $ 8,423 $ 9,434 Deferred compensation 2,047 2,211 Unrealized losses on interest rate swaps 586 398 Accrued expenses 716 668 State net operating loss 929 795 Unrealized losses on investment securities — 682 Gross deferred tax assets $ 12,701 $ 14,188 Valuation allowance (929 ) (795 ) Deferred tax asset, net of valuation allowance $ 11,772 $ 13,393 Deferred income tax liabilities: Property and equipment 1,955 1,728 Unrealized gains on investment securities 1,056 — Goodwill 407 407 Other 336 389 Gross deferred tax liabilities $ 3,754 $ 2,524 Net deferred tax assets $ 8,018 $ 10,869
Summary of change in deferred income tax	The net change in the deferred income taxes for the years ended December 31, 2019 , 2018 and 2017 is reflected in the consolidated financial statements as follows: Year Ended December 31, 2019 2018 2017 (Amounts In Thousands) Consolidated statements of income $ 1,301 $ 1,971 $ (3,238 ) Consolidated statements of stockholders' equity 1,550 92 (567 ) $ 2,851 $ 2,063 $ (3,805 )
Schedule of effective income tax rate reconciliation	Income tax expense for the years ended December 31, 2019 , 2018 and 2017 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: 2019 2018 2017 Amount % Of Pretax Income Amount % Of Pretax Income Amount % Of Pretax Income (Amounts In Thousands) Expected tax expense $ 12,152 20.9 % $ 9,591 21.0 % $ 16,659 35.0 % Tax-exempt interest (1,201 ) (2.1 ) (1,122 ) (2.5 ) (1,771 ) (3.7 ) Interest expense limitation 109 0.2 87 0.2 103 0.2 State income taxes, net of federal income tax benefit 2,073 3.5 2,119 4.6 1,522 3.2 Income tax credits (531 ) (0.9 ) (1,292 ) (2.8 ) (1,426 ) (3.0 ) Deferred tax asset revaluation — — — — 4,710 9.9 Other (53 ) 0.1 (478 ) (1.0 ) (260 ) (0.6 ) $ 12,549 21.7 % $ 8,905 19.5 % $ 19,537 41.0 %

Regulatory Capital Requiremen_2

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 , 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, 2019: Company: Total risk-based capital $ 454,452 18.15 % 8.00 % 10.00 % Tier 1 risk-based capital 423,122 16.90 6.00 8.00 Tier 1 common equity 423,122 16.90 4.50 6.50 Leverage ratio 423,122 12.77 4.00 5.00 Bank: Total risk-based capital 455,440 18.20 8.00 10.00 Tier 1 risk-based capital 424,127 16.95 6.00 8.00 Tier 1 common equity 424,127 16.95 4.50 6.50 Leverage ratio 424,127 12.81 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, 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

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 : Year Ended December 31, 2019 2018 (Amounts In Thousands) Balance, beginning $ 51,216 $ 42,496 Net increase (decrease) due to change in related parties 2,481 188 Advances 17,243 28,194 Collections (15,223 ) (19,662 ) Balance, ending $ 55,717 $ 51,216

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 are as follows: December 31, 2019 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 $ 241,965 $ 241,965 $ 241,965 $ — $ — Investment securities 366,368 366,368 128,585 237,783 — Loans held for sale 8,400 8,400 — 8,400 — Loans Agricultural 88,917 90,118 — — 90,118 Commercial and financial 216,335 217,640 — — 217,640 Real estate: Construction, 1 to 4 family residential 79,096 79,954 — — 79,954 Construction, land development and commercial 106,924 107,276 — — 107,276 Mortgage, farmland 238,780 239,521 — — 239,521 Mortgage, 1 to 4 family first liens 902,630 896,676 — — 896,676 Mortgage, 1 to 4 family junior liens 147,634 143,261 — — 143,261 Mortgage, multi-family 346,938 349,663 — — 349,663 Mortgage, commercial 398,145 395,838 — — 395,838 Loans to individuals 31,455 32,722 — — 32,722 Obligations of state and political subdivisions 49,423 50,564 — — 50,564 Accrued interest receivable 12,442 12,442 — 12,442 — Total financial instrument assets $ 3,235,452 $ 3,232,408 $ 370,550 $ 258,625 $ 2,603,233 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 387,612 $ 387,612 $ — $ 387,612 $ — Interest-bearing deposits 2,273,752 2,292,332 — 2,292,332 — Federal Home Loan Bank borrowings 185,000 186,091 — 186,091 — Interest rate swaps 2,349 2,349 — 2,349 — Accrued interest payable 2,474 2,474 — 2,474 — Total financial instrument liabilities $ 2,851,187 $ 2,870,858 $ — $ 2,870,858 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 424,165 $ — $ — $ — $ — Letters of credit 8,569 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 432,734 $ — $ — $ — $ — (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, 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
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, 2019 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 $ 128,585 $ — $ — $ 128,585 State and political subdivisions — 211,489 — 211,489 Other securities (FHLB, FHLMC and FNMA) — 15,229 — 15,229 Derivative Financial Instruments Interest rate swaps — (2,349 ) — (2,349 ) Total $ 128,585 $ 224,369 $ — $ 352,954 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 (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, 2019 and 2018 , 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, 2019 Year Ended December 31, 2019 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 $ — $ — $ 1,272 $ 1,272 $ 36 Commercial and financial — — 1,803 1,803 499 Real Estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — 215 215 8 Mortgage, farmland — — 3,576 3,576 — Mortgage, 1 to 4 family first liens — — 7,986 7,986 370 Mortgage, 1 to 4 family junior liens — — 49 49 — Mortgage, multi-family — — 1,816 1,816 — Mortgage, commercial — — 1,237 1,237 125 Loans to individuals — — — — — Foreclosed assets (5) — — — — — Total $ — $ — $ 17,954 $ 17,954 $ 1,038 (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, 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.

Parent Company Only Financial_2

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]
CONDENSED BALANCE SHEETS	ASSETS 2019 2018 Cash and cash equivalents at subsidiary bank $ 5,114 $ 3,742 Investment in subsidiary bank 428,042 385,193 Other assets 1,331 1,231 Total assets $ 434,487 $ 390,166 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities $ 7,450 $ 6,414 Redeemable common stock held by ESOP 51,826 48,870 Stockholders' equity: Capital stock 55,943 52,122 Retained earnings 409,509 371,848 Accumulated other comprehensive gain (loss) 1,415 (3,250 ) Treasury stock at cost (39,830 ) (36,968 ) 427,037 383,752 Less maximum cash obligation related to ESOP shares 51,826 48,870 Total stockholders' equity 375,211 334,882 Total liabilities and stockholders' equity $ 434,487 $ 390,166
CONDENSED STATEMENTS OF INCOME	2019 2018 2017 Dividends received from subsidiary $ 7,657 $ 11,502 $ 7,485 Other expenses (708 ) (786 ) (741 ) Income before income tax benefit and equity in undistributed income of subsidiary 6,949 10,716 6,744 Income tax benefit 271 273 73 7,220 10,989 6,817 Equity in undistributed income of subsidiary 38,098 25,778 21,244 Net income $ 45,318 $ 36,767 $ 28,061
CONDENSED STATEMENTS OF CASH FLOWS	2019 2018 2017 Cash flows from operating activities: Net income $ 45,318 $ 36,767 $ 28,061 Adjustments to reconcile net income to cash and cash equivalents provided by operating activities: Equity in undistributed income of subsidiary (38,098 ) (25,778 ) (21,244 ) Share-based compensation 14 — 11 Compensation expensed through issuance of common stock 1,133 1,466 1,446 Forfeiture of common stock (262 ) (152 ) (156 ) (Increase) decrease in other assets (100 ) 162 237 Increase in other liabilities 1,036 574 3,212 Net cash and cash equivalents provided by operating activities 9,041 13,039 11,567 Cash flows from financing activities: Issuance of common stock, net of costs 5,026 4,713 3,762 Stock options exercised 62 41 238 Purchase of treasury stock (5,534 ) (6,784 ) (2,435 ) Proceeds from the issuance of common stock through the employee stock purchase plan 434 421 325 Capital contribution to subsidiary — (4,700 ) (3,500 ) Dividends paid (7,657 ) (7,003 ) (6,485 ) Net cash and cash equivalents used by financing activities (7,669 ) (13,312 ) (8,095 ) Increase (decrease) in cash and cash equivalents 1,372 (273 ) 3,472 Cash and cash equivalents: Beginning of year 3,742 4,015 543 Ending of year $ 5,114 $ 3,742 $ 4,015

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of banks commitments	A summary of the Bank’s commitments at December 31, 2019 and 2018 is as follows: 2019 2018 (Amounts In Thousands) Firm loan commitments and unused portion of lines of credit: Home equity loans $ 65,203 $ 59,330 Credit cards 57,421 52,802 Commercial, real estate and home construction 94,490 89,171 Commercial lines and real estate purchase loans 207,051 174,637 Outstanding letters of credit 8,569 9,033
Non-cancelable leases relating to Bank premises	The minimum future rental commitments as of December 31, 2019 for all non-cancelable leases relating to Bank premises were as follows: Year ending December 31: (Amounts In Thousands) 2020 $ 469 2021 375 2022 319 2023 316 2024 82 Thereafter 1 $ 1,562

Quarterly Results of Operatio_2

Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts) (Tables)	12 Months Ended
	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations	Quarter Ended March June September December Year 2019 Interest income $ 31,847 $ 33,236 $ 33,969 $ 33,280 $ 132,332 Interest expense 8,074 8,848 9,274 8,677 34,873 Net interest income $ 23,773 $ 24,388 $ 24,695 $ 24,603 $ 97,459 Provision for loan losses (1,246 ) (540 ) 144 (1,238 ) (2,880 ) Other income 5,250 5,851 6,638 7,053 24,792 Other expense 16,049 16,360 16,604 18,251 67,264 Income before income taxes $ 14,220 $ 14,419 $ 14,585 $ 14,643 $ 57,867 Income taxes 3,017 3,199 3,303 3,030 12,549 Net income $ 11,203 $ 11,220 $ 11,282 $ 11,613 $ 45,318 Basic earnings per share $ 1.20 $ 1.20 $ 1.21 $ 1.24 $ 4.85 Diluted earnings per share 1.20 1.20 1.21 1.24 4.85 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

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
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, 2019 and 2018 : Notional Amount Fair Value Balance Sheet Category Maturity (Amounts in Thousands) December 31, 2019 Interest rate swap $ 25,000 $ (279 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,070 ) Other Liabilities 11/7/2023 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
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, 2019 and 2018 : 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, 2019 Interest rate swap $ (119 ) Interest Expense $ — Other Income $ — Interest rate swap (446 ) Interest Expense — Other Income — December 31, 2018 Interest rate swap $ 347 Interest Expense $ — Other Income $ — Interest rate swap 571 Interest Expense — Other Income —

Nature of Activities and Sign_4

Nature of Activities and Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019USD ($)	Dec. 31, 2019USD ($)propertysegment	Dec. 31, 2018USD ($)	Apr. 30, 2020USD ($)	Jan. 01, 2020USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
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 | property		2
Number of assisted living rental properties | property		3
Number of multi tenant rental properties for persons with disabilities | property		1
Number of multi family senior living rental properties | property		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
Estimated unfunded commitments liability		$ 33,760	$ 37,810			$ 29,400	$ 26,530
Scenario, Forecast [Member]
Tax credit real estate
Limited partnership, capital contribution				$ 4,180
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
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Subsequent Event [Member] | Minimum [Member] | Accounting Standards Update 2016-13 [Member] | Scenario, Forecast [Member]
Effect of New Financial Accounting Standards
Estimated increase to allowance for credit losses for loans					$ 3,000
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Subsequent Event [Member] | Maximum [Member] | Accounting Standards Update 2016-13 [Member] | Scenario, Forecast [Member]
Effect of New Financial Accounting Standards
Estimated increase to allowance for credit losses for loans					4,000
Unfunded Loan Commitment [Member] | Subsequent Event [Member] | Minimum [Member] | Accounting Standards Update 2016-13 [Member] | Scenario, Forecast [Member]
Effect of New Financial Accounting Standards
Estimated unfunded commitments liability					1,000
Unfunded Loan Commitment [Member] | Subsequent Event [Member] | Maximum [Member] | Accounting Standards Update 2016-13 [Member] | Scenario, Forecast [Member]
Effect of New Financial Accounting Standards
Estimated unfunded commitments liability					$ 2,000

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Computation of weighted average number of basic and diluted shares:
Common shares outstanding at the beginning of the year									9,336,441	9,335,154	9,264,227
Weighted average number of net shares issued (redeemed)									19,304	31,160	65,776
Weighted average shares outstanding (basic)									9,355,745	9,366,314	9,330,003
Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method									4,035	4,027	4,632
Weighted average number of shares (diluted)									9,359,780	9,370,341	9,334,635
Net income	$ 11,613	$ 11,282	$ 11,220	$ 11,203	$ 5,796	$ 10,050	$ 10,063	$ 10,858	$ 45,318	$ 36,767	$ 28,061
Earnings per share:
Basic (in dollars per share)	$ 1.24	$ 1.21	$ 1.20	$ 1.20	$ 0.63	$ 1.07	$ 1.07	$ 1.16	$ 4.85	$ 3.93	$ 3.01
Diluted (in dollars per share)	$ 1.24	$ 1.21	$ 1.20	$ 1.20	$ 0.62	$ 1.07	$ 1.07	$ 1.16	$ 4.85	$ 3.92	$ 3.01

Investment Securities - Carryin

Investment Securities - Carrying Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Investment in subsidiary bank	$ 355,303	$ 318,926
Securities available for sale, Percent	100.00%	100.00%
US Treasury [Member]
Debt Securities, Available-for-sale [Abstract]
Investment in subsidiary bank	$ 128,585	$ 83,155
Securities available for sale, Percent	36.19%	26.07%
Other securities (FHLB, FHLMC and FNMA) [Member]
Debt Securities, Available-for-sale [Abstract]
Investment in subsidiary bank	$ 15,229	$ 34,871
Securities available for sale, Percent	4.29%	10.93%
State and political subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Investment in subsidiary bank	$ 211,489	$ 200,900
Securities available for sale, Percent	59.52%	63.00%

Investment Securities - Carry_2

Investment Securities - Carrying Amount of Available-for-Sale Securities and Approximate Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 351,069	$ 321,660
Gross Unrealized Gains	4,564	402
Gross Unrealized (Losses)	(330)	(3,136)
Estimated Fair Value	355,303	318,926
US Treasury [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	127,096	83,839
Gross Unrealized Gains	1,626	124
Gross Unrealized (Losses)	(137)	(808)
Estimated Fair Value	128,585	83,155
Other securities (FHLB, FHLMC and FNMA) [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,287	35,371
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(58)	(500)
Estimated Fair Value	15,229	34,871
State and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	208,686	202,450
Gross Unrealized Gains	2,938	278
Gross Unrealized (Losses)	(135)	(1,828)
Estimated Fair Value	$ 211,489	$ 200,900

Investment Securities - Availab

Investment Securities - Available-for-Sale Securities Classified as per Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Amortized Cost
Due in one year or less	$ 63,191
Due after one year through five years	196,456
Due after five years through ten years	81,854
Due over ten years	9,568
Amortized Cost	351,069	$ 321,660
Fair Value
Due in one year or less	63,189
Due after one year through five years	198,559
Due after five years through ten years	84,025
Due over ten years	9,530
Total	$ 355,303	$ 318,926

Investment Securities Available

Investment Securities Available-for-sale, debt securities, summary of proceeds, gains and losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Available-for-sale, debt securities, realized gains (loss) [Abstract]
Sales proceeds	$ 12,467	$ 0	$ 0
Gross realized gains	24	0
Gross realized losses	$ 52	$ 0

Investment Securities - Narrati

Investment Securities - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Investment in subsidiary bank	$ 355,303	$ 318,926
Collateralized Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment in subsidiary bank	$ 12,930

Investment Securities - Avail_2

Investment Securities - Available-for-Sale Securities, Continuous Unrealized Loss Position, Fair Value (Details) $ in Thousands	Dec. 31, 2019USD ($)security	Dec. 31, 2018USD ($)security
Less than 12 months
Number of securities | security	77	119
Fair Value	$ 45,813	$ 45,666
Unrealized Loss	$ (255)	$ (211)
Percent of Unrealized Loss	0.56%	0.46%
12 months or more
Number of securities | security	27	358
Fair Value	$ 21,549	$ 159,235
Unrealized Loss	$ (75)	$ (2,925)
Percent of Unrealized Loss	0.35%	1.84%
Total
Number of securities | security	104	477
Fair Value	$ 67,362	$ 204,901
Unrealized Loss	$ (330)	$ (3,136)
Percent of Unrealized Loss	0.49%	1.53%
US Treasury Securities [Member]
Less than 12 months
Number of securities | security	11	6
Fair Value	$ 27,932	$ 14,644
Unrealized Loss	$ (136)	$ (49)
Percent of Unrealized Loss	0.49%	0.33%
12 months or more
Number of securities | security	1	19
Fair Value	$ 2,495	$ 46,443
Unrealized Loss	$ (1)	$ (759)
Percent of Unrealized Loss	0.04%	1.63%
Total
Number of securities | security	12	25
Fair Value	$ 30,427	$ 61,087
Unrealized Loss	$ (137)	$ (808)
Percent of Unrealized Loss	0.45%	1.32%
Other securities (FHLB, FHLMC and FNMA) [Member]
Less than 12 months
Number of securities | security	0	0
Fair Value	$ 0	$ 0
Unrealized Loss	$ 0	$ 0
Percent of Unrealized Loss	0.00%	0.00%
12 months or more
Number of securities | security	6	14
Fair Value	$ 15,229	$ 34,871
Unrealized Loss	$ (58)	$ (500)
Percent of Unrealized Loss	0.38%	1.43%
Total
Number of securities | security	6	14
Fair Value	$ 15,229	$ 34,871
Unrealized Loss	$ (58)	$ (500)
Percent of Unrealized Loss	0.38%	1.43%
State and political subdivisions [Member]
Less than 12 months
Number of securities | security	66	113
Fair Value	$ 17,881	$ 31,022
Unrealized Loss	$ (119)	$ (162)
Percent of Unrealized Loss	0.67%	0.52%
12 months or more
Number of securities | security	20	325
Fair Value	$ 3,825	$ 77,921
Unrealized Loss	$ (16)	$ (1,666)
Percent of Unrealized Loss	0.42%	2.14%
Total
Number of securities | security	86	438
Fair Value	$ 21,706	$ 108,943
Unrealized Loss	$ (135)	$ (1,828)
Percent of Unrealized Loss	0.62%	1.68%

Loans - Classes of Loans (Detai

Loans - Classes of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of classes of loans [Abstract]
Loans and receivable	$ 2,639,104	$ 2,627,943	$ 2,459,671
Net unamortized fees and costs	933	952
Loans and receivable, gross	2,640,037	2,628,895
Less allowance for loan losses	33,760	37,810
Loans and receivable, net	2,606,277	2,591,085
Agricultural [Member]
Summary of classes of loans [Abstract]
Loans and receivable	91,317	92,673	88,580
Commercial and financial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	221,323	229,501	218,632
Construction, 1 to 4 family residential [Member]
Summary of classes of loans [Abstract]
Loans and receivable	80,209	72,279
Construction, land development and commercial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	108,410	113,807
Mortgage, farmland [Member]
Summary of classes of loans [Abstract]
Loans and receivable	242,730	236,454	$ 215,286
Mortgage, 1 to 4 family first liens [Member]
Summary of classes of loans [Abstract]
Loans and receivable	910,742	912,059
Mortgage, 1 to 4 family junior liens [Member]
Summary of classes of loans [Abstract]
Loans and receivable	149,227	152,625
Mortgage, multi-family [Member]
Summary of classes of loans [Abstract]
Loans and receivable	350,761	352,434
Mortgage, commercial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	402,181	383,314
Loans to individuals [Member]
Summary of classes of loans [Abstract]
Loans and receivable	32,308	30,072
Obligations of state and political subdivisions [Member]
Summary of classes of loans [Abstract]
Loans and receivable	$ 49,896	$ 52,725

Loans - Allowance For Credit Lo

Loans - Allowance For Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for loan losses:
Beginning balance	$ 37,810	$ 29,400	$ 26,530
Charge-offs	(2,969)	(2,322)	(2,104)
Recoveries	1,799	2,235	3,286
Provision	(2,880)	8,497	1,688
Ending balance	33,760	37,810	29,400
Ending balance, individually evaluated for impairment	1,084	2,114	2,166
Ending balance, collectively evaluated for impairment	32,676	35,696	27,234
Loan balances:
Ending balance	2,639,104	2,627,943	2,459,671
Ending balance, individually evaluated for impairment	20,925	27,985	31,487
Ending balance, collectively evaluated for impairment	2,618,179	2,599,958	2,428,184
Agricultural [Member]
Allowance for loan losses:
Beginning balance	2,789	2,294	2,947
Charge-offs	(266)	(95)	(167)
Recoveries	95	119	146
Provision	(218)	471	(632)
Ending balance	2,400	2,789	2,294
Ending balance, individually evaluated for impairment	87	479	133
Ending balance, collectively evaluated for impairment	2,313	2,310	2,161
Loan balances:
Ending balance	91,317	92,673	88,580
Ending balance, individually evaluated for impairment	1,730	2,460	4,916
Ending balance, collectively evaluated for impairment	89,587	90,213	83,664
Commercial and Financial [Member]
Allowance for loan losses:
Beginning balance	5,826	4,837	4,531
Charge-offs	(981)	(585)	(583)
Recoveries	646	1,057	1,183
Provision	(503)	517	(294)
Ending balance	4,988	5,826	4,837
Ending balance, individually evaluated for impairment	792	1,189	1,018
Ending balance, collectively evaluated for impairment	4,196	4,637	3,819
Loan balances:
Ending balance	221,323	229,501	218,632
Ending balance, individually evaluated for impairment	2,742	4,162	2,768
Ending balance, collectively evaluated for impairment	218,581	225,339	215,864
Real Estate: Construction and land development [Member]
Allowance for loan losses:
Beginning balance	3,292	2,989	2,890
Charge-offs	(45)	0	(114)
Recoveries	8	148	662
Provision	(656)	155	(449)
Ending balance	2,599	3,292	2,989
Ending balance, individually evaluated for impairment	0	4	39
Ending balance, collectively evaluated for impairment	2,599	3,288	2,950
Loan balances:
Ending balance	188,619	186,086	179,333
Ending balance, individually evaluated for impairment	421	1,137	957
Ending balance, collectively evaluated for impairment	188,198	184,949	178,376
Real Estate: Mortgage, farmland [Member]
Allowance for loan losses:
Beginning balance	3,972	3,669	3,417
Charge-offs	(6)	0	(3)
Recoveries	5	30	0
Provision	(21)	273	255
Ending balance	3,950	3,972	3,669
Ending balance, individually evaluated for impairment	0	0	238
Ending balance, collectively evaluated for impairment	3,950	3,972	3,431
Loan balances:
Ending balance	242,730	236,454	215,286
Ending balance, individually evaluated for impairment	4,081	3,612	7,962
Ending balance, collectively evaluated for impairment	238,649	232,842	207,324
Real Estate: Mortgage, 1 to 4 family [Member]
Allowance for loan losses:
Beginning balance	12,516	8,668	7,677
Charge-offs	(896)	(830)	(553)
Recoveries	700	612	661
Provision	(1,682)	4,066	883
Ending balance	10,638	12,516	8,668
Ending balance, individually evaluated for impairment	111	72	66
Ending balance, collectively evaluated for impairment	10,527	12,444	8,602
Loan balances:
Ending balance	1,059,969	1,064,684	975,791
Ending balance, individually evaluated for impairment	8,670	7,012	6,654
Ending balance, collectively evaluated for impairment	1,051,299	1,057,672	969,137
Real Estate: Mortgage, multi-family and commercial [Member]
Allowance for loan losses:
Beginning balance	8,165	5,700	4,045
Charge-offs	(341)	(251)	(130)
Recoveries	180	107	376
Provision	(145)	2,609	1,409
Ending balance	7,859	8,165	5,700
Ending balance, individually evaluated for impairment	1	306	482
Ending balance, collectively evaluated for impairment	7,858	7,859	5,218
Loan balances:
Ending balance	752,942	735,748	698,006
Ending balance, individually evaluated for impairment	3,188	9,538	8,040
Ending balance, collectively evaluated for impairment	749,754	726,210	689,966
Others [Member]
Allowance for loan losses:
Beginning balance	1,250	1,243	1,023
Charge-offs	(434)	(561)	(554)
Recoveries	165	162	258
Provision	345	406	516
Ending balance	1,326	1,250	1,243
Ending balance, individually evaluated for impairment	93	64	190
Ending balance, collectively evaluated for impairment	1,233	1,186	1,053
Loan balances:
Ending balance	82,204	82,797	84,043
Ending balance, individually evaluated for impairment	93	64	190
Ending balance, collectively evaluated for impairment	$ 82,111	$ 82,733	$ 83,853

Loans - Credit Quality Indicato

Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	$ 2,639,104	$ 2,627,943	$ 2,459,671
Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	91,317	92,673	88,580
Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	221,323	229,501	218,632
Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	80,209	72,279
Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	108,410	113,807
Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	242,730	236,454	$ 215,286
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	910,742	912,059
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	149,227	152,625
Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	350,761	352,434
Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	402,181	383,314
Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	32,308	30,072
Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	49,896	52,725
Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	68,021	80,323
Excellent [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,594	3,667
Excellent [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,461	3,322
Excellent [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	260	0
Excellent [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	190	209
Excellent [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,630	5,619
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	3,209	2,715
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	261	520
Excellent [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	18,955	22,058
Excellent [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	27,017	34,096
Excellent [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Excellent [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	7,444	8,117
Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	311,157	349,134
Good [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	12,380	15,342
Good [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	47,843	51,562
Good [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	8,868	13,029
Good [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	23,217	16,667
Good [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	40,118	52,364
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	32,474	33,134
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	4,233	4,569
Good [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	47,871	60,047
Good [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	79,467	86,453
Good [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	221	315
Good [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	14,465	15,652
Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,728,780	1,703,928
Satisfactory [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	43,308	39,897
Satisfactory [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	117,114	121,759
Satisfactory [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	51,093	42,043
Satisfactory [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	47,987	68,123
Satisfactory [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	134,738	126,706
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	751,215	752,473
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	136,079	138,533
Satisfactory [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	189,391	187,641
Satisfactory [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	206,196	177,271
Satisfactory [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	31,385	28,797
Satisfactory [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	20,274	20,685
Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	420,993	386,561
Monitor [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	24,857	27,510
Monitor [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	44,543	35,897
Monitor [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	17,505	15,045
Monitor [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	29,009	19,888
Monitor [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	53,147	41,486
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	96,353	96,187
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	5,473	6,242
Monitor [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	60,965	60,398
Monitor [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	81,381	74,990
Monitor [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	437	647
Monitor [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	7,323	8,271
Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	66,810	53,601
Special Mention [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,110	647
Special Mention [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	5,157	11,418
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	2,483	1,767
Special Mention [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	7,428	7,635
Special Mention [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,033	1,055
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	11,167	10,439
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	1,469	1,130
Special Mention [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	27,559	16,065
Special Mention [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,802	3,228
Special Mention [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	212	217
Special Mention [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	390	0
Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	43,343	54,396
Substandard [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,068	5,610
Substandard [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,205	5,543
Substandard [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	395
Substandard [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	579	1,285
Substandard [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	8,064	9,224
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	16,324	17,111
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	1,712	1,631
Substandard [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	6,020	6,225
Substandard [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,318	7,276
Substandard [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	53	96
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, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of past due loans [Abstract]
Total Past Due	$ 18,913	$ 13,629
Current	2,620,191	2,614,314
Ending balance	2,639,104	2,627,943	$ 2,459,671
Accruing Loans Past Due 90 Days or More	606	370
Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	560	1,161
Current	90,757	91,512
Ending balance	91,317	92,673	88,580
Accruing Loans Past Due 90 Days or More	48	0
Commercial and financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,406	1,672
Current	219,917	227,829
Ending balance	221,323	229,501	218,632
Accruing Loans Past Due 90 Days or More	65	0
Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	635	212
Current	79,574	72,067
Ending balance	80,209	72,279
Accruing Loans Past Due 90 Days or More	0	212
Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	316	435
Current	108,094	113,372
Ending balance	108,410	113,807
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,346	581
Current	241,384	235,873
Ending balance	242,730	236,454	$ 215,286
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	12,275	8,039
Current	898,467	904,020
Ending balance	910,742	912,059
Accruing Loans Past Due 90 Days or More	354	158
Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,172	235
Current	148,055	152,390
Ending balance	149,227	152,625
Accruing Loans Past Due 90 Days or More	139	0
Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	97	0
Current	350,664	352,434
Ending balance	350,761	352,434
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	810	1,077
Current	401,371	382,237
Ending balance	402,181	383,314
Accruing Loans Past Due 90 Days or More	0	0
Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	296	217
Current	32,012	29,855
Ending balance	32,308	30,072
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	49,896	52,725
Ending balance	49,896	52,725
Accruing Loans Past Due 90 Days or More	0	0
30 - 59 Days Past Due
Schedule of past due loans [Abstract]
Total Past Due	9,211	7,539
30 - 59 Days Past Due | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	163	1,026
30 - 59 Days Past Due | Commercial and financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,076	988
30 - 59 Days Past Due | Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	635	0
30 - 59 Days Past Due | Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	215	233
30 - 59 Days Past Due | Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	736	193
30 - 59 Days Past Due | Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	5,026	3,972
30 - 59 Days Past Due | Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	813	199
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	321	733
30 - 59 Days Past Due | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	226	195
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	4,472	2,262
60 - 89 Days Past Due | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	275	0
60 - 89 Days Past Due | Commercial and financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	229	459
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	101	202
60 - 89 Days Past Due | Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	388
60 - 89 Days Past Due | Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	3,100	833
60 - 89 Days Past Due | Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	126	36
60 - 89 Days Past Due | Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	97	0
60 - 89 Days Past Due | Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	489	344
60 - 89 Days Past Due | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	55	0
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	5,230	3,828
90 Days or More Past Due | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	122	135
90 Days or More Past Due | Commercial and financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	101	225
90 Days or More Past Due | Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	212
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	610	0
90 Days or More Past Due | Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	4,149	3,234
90 Days or More Past Due | Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	233	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	0
90 Days or More Past Due | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	15	22
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) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)loan
Receivables [Abstract]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan	1	0
Accruing loans past due 90 days or more increased	$ 240
Accruing loans past due 90 days or more percentage of total loans (in hundredths)	0.02%	0.01%
Average 90 days or more past due loan balance	$ 80	$ 190
TDR loans default payment	65
Impaired loans increase	$ 7,060
Percentages of impaired loans to loans held for investment (in hundredths)	0.79%	1.06%
Decrease Specific Reserve Loans Financing Receivable Unpaid Principal Balance	$ 8,070
Increase in nonaccrual loans	60
Decrease in TDR loans	770
Increase (Decrease) Accruing Loans Past days or More Financing Receivable Unpaid Principal Balance	$ 240
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, 2019		Dec. 31, 2018
Summary of certain impaired loan information [Abstract]
Non-accrual loans	$ 10,768	[1]	$ 10,829
Accruing loans past due 90 days or more	606		370
TDR loans	9,308		8,539
Agricultural [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,192	[1]	1,338
Accruing loans past due 90 days or more	48		0
TDR loans	404		120
Commercial and financial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	679	[1]	1,476
Accruing loans past due 90 days or more	65		0
TDR loans	1,934		2,686
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	0		212
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	320		328
Mortgage, farmland [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,369	[1]	1,062
Accruing loans past due 90 days or more	0		0
TDR loans	2,712		3,301
Mortgage, 1 to 4 family first liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	6,558	[1]	5,799
Accruing loans past due 90 days or more	354		158
TDR loans	1,626		1,143
Mortgage, 1 to 4 family junior liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	94	[1]	0
Accruing loans past due 90 days or more	139		0
TDR loans	0		24
Mortgage, multi-family [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	97	[1]	145
Accruing loans past due 90 days or more	0		0
TDR loans	1,719		0
Mortgage, commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	779	[1]	1,009
Accruing loans past due 90 days or more	0		0
TDR loans	593		937
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	$ 4,340		$ 4,840
[1]	There were $4.34 million and $4.84 million of TDR loans included within nonaccrual loans as of December 31, 2019 and 2018 , respectively.

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)contract	Dec. 31, 2018USD ($)contract
Summary of information for TDR loans [Abstract]
Number of contracts | contract	60	54
Recorded investment	$ 13,709	$ 13,375
Commitments outstanding	$ 98	$ 166
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	15	18
Pre-modification recorded investment	$ 4,121	$ 9,098
Post-modification recorded investment	$ 4,121	$ 9,098
Agricultural [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	9	5
Recorded investment	$ 1,552	$ 1,316
Commitments outstanding	$ 3	$ 91
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	4	1
Pre-modification recorded investment	$ 574	$ 163
Post-modification recorded investment	$ 574	$ 163
Commercial and financial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	16	13
Recorded investment	$ 2,641	$ 3,867
Commitments outstanding	$ 95	$ 75
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	5	6
Pre-modification recorded investment	$ 503	$ 2,294
Post-modification recorded investment	$ 503	$ 2,294
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	$ 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
Construction, land development and commercial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	2	2
Recorded investment	$ 320	$ 328
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	0	1
Pre-modification recorded investment	$ 0	$ 218
Post-modification recorded investment	$ 0	$ 218
Mortgage, farmland [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	8	8
Recorded investment	$ 4,021	$ 4,291
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	1	2
Pre-modification recorded investment	$ 620	$ 4,944
Post-modification recorded investment	$ 620	$ 4,944
Mortgage, 1 to 4 family first liens [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	16	16
Recorded investment	$ 2,083	$ 1,710
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	3	6
Pre-modification recorded investment	$ 705	$ 627
Post-modification recorded investment	$ 705	$ 627
Mortgage, 1 to 4 family junior liens [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	0	1
Recorded investment	$ 0	$ 24
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
Mortgage, multi-family [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	2	0
Recorded investment	$ 1,719	$ 0
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	2	0
Pre-modification recorded investment	$ 1,719	$ 0
Post-modification recorded investment	$ 1,719	$ 0
Mortgage, commercial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	7	9
Recorded investment	$ 1,373	$ 1,839
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	0	2
Pre-modification recorded investment	$ 0	$ 852
Post-modification recorded investment	$ 0	$ 852
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, 2019	Dec. 31, 2018	Dec. 31, 2017
Recorded Investment
With no related allowance recorded	$ 17,713	$ 15,201	$ 14,356
With a related allowance recorded	3,212	12,784	17,131
Total	20,925	27,985	31,487
Unpaid Principal Balance
With no related allowance recorded	22,527	19,515	18,735
With a related allowance recorded	3,570	13,023	17,202
Total	26,097	32,538	35,937
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	1,084	2,114	2,166
Total	1,084	2,114	2,166
Average Recorded Investment
With no related allowance recorded	18,035	15,090	15,306
With an related allowance recorded	3,489	13,005	17,810
Total	21,524	28,095	33,116
Interest Income Recognized
With no related allowance recorded	436	266	270
With an related allowance recorded	141	527	802
Total	577	793	1,072
Agricultural [Member]
Recorded Investment
With no related allowance recorded	1,596	1,395	1,822
With a related allowance recorded	134	1,065	3,094
Total	1,730	2,460	4,916
Unpaid Principal Balance
With no related allowance recorded	2,157	1,663	2,193
With a related allowance recorded	134	1,229	3,149
Total	2,291	2,892	5,342
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	87	479	133
Total	87	479	133
Average Recorded Investment
With no related allowance recorded	1,785	1,071	2,044
With an related allowance recorded	287	980	3,526
Total	2,072	2,051	5,570
Interest Income Recognized
With no related allowance recorded	37	23	19
With an related allowance recorded	17	7	160
Total	54	30	179
Commercial and financial [Member]
Recorded Investment
With no related allowance recorded	1,340	1,650	1,725
With a related allowance recorded	1,402	2,512	1,043
Total	2,742	4,162	2,768
Unpaid Principal Balance
With no related allowance recorded	2,220	2,503	2,487
With a related allowance recorded	1,539	2,512	1,043
Total	3,759	5,015	3,530
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	792	1,189	1,018
Total	792	1,189	1,018
Average Recorded Investment
With no related allowance recorded	1,617	1,977	2,080
With an related allowance recorded	1,510	2,793	1,249
Total	3,127	4,770	3,329
Interest Income Recognized
With no related allowance recorded	64	58	51
With an related allowance recorded	83	107	60
Total	147	165	111
Construction, 1 to 4 family residential [Member]
Recorded Investment
With no related allowance recorded	101	111	114
With a related allowance recorded	0	698	0
Total	101	809	114
Unpaid Principal Balance
With no related allowance recorded	144	148	150
With a related allowance recorded	0	698	0
Total	144	846	150
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	0	4	0
Total	0	4	0
Average Recorded Investment
With no related allowance recorded	106	113	116
With an related allowance recorded	0	622	0
Total	106	735	116
Interest Income Recognized
With no related allowance recorded	0	0	5
With an related allowance recorded	0	28	0
Total	0	28	5
Construction, land development and commercial [Member]
Recorded Investment
With no related allowance recorded	320	328	338
With a related allowance recorded	0	0	505
Total	320	328	843
Unpaid Principal Balance
With no related allowance recorded	336	344	371
With a related allowance recorded	0	0	505
Total	336	344	876
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	0	0	39
Total	0	0	39
Average Recorded Investment
With no related allowance recorded	324	333	344
With an related allowance recorded	0	0	321
Total	324	333	665
Interest Income Recognized
With no related allowance recorded	18	18	14
With an related allowance recorded	0	0	14
Total	18	18	28
Mortgage, farmland [Member]
Recorded Investment
With no related allowance recorded	4,081	3,612	2,523
With a related allowance recorded	0	0	5,439
Total	4,081	3,612	7,962
Unpaid Principal Balance
With no related allowance recorded	4,613	4,071	2,902
With a related allowance recorded	0	0	5,439
Total	4,613	4,071	8,341
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	0	0	238
Total	0	0	238
Average Recorded Investment
With no related allowance recorded	4,144	3,068	2,476
With an related allowance recorded	0	0	5,596
Total	4,144	3,068	8,072
Interest Income Recognized
With no related allowance recorded	157	89	56
With an related allowance recorded	0	0	242
Total	157	89	298
Mortgage, 1 to 4 family first liens [Member]
Recorded Investment
With no related allowance recorded	7,157	6,089	6,045
With a related allowance recorded	1,280	899	577
Total	8,437	6,988	6,622
Unpaid Principal Balance
With no related allowance recorded	9,015	7,819	7,507
With a related allowance recorded	1,501	974	593
Total	10,516	8,793	8,100
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	64	70	63
Total	64	70	63
Average Recorded Investment
With no related allowance recorded	6,822	6,435	6,286
With an related allowance recorded	1,318	888	585
Total	8,140	7,323	6,871
Interest Income Recognized
With no related allowance recorded	51	36	80
With an related allowance recorded	29	25	20
Total	80	61	100
Mortgage, 1 to 4 family junior liens [Member]
Recorded Investment
With no related allowance recorded	0	0	7
With a related allowance recorded	233	24	25
Total	233	24	32
Unpaid Principal Balance
With no related allowance recorded	246	254	482
With a related allowance recorded	233	24	25
Total	479	278	507
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	47	2	3
Total	47	2	3
Average Recorded Investment
With no related allowance recorded	0	0	23
With an related allowance recorded	239	25	26
Total	239	25	49
Interest Income Recognized
With no related allowance recorded	0	0	0
With an related allowance recorded	6	1	1
Total	6	1	1
Mortgage, multi-family [Member]
Recorded Investment
With no related allowance recorded	1,816	145	218
With a related allowance recorded	0	7,447	6,179
Total	1,816	7,592	6,397
Unpaid Principal Balance
With no related allowance recorded	1,930	213	355
With a related allowance recorded	0	7,447	6,179
Total	1,930	7,660	6,534
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	0	305	480
Total	0	305	480
Average Recorded Investment
With no related allowance recorded	1,873	153	231
With an related allowance recorded	0	7,543	6,247
Total	1,873	7,696	6,478
Interest Income Recognized
With no related allowance recorded	83	0	0
With an related allowance recorded	0	346	281
Total	83	346	281
Real Estate: Mortgage, commercial [Member]
Recorded Investment
With no related allowance recorded	1,302	1,871	1,564
With a related allowance recorded	70	75	79
Total	1,372	1,946	1,643
Unpaid Principal Balance
With no related allowance recorded	1,852	2,486	2,274
With a related allowance recorded	70	75	79
Total	1,922	2,561	2,353
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	1	1	2
Total	1	1	2
Average Recorded Investment
With no related allowance recorded	1,364	1,940	1,706
With an related allowance recorded	73	77	81
Total	1,437	2,017	1,787
Interest Income Recognized
With no related allowance recorded	26	42	45
With an related allowance recorded	4	4	4
Total	30	46	49
Loans to individuals [Member]
Recorded Investment
With no related allowance recorded	0	0	0
With a related allowance recorded	93	64	190
Total	93	64	190
Unpaid Principal Balance
With no related allowance recorded	14	14	14
With a related allowance recorded	93	64	190
Total	107	78	204
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	93	64	190
Total	93	64	190
Average Recorded Investment
With no related allowance recorded	0	0	0
With an related allowance recorded	62	77	179
Total	62	77	179
Interest Income Recognized
With no related allowance recorded	0	0	0
With an related allowance recorded	2	9	20
Total	$ 2	$ 9	$ 20

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Gross	$ 86,971	$ 83,804
Less accumulated depreciation	49,825	46,753
Net	37,146	37,051
Land [Member]
Property, Plant and Equipment [Line Items]
Gross	11,261	10,899
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross	37,261	36,815
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Gross	$ 38,449	$ 36,090

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Lease term, option to extend (up to)	10 years
Lease term, option to terminate (within)	1 year
Total operating lease expense	$ 620
Operating lease costs	530
Short-term lease costs	30
Variable lease costs	60
Operating lease liabilities	530
Right-of-use assets obtained in exchange for operating lease obligations	3,581
Operating lease right-of-use assets included in other assets	3,200
Total operating lease liabilities	$ 3,227
Lease term for operating leases	10 years 10 months 9 days
Weighted average discount rate for operating leases	3.46%
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lease term	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease term	16 years

Leases - Schedule of maturities

Leases - Schedule of maturities of lease liabilities (Details) $ in Thousands	Dec. 31, 2019USD ($)
Leases [Abstract]
2020	$ 470
2021	456
2022	447
2023	301
2024	250
Thereafter	2,009
Total lease payments	3,933
Less imputed interest	(706)
Total operating lease liabilities	$ 3,227

Interest-Bearing Deposits - Sum

Interest-Bearing Deposits - Summary of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Interest-bearing Deposit Liabilities [Abstract]
NOW and other demand	$ 610,271	$ 542,388
Savings	981,827	925,214
Time, $100,000 and over	292,982	228,551
Other time	388,672	352,819
Total deposits	$ 2,273,752	$ 2,048,972

Interest-Bearing Deposits (Narr

Interest-Bearing Deposits (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Interest-bearing Deposit Liabilities [Abstract]
Total brokered deposits	$ 109,290	$ 132,460
Average interest rate of brokered deposits	1.65%	2.46%
Brokered deposits included in savings deposits	$ 109,290	$ 132,460

Interest-Bearing Deposits - Tim

Interest-Bearing Deposits - Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Interest-bearing Deposit Liabilities [Abstract]
Due in one year or less	$ 324,554	$ 229,091
Due after one year through two years	124,527	223,254
Due after two years through three years	90,009	44,610
Due after three years through four years	130,252	35,002
Due over four years	12,312	49,413
Time Deposits	$ 681,654	$ 581,370

Federal Home Loan Bank Borrow_3

Federal Home Loan Bank Borrowings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 185,000,000	$ 215,000,000
Loan borrowed against collateral	0	0
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
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		25,000,000
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
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	$ 60,000,000	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	2.94%
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 ($)	Dec. 13, 2019	Feb. 06, 2018	Jan. 17, 2018	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances [Line Items]
FHLB, prepayment borrowings due 2025	$ 30,000,000
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				$ 2,090,000	$ 0
Federal home loan bank stock				11,065,000	12,172,000
Loans receivable 1 to 4 family mortgage loans Pledged As Collateral				249,750,000	290,250,000
Loans receivable commercial real estate and multi family mortgage loans pledged as collateral				306,860,000	296,530,000
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%
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				2.94%

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect	$ (470)	$ 1,080
Net-of-tax amount	1,415	(3,250)
Net unrealized gain on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	4,234	(2,734)
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	$ (2,349)	$ (1,596)

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($)	May 14, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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		7,720	8,172
Cash contributions to ESOP		$ 1,080,000	$ 1,050,000	$ 1,010,000
Percentage of cash contributions to ESOP		4.50%	4.50%	4.50%
Employer discretionary contribution amount		$ 1,080,000	$ 1,050,000	$ 1,010,000
Employer matching contribution		$ 220,000	$ 210,000	$ 200,000
Percentage of cash contributions to profit sharing		4.50%	4.50%	4.50%
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		$ 60,000	$ 30,000	$ 240,000
Period of interest rate swap used to calculate expected life of options		10 years
Stock options granted (in shares)		5,805	0	0
Weighted-average fair value of options granted (in dollars per share)		$ 21.31
Stock option outstanding weighted-average exercise price (in dollars per share)		$ 45.92
Stock options outstanding, weighted average remaining contractual life		5 years 5 months 19 days
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost		$ 110,000
Unrecognized compensation, stock options, weighted-average period		4 years 4 months 24 days
Number of exercisable stock options		7,220
Stock options exercisable, weighted average exercise price (in dollars per share)		$ 33
Number of shares available for stock options (in shares)		19,853
Restricted common stock shares subject to forfeiture upon termination		7,200	15,200	15,200
Number of years of employment subject to forfeiture		8 years	8 years	8 years
Employee Stock Option [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Risk-free interest rate	2.39%
Expected option life	7 years 6 months
Expected volatility	33.00%
Expected dividends	$ 0.0123
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)		19,853	38,125
Number of restricted shares authorized		23,527	24,899	27,407
Expense relating to awards		$ 960,000	$ 850,000	$ 580,000
Director [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation liability recorded in other liabilities		3,940,000	3,520,000
Deferred compensation expenses included in other noninterest expense		$ 280,000	430,000	370,000
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		$ 4,890,000	5,900,000
Deferred compensation expenses included in salaries and employee benefits expense		$ 420,000	$ 850,000	$ 810,000
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, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Shares held by the ESOP	797,317	801,147
Fair value per share	$ 65	$ 61
Maximum cash obligation	$ 51,826,000	$ 48,870,000

Employee Benefit Plans - Summar

Employee Benefit Plans - Summary of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 110
Period of interest rate swap used to calculate expected life of options	10 years
Number of shares available for stock options (in shares)	19,853
Issuance of common stock (in shares)	101,912	113,373	114,935
Forfeiture Of Shares Of Common Stock Shares (in shares)	5,255	3,296	3,934
Number of Shares
Options Outstanding Beginning Balance (in shares)	9,020	10,220	19,380
Granted (in shares)	5,805	0	0
Exercised (in shares)	(1,800)	(1,200)	(9,160)
Options Outstanding Ending Balance (in shares)	13,025	9,020	10,220	19,380
Weighted- Average Exercise Price
Options Outstanding Weighted Average Exercise Price Beginning Balance (in dollars per share)	$ 33.30	$ 33.44	$ 29.92
Options Outstanding Weighted Average Exercise Price Ending Balance (in dollars per share)	$ 45.92	$ 33.30	$ 33.44	$ 29.92
Weighted-Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term	5 years 5 months 19 days	3 years 4 months 28 days	4 years 5 months 12 days	3 years 10 days
Aggregate Intrinsic Value (In Thousands)
Aggregate Intrinsic Value	$ 248	$ 250	$ 342	$ 580
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for stock options (in shares)	19,853	38,125
Issuance of common stock (in shares)	23,527
Weighted average number of net shares issued (redeemed)	$ 63.96
Forfeiture Of Shares Of Common Stock Shares (in shares)	5,255
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value	$ 49.91

Employee Benefit Plans - Other

Employee Benefit Plans - Other Pertinent Information Related to Options (Details)	12 Months Ended
	Dec. 31, 2019$ / sharesshares
Defined Benefit Plan Disclosure [Line Items]
Stock option outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 45.92
Number Outstanding (in shares)	13,025
Remaining Contractual Life	5 years 5 months 19 days
Number of exercisable stock options	7,220
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	28 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	$ 62
Number Outstanding (in shares)	5,805
Remaining Contractual Life	113 months
Number of exercisable stock options	0

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal									$ 8,857	$ 7,783	$ 13,770
State									2,391	3,093	2,529
Deferred:
Federal									1,068	(1,560)	3,426
State									233	(411)	(188)
Total	$ 3,030	$ 3,303	$ 3,199	$ 3,017	$ 1,140	$ 2,590	$ 2,603	$ 2,572	$ 12,549	$ 8,905	$ 19,537

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
Allowance for loan losses	$ 8,423	$ 9,434
Deferred compensation	2,047	2,211
Unrealized losses on interest rate swaps	586	398
Accrued expenses	716	668
State net operating loss	929	795
Unrealized losses on investment securities	0	682
Gross deferred tax assets	12,701	14,188
Valuation allowance	(929)	(795)
Deferred tax asset, net of valuation allowance	11,772	13,393
Deferred income tax liabilities:
Property and equipment	1,955	1,728
Unrealized gains on investment securities	1,056	0
Goodwill	407	407
Other	336	389
Gross deferred tax liabilities	3,754	2,524
Net deferred tax assets	$ 8,018	$ 10,869

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Valuation allowance (decrease) increase	$ (134,000)	$ 41,000
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	21.70%	19.50%	41.00%
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, 2019, 2018, 2017 and 2016
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Income tax year, under examination	December 31, 2019, 2018, 2017 and 2016

Income Taxes - Summary of Chang

Income Taxes - Summary of Change in Deferred Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Consolidated statements of income	$ (1,301)	$ 1,971	$ (3,238)
Consolidated statements of stockholders' equity	1,550	92	(567)
Net change in deferred income tax	$ 2,851	$ 2,063	$ (3,805)

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of effective income tax rate with federal statutory tax rate
Expected tax expense, Amount									$ 12,152,000	$ 9,591,000	$ 16,659,000
Expected tax expense, Percent Of Pretax Income									20.90%	21.00%	35.00%
Tax-exempt interest, Amount									$ (1,201,000)	$ (1,122,000)	$ (1,771,000)
Tax-exempt interest, Percent Of Pretax Income									(2.10%)	(2.50%)	(3.70%)
Interest expense limitation, Amount									$ 109,000	$ 87,000	$ 103,000
Interest expenses limitation, Percent Of Pretax Income									0.20%	0.20%	0.20%
State income taxes, net of federal income tax benefit, Amount									$ 2,073,000	$ 2,119,000	$ 1,522,000
State income taxes, net of federal income tax benefit, Percent Of Pretax Income									3.50%	4.60%	3.20%
Income tax credits, Amount									$ (531,000)	$ (1,292,000)	$ (1,426,000)
Income tax credits, Percent Of Pretax Income									(0.90%)	(2.80%)	(3.00%)
Effective income tax rate reconciliation, deferred tax revaluation, amount									$ 0	$ 0	$ 4,710,000
Effective income tax rate reconciliation, deferred tax revaluation, percent									0.00%	0.00%	9.90%
Other, Amount									$ (53,000)	$ (478,000)	$ (260,000)
Other, Percent Of Pretax Income									0.10%	(1.00%)	(0.60%)
Total	$ 3,030,000	$ 3,303,000	$ 3,199,000	$ 3,017,000	$ 1,140,000	$ 2,590,000	$ 2,603,000	$ 2,572,000	$ 12,549,000	$ 8,905,000	$ 19,537,000
Total, Percent Of Pretax Income									21.70%	19.50%	41.00%
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, 2019	Dec. 31, 2018
Parent Company [Member]
Minimum regulatory requirements [Abstract]
Total risk-based capital, Actual Amount	$ 454,452	$ 414,772
Total risk-based capital, Actual Ratio	18.15%	17.18%
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	$ 423,122	$ 384,502
Tier 1 risk-based capital, Actual Ratio	16.90%	15.93%
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	$ 423,122	$ 384,502
Tier one common equity capital to risk weighted assets	16.90%	15.93%
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	$ 423,122	$ 384,502
Leverage ratio, Actual Ratio	12.77%	12.68%
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	$ 455,440	$ 416,198
Total risk-based capital, Actual Ratio	18.20%	17.25%
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	$ 424,127	$ 385,943
Tier 1 risk-based capital, Actual Ratio	16.95%	16.00%
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	$ 424,127	$ 385,943
Tier one common equity capital to risk weighted assets	16.95%	16.00%
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	$ 424,127	$ 385,943
Leverage ratio, Actual Ratio	12.81%	12.73%
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, 2019	Dec. 31, 2018
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions [Abstract]
Retained Earnings, available for payment of dividends	$ 223,920
Cash reserve balances	$ 221,180	$ 14,680

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in loans to related parties [Roll Forward]
Balance, beginning	$ 51,216	$ 42,496
Net increase (decrease) due to change in related parties	2,481	188
Advances	17,243	28,194
Collections	(15,223)	(19,662)
Balance, ending	55,717	51,216
Related Party Deposits	$ 11,160	$ 7,130

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Value and Estimated Fair Values (Details) - USD ($) $ in Thousands		Dec. 31, 2019		Dec. 31, 2018
Readily Available Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents		$ 241,965	[1]	$ 43,305	[2]
Investment securities		128,585	[1]	83,155	[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		370,550	[1]	126,460	[2]
Deposits
Noninterest-bearing deposits		0	[1]	0	[2]
Interest-bearing deposits		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		237,783	[3]	247,943	[4]
Loans held for sale		8,400	[3]	1,984	[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		12,442	[3]	11,784	[4]
Total financial instrument assets		258,625	[3]	261,711	[4]
Deposits
Noninterest-bearing deposits		387,612	[3]	372,152	[4]
Interest-bearing deposits		2,292,332	[3]	2,059,336	[4]
Federal Home Loan Bank borrowings		186,091	[3]	207,948	[4]
Interest rate swaps	[3]	2,349		1,596
Accrued interest payable		2,474	[3]	1,812	[4]
Total financial instrument liabilities		2,870,858	[3]	2,642,844	[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		90,118	[5]	93,736	[6]
Commercial and financial		217,640	[5]	227,774	[6]
Real estate:
Construction, 1 to 4 family residential		79,954	[5]	72,419	[6]
Construction, land development and commercial		107,276	[5]	112,960	[6]
Mortgage, farmland		239,521	[5]	235,771	[6]
Mortgage, 1 to 4 family first liens		896,676	[5]	882,908	[6]
Mortgage, 1 to 4 family junior liens		143,261	[5]	148,128	[6]
Mortgage, multi-family		349,663	[5]	342,099	[6]
Mortgage, commercial		395,838	[5]	376,257	[6]
Loans to individuals		32,722	[5]	29,962	[6]
Obligations of state and political subdivisions		50,564	[5]	51,945	[6]
Accrued interest receivable		0	[5]	0	[6]
Total financial instrument assets		2,603,233	[5]	2,573,959	[6]
Deposits
Noninterest-bearing deposits		0	[5]	0	[6]
Interest-bearing deposits		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		241,965		43,305
Investment securities		366,368		331,098
Loans held for sale		8,400		1,984
Loans
Agricultural		88,917		89,884
Commercial and financial		216,335		223,675
Real estate:
Construction, 1 to 4 family residential		79,096		70,982
Construction, land development and commercial		106,924		111,812
Mortgage, farmland		238,780		232,482
Mortgage, 1 to 4 family first liens		902,630		902,261
Mortgage, 1 to 4 family junior liens		147,634		150,859
Mortgage, multi-family		346,938		348,351
Mortgage, commercial		398,145		379,232
Loans to individuals		31,455		29,349
Obligations of state and political subdivisions		49,423		52,198
Accrued interest receivable		12,442		11,784
Total financial instrument assets		3,235,452		2,979,256
Deposits
Noninterest-bearing deposits		387,612		372,152
Interest-bearing deposits		2,273,752		2,048,972
Federal Home Loan Bank borrowings		185,000		215,000
Interest rate swaps		2,349		1,596
Accrued interest payable		2,474		1,812
Total financial instrument liabilities		2,851,187		2,639,532
Financial instrument with off-balance sheet risk:
Loan commitments		424,165		375,940
Letters of credit		8,569		9,033
Total financial instrument liabilities with off-balance-sheet risk		432,734		384,973
Estimated Fair Value [Member]
Financial instrument assets:
Cash and cash equivalents		241,965		43,305
Investment securities		366,368		331,098
Loans held for sale		8,400		1,984
Loans
Agricultural		90,118		93,736
Commercial and financial		217,640		227,774
Real estate:
Construction, 1 to 4 family residential		79,954		72,419
Construction, land development and commercial		107,276		112,960
Mortgage, farmland		239,521		235,771
Mortgage, 1 to 4 family first liens		896,676		882,908
Mortgage, 1 to 4 family junior liens		143,261		148,128
Mortgage, multi-family		349,663		342,099
Mortgage, commercial		395,838		376,257
Loans to individuals		32,722		29,962
Obligations of state and political subdivisions		50,564		51,945
Accrued interest receivable		12,442		11,784
Total financial instrument assets		3,232,408		2,962,130
Deposits
Noninterest-bearing deposits		387,612		372,152
Interest-bearing deposits		2,292,332		2,059,336
Federal Home Loan Bank borrowings		186,091		207,948
Interest rate swaps		2,349		1,596
Accrued interest payable		2,474		1,812
Total financial instrument liabilities		2,870,858		2,642,844
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, 2019	Dec. 31, 2018
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		$ 355,303	$ 318,926
US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		128,585	83,155
State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		211,489	200,900
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]	(2,349)	(1,596)
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		352,954	317,330
Recurring Basis [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		128,585	83,155
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		211,489	200,900
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		15,229	34,871
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		(2,349)
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			(1,596)
Recurring Basis [Member] | Readily Available Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	[4]	128,585	83,155
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]	128,585	83,155
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]	224,369	234,175
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]	211,489	200,900
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]	15,229	34,871
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]	(2,349)
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]		(1,596)
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, 2019		Dec. 31, 2018
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	370,550	[1]	126,460	[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	258,625	[3]	261,711	[4]
Company Determined Market Prices [Member]
Loans
Agricultural	90,118	[5]	93,736	[6]
Commercial and financial	217,640	[5]	227,774	[6]
Real Estate:
Construction, land development and commercial	107,276	[5]	112,960	[6]
Mortgage, farmland	239,521	[5]	235,771	[6]
Mortgage, 1 to 4 family first liens	896,676	[5]	882,908	[6]
Mortgage, 1 to 4 family junior liens	143,261	[5]	148,128	[6]
Mortgage, multi-family	349,663	[5]	342,099	[6]
Mortgage, commercial	395,838	[5]	376,257	[6]
Loans to individuals	32,722	[5]	29,962	[6]
Total financial instrument assets	2,603,233	[5]	2,573,959	[6]
Nonrecurring Basis [Member]
Loans
Agricultural	1,272	[7]	1,160	[8]
Commercial and financial	1,803	[7]	2,882	[8]
Real Estate:
Construction, 1 to 4 family residential	0	[7]	0	[8]
Construction, land development and commercial	215	[7]	703	[8]
Mortgage, farmland	3,576	[7]	3,848	[8]
Mortgage, 1 to 4 family first liens	7,986	[7]	6,729	[8]
Mortgage, 1 to 4 family junior liens	49	[7]	22	[8]
Mortgage, multi-family	1,816	[7]	7,286	[8]
Mortgage, commercial	1,237	[7]	1,458	[8]
Loans to individuals	0	[7]	0	[8]
Foreclosed assets	0	[9]	0	[10]
Total financial instrument assets	17,954	[7]	24,088	[8]
Total Losses	1,038	[7]	1,114	[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	1,272	[7],[15]	1,160	[8],[16]
Commercial and financial	1,803	[7],[15]	2,882	[8],[16]
Real Estate:
Construction, 1 to 4 family residential	0	[7],[15]	0	[8],[16]
Construction, land development and commercial	215	[7],[15]	703	[8],[16]
Mortgage, farmland	3,576	[7],[15]	3,848	[8],[16]
Mortgage, 1 to 4 family first liens	7,986	[7],[15]	6,729	[8],[16]
Mortgage, 1 to 4 family junior liens	49	[7],[15]	22	[8],[16]
Mortgage, multi-family	1,816	[7],[15]	7,286	[8],[16]
Mortgage, commercial	1,237	[7],[15]	1,458	[8],[16]
Loans to individuals	0	[7],[15]	0	[8],[16]
Foreclosed assets	0	[9],[15]	0	[10],[16]
Total financial instrument assets	17,954	[15]	24,088	[16]
Agricultural [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	36	[7]	63	[8]
Commercial and financial [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	499	[7]	122	[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	8	[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	370	[7]	520	[8]
Mortgage, 1 to 4 family junior liens [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	60	[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	125	[7]	349	[8]
Loans to individuals [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	0	[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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents at subsidiary bank	$ 241,965	$ 43,305
Investment in subsidiary bank	355,303	318,926
Other assets	9,491	3,595
Total Assets	3,300,887	3,042,464
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities	2,873,850	2,658,712
Redeemable common stock held by ESOP	51,826	48,870
Stockholders' equity:
Capital stock	0	0
Retained earnings	409,509	371,848
Accumulated other comprehensive gain (loss)	1,415	(3,250)
Treasury stock at cost	(39,830)	(36,968)
Total Stockholders' Equity	427,037	383,752
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	375,211	334,882	$ 311,716	$ 289,270
Total Liabilities & Stockholders' Equity	3,300,887	3,042,464
Parent Company [Member]
ASSETS
Cash and cash equivalents at subsidiary bank	5,114	3,742	$ 4,015	$ 543
Investment in subsidiary bank	428,042	385,193
Other assets	1,331	1,231
Total Assets	434,487	390,166
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities	7,450	6,414
Redeemable common stock held by ESOP	51,826	48,870
Stockholders' equity:
Capital stock	55,943	52,122
Retained earnings	409,509	371,848
Accumulated other comprehensive gain (loss)	1,415	(3,250)
Treasury stock at cost	(39,830)	(36,968)
Total Stockholders' Equity	427,037	383,752
Less maximum cash obligation related to ESOP shares	51,826	48,870
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	375,211	334,882
Total Liabilities & Stockholders' Equity	$ 434,487	$ 390,166

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Income before income taxes	$ 14,643	$ 14,585	$ 14,419	$ 14,220	$ 6,936	$ 12,640	$ 12,666	$ 13,430	$ 57,867	$ 45,672	$ 47,598
Income tax benefit	(3,030)	(3,303)	(3,199)	(3,017)	(1,140)	(2,590)	(2,603)	(2,572)	(12,549)	(8,905)	(19,537)
Net income	$ 11,613	$ 11,282	$ 11,220	$ 11,203	$ 5,796	$ 10,050	$ 10,063	$ 10,858	45,318	36,767	28,061
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiary									7,657	11,502	7,485
Other expenses									(708)	(786)	(741)
Income before income taxes									6,949	10,716	6,744
Income tax benefit									271	273	73
Total income after tax benefit									7,220	10,989	6,817
Equity in undistributed income of subsidiary									38,098	25,778	21,244
Net income									$ 45,318	$ 36,767	$ 28,061

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 11,613	$ 11,282	$ 11,220	$ 11,203	$ 5,796	$ 10,050	$ 10,063	$ 10,858	$ 45,318	$ 36,767	$ 28,061
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:
Share-based compensation									14	0	11
Compensation expensed through issuance of common stock									1,133	1,466	1,446
Forfeiture of common stock									(262)	(152)	(156)
(Increase) decrease in other assets									(2,681)	(1,086)	972
Net cash and cash equivalents provided by operating activities									39,320	47,738	45,898
Cash Flows from Financing Activities
Issuance of common stock, net of costs									5,026	4,713	3,762
Stock options exercised									62	41	238
Purchase of treasury stock									(5,534)	(6,784)	(2,435)
Proceeds from the issuance of common stock through the employee stock purchase plan									434	421	325
Dividends paid									(7,657)	(7,003)	(6,485)
Net cash and cash equivalents used by financing activities									202,571	43,947	274,169
Increase (decrease) in cash and cash equivalents									198,660	(111,048)	116,156
Cash and cash equivalents:
Beginning of year				43,305					43,305
Ending of year	241,965				43,305				241,965	43,305
Parent Company [Member]
Cash flows from operating activities:
Net income									45,318	36,767	28,061
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:
Equity in undistributed income of subsidiary									(38,098)	(25,778)	(21,244)
Share-based compensation									14	0	11
Compensation expensed through issuance of common stock									1,133	1,466	1,446
Forfeiture of common stock									(262)	(152)	(156)
(Increase) decrease in other assets									(100)	162	237
Increase in other liabilities									1,036	574	3,212
Net cash and cash equivalents provided by operating activities									9,041	13,039	11,567
Cash Flows from Financing Activities
Issuance of common stock, net of costs									5,026	4,713	3,762
Stock options exercised									62	41	238
Purchase of treasury stock									(5,534)	(6,784)	(2,435)
Proceeds from the issuance of common stock through the employee stock purchase plan									434	421	325
Capital contribution to subsidiary									0	(4,700)	(3,500)
Dividends paid									(7,657)	(7,003)	(6,485)
Net cash and cash equivalents used by financing activities									(7,669)	(13,312)	(8,095)
Increase (decrease) in cash and cash equivalents									1,372	(273)	3,472
Cash and cash equivalents:
Beginning of year				$ 3,742				$ 4,015	3,742	4,015	543
Ending of year	$ 5,114				$ 3,742				$ 5,114	$ 3,742	$ 4,015

Commitments and Contingencies_2

Commitments and Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Investment in securities issued by state and political subdivisions within the state of Iowa	$ 101,940,000
Liabilities for potential obligations from standby letters of credit issued	0	$ 0
Rent expense	$ 400,000	$ 360,000	$ 370,000

Commitments and Contingencies -

Commitments and Contingencies - Summary of Bank's Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Home equity loans [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	$ 65,203	$ 59,330
Credit cards [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	57,421	52,802
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	94,490	89,171
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	207,051	174,637
Outstanding letters of credit [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	$ 8,569	$ 9,033

Commitments and Contingencies_3

Commitments and Contingencies - Minimum Future Rental Commitments (Details) $ in Thousands	Dec. 31, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
2020	$ 469
2021	375
2022	319
2023	316
2024	82
Thereafter	1
Total	$ 1,562

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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 33,280	$ 33,969	$ 33,236	$ 31,847	$ 31,291	$ 30,411	$ 29,064	$ 28,031	$ 132,332	$ 118,797	$ 105,952
Interest expense	8,677	9,274	8,848	8,074	7,453	6,891	6,241	5,738	34,873	26,323	17,972
Net interest income	24,603	24,695	24,388	23,773	23,838	23,520	22,823	22,293	97,459	92,474	87,980
Provision for loan losses	(1,238)	144	(540)	(1,246)	6,958	1,593	711	(765)	(2,880)	8,497	1,688
Other income	7,053	6,638	5,851	5,250	5,288	6,668	6,234	5,628	24,792	23,818	20,818
Other expense	18,251	16,604	16,360	16,049	15,232	15,955	15,680	15,256	67,264	62,123	59,512
Income before income taxes	14,643	14,585	14,419	14,220	6,936	12,640	12,666	13,430	57,867	45,672	47,598
Income taxes	3,030	3,303	3,199	3,017	1,140	2,590	2,603	2,572	12,549	8,905	19,537
Net income	$ 11,613	$ 11,282	$ 11,220	$ 11,203	$ 5,796	$ 10,050	$ 10,063	$ 10,858	$ 45,318	$ 36,767	$ 28,061
Basic earnings per share (in dollars per share)	$ 1.24	$ 1.21	$ 1.20	$ 1.20	$ 0.63	$ 1.07	$ 1.07	$ 1.16	$ 4.85	$ 3.93	$ 3.01
Diluted earnings per share (in dollars per share)	$ 1.24	$ 1.21	$ 1.20	$ 1.20	$ 0.62	$ 1.07	$ 1.07	$ 1.16	$ 4.85	$ 3.92	$ 3.01

Derivative Financial Instrume_3

Derivative Financial Instruments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Nov. 07, 2013USD ($)derivative
Derivatives, Fair Value [Line Items]
Collateral required by the bank	$ 2,350,000
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, 2019	Dec. 31, 2018	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	(279,000)	(120,000)
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	$ (2,070,000)	$ (1,476,000)

Derivative Financial Instrume_5

Derivative Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Net change in unrealized (loss) gain on derivatives	$ (753)	$ 1,223	$ 1,119
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 (loss) gain on derivatives	(119)	347
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 (loss) gain on derivatives	(446)	571
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) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Estimated unfunded commitments liability		$ 33,760	$ 37,810	$ 29,400	$ 26,530
Subsequent Event [Member] | Minimum [Member] | Unfunded Loan Commitment [Member] | Accounting Standards Update 2016-13 [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Estimated unfunded commitments liability	$ 1,000
Subsequent Event [Member] | Minimum [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Accounting Standards Update 2016-13 [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Estimated increase to allowance for credit losses for loans	3,000
Subsequent Event [Member] | Maximum [Member] | Unfunded Loan Commitment [Member] | Accounting Standards Update 2016-13 [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Estimated unfunded commitments liability	2,000
Subsequent Event [Member] | Maximum [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Accounting Standards Update 2016-13 [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Estimated increase to allowance for credit losses for loans	$ 4,000