Hills Bancorporation (HBIA) 10-Q 3 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	HILLS BANCORPORATION
Entity Central Index Key	732,417
Current Fiscal Year End Date	--12-31
Entity Well-known Season Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		9,338,187
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 151,273	$ 38,197
Investment securities available for sale at fair value (amortized cost March 31, 2017 $273,538; December 31, 2016 $269,039)	273,409	267,537
Stock of Federal Home Loan Bank	12,607	12,413
Loans held for sale	1,656	9,806
Loans, net of allowance for loan losses (March 31, 2017 $26,450; December 31, 2016 $26,530)	2,281,541	2,251,445
Property and equipment, net	38,335	37,859
Tax credit real estate investment	10,539	10,563
Accrued interest receivable	10,286	9,121
Deferred income taxes, net	12,056	12,611
Other real estate	218	237
Goodwill	2,500	2,500
Other assets	2,632	3,481
Total Assets	2,797,052	2,655,770
Liabilities
Noninterest-bearing deposits	339,867	348,505
Interest-bearing deposits	1,833,465	1,687,807
Total deposits	2,173,332	2,036,312
Other borrowings	28,086	33,489
Federal Home Loan Bank borrowings	235,000	235,000
Accrued interest payable	940	984
Other liabilities	22,586	19,934
Total Liabilities	2,459,944	2,325,719
Redeemable Common Stock Held by Employee Stock Ownership Plan (ESOP)	43,341	40,781
STOCKHOLDERS' EQUITY
Common stock, no par value; authorized 20,000,000 shares; issued March 31, 2017 10,310,582 shares; December 31, 2016 10,227,178 shares	0	0
Paid in capital	48,676	44,606
Retained earnings	322,371	319,982
Accumulated other comprehensive loss	(2,296)	(3,359)
Treasury stock at cost (March 31, 2017 972,297 shares; December 31, 2016 962,951 shares)	(31,643)	(31,178)
Total Stockholders' Equity	337,108	330,051
Less maximum cash obligation related to ESOP shares	43,341	40,781
Total Stockholders' Equity Less Maximum Cash Obligations Related to ESOP Shares	293,767	289,270
Total Liabilities & Stockholders' Equity	$ 2,797,052	$ 2,655,770

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Investment securities available for sale, amortized cost	$ 273,538	$ 269,039
Loans, allowance for loan losses	$ 26,450	$ 26,530
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)	10,310,582	10,227,178
Treasury stock at cost (in shares)	972,297	962,951

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income:
Loans, including fees	$ 23,890	$ 22,528
Investment securities:
Taxable	393	356
Nontaxable	833	828
Federal funds sold	64	44
Total interest income	25,180	23,756
Interest expense:
Deposits	2,128	1,921
Short-term borrowings	22	30
FHLB borrowings	1,833	2,132
Total interest expense	3,983	4,083
Net interest income	21,197	19,673
Provision for loan losses	(814)	549
Net interest income after provision for loan losses	22,011	19,124
Noninterest income:
Net gain on sale of loans	316	289
Trust fees	1,879	1,728
Service charges and fees	2,132	2,055
Net gain on sale of other real estate owned and other repossessed assets	34	34
Other noninterest income	880	767
Noninterest income	5,241	4,873
Noninterest expenses:
Salaries and employee benefits	7,980	6,984
Occupancy	1,042	1,001
Furniture and equipment	1,429	1,404
Office supplies and postage	461	401
Advertising and business development	790	786
Outside services	2,008	1,776
FDIC insurance assessment	207	303
Other noninterest expense	494	397
Noninterest expenses	14,411	13,052
Income before income taxes	12,841	10,945
Income taxes	3,967	3,245
Net income	$ 8,874	$ 7,700
Earnings per share:
Basic (in dollars per share)	$ 0.95	$ 0.83
Diluted (in dollars per share)	$ 0.95	$ 0.83

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 8,874	$ 7,700
Securities:
Net change in unrealized loss on securities available for sale	1,373	1,018
Reclassification adjustment for net gains realized in net income	0	0
Income taxes	(526)	(390)
Other comprehensive income on securities available for sale	847	628
Derivatives used in cash flow hedging relationships:
Net change in unrealized loss on derivatives	349	(1,753)
Income taxes	(133)	670
Other comprehensive income (loss) on cash flow hedges	216	(1,083)
Other comprehensive income (loss), net of tax	1,063	(455)
Comprehensive income	$ 9,937	$ 7,245

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Unearned ESOP Shares [Member]	Treasury Stock [Member]	Maximum Cash Obligation Related To ESOP Shares [Member]
Beginning Balance at Dec. 31, 2015	$ 272,175	$ 43,697	$ 294,487	$ (1,195)	$ 0	$ (27,252)	$ (37,562)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 1,626 and 84,638 shares of common stock for 3 months ended March 31, 2016 and 2017, respectively	73	73
Issuance 1,234 shares of common stock under the employee stock purchase plan for 3 months ended March 31, 2016	54	54
Unearned restricted stock compensation	56	56
Share-based compensation	7	7
Income tax benefit related to share-based compensation	2	2
Change related to ESOP shares	(426)						(426)
Net income	7,700		7,700
Cash dividends ($0.65 and $0.70 per share for 3 months ended March 31, 2016 and 2017, respectively)	(6,060)		(6,060)
Purchase of 35,252 and 9,346 shares of common stock for 3 months ended March 31, 2016 and 2017, respectively	(1,579)					(1,579)
Other comprehensive loss	(455)			(455)
Ending Balance at Mar. 31, 2016	271,547	43,889	296,127	(1,650)	0	(28,831)	(37,988)
Beginning Balance at Dec. 31, 2016	289,270	44,606	319,982	(3,359)	0	(31,178)	(40,781)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 1,626 and 84,638 shares of common stock for 3 months ended March 31, 2016 and 2017, respectively	3,966	3,966
Unearned restricted stock compensation	96	96
Forfeiture of 1,234 shares of common stock for 3 months ended March 31, 2017		(48)
Share-based compensation	12	12
Income tax benefit related to share-based compensation	44	44
Change related to ESOP shares	(2,560)						(2,560)
Net income	8,874		8,874
Cash dividends ($0.65 and $0.70 per share for 3 months ended March 31, 2016 and 2017, respectively)	(6,485)		(6,485)
Purchase of 35,252 and 9,346 shares of common stock for 3 months ended March 31, 2016 and 2017, respectively	(465)					(465)
Other comprehensive loss	1,063			1,063
Ending Balance at Mar. 31, 2017	$ 293,767	$ 48,676	$ 322,371	$ (2,296)	$ 0	$ (31,643)	$ (43,341)

CONSOLIDATED STATEMENTS OF STO7

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]
Issuance of common stock (in shares)	84,368	1,626
Issuance of common stock purchased under the employee stock purchase plan (in shares)		1,234
Forfeiture of common stock (in shares)	1,234	0
Cash dividends (in dollars per share)	$ 0.70	$ 0.65
Purchase of common stock (in shares)	9,346	35,252

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income	$ 8,874	$ 7,700
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation	757	727
Provision for loan losses	(814)	549
Share-based compensation	12	7
Forfeiture of common stock	(48)	0
Compensation expensed through issuance of common stock	85	127
Excess tax benefits from share-based compensation	(44)	(2)
Provision for deferred income taxes	(104)	(481)
Net gain on sale of other real estate owned and other repossessed assets	(34)	(34)
Increase in accrued interest receivable	(1,165)	(1,348)
Amortization of premium on investment securities, net	151	148
Decrease in other assets	1,241	739
Increase in accrued interest payable and other liabilities	2,704	1,567
Loans originated for sale	(23,735)	(32,243)
Proceeds on sales of loans	32,201	33,515
Net gain on sales of loans	(316)	(289)
Net cash and cash equivalents provided by operating activities	19,765	10,682
Cash Flows from Investing Activities
Proceeds from maturities of investment securities available for sale	8,206	11,031
Purchases of investment securities available for sale	(13,049)	(10,627)
Loans made to customers, net of collections	(29,401)	(8,995)
Proceeds on sale of other real estate owned and other repossessed assets	172	133
Purchases of property and equipment	(1,233)	(1,619)
Income from tax credit real estate, net	24	68
Net cash and cash equivalents used in investing activities	(35,281)	(10,009)
Cash Flows from Financing Activities
Net increase in deposits	137,020	88,879
Net (decrease) increase in other borrowings	(5,403)	1,330
Net increase in FHLB borrowings	0	15,000
Issuance of common stock, net of costs	3,762	0
Stock options exercised	119	0
Excess tax benefits related to share-based compensation	44	2
Purchase of treasury stock	(465)	(1,579)
Dividends paid	(6,485)	(6,060)
Net cash and cash equivalents provided by financing activities	128,592	97,572
Increase in cash and cash equivalents	113,076	98,245
Cash and cash equivalents:
Beginning of period	38,197	35,427
End of period	151,273	133,672
Cash payments for:
Interest paid to depositors	2,172	1,929
Interest paid on other obligations	1,855	2,162
Income taxes paid	0	342
Noncash activities:
Increase in maximum cash obligation related to ESOP shares	2,560	426
Transfers to other real estate owned	95	0
Sale and financing of other real estate owned	$ 214	$ 135

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation: The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial reporting and with instructions for Form 10-Q and Regulation S-X. These financial statements include all adjustments (consisting of normal recurring accruals) which in the opinion of management are considered necessary for the fair presentation of the financial position and results of operations for the periods shown. Certain prior year amounts have been reclassified to conform to the current year presentation. The Company considers that it operates as one business segment, a commercial bank. Operating results for the three month period ended March 31, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2017. For further information, refer to the consolidated financial statements and footnotes thereto included in the Form 10-K Annual Report of Hills Bancorporation and subsidiary (the “Company”) for the year ended December 31, 2016 filed with the Securities Exchange Commission on March 3, 2017 . The consolidated balance sheet as of December 31, 2016 , has been derived from the audited consolidated financial statements for that period. The Company evaluated subsequent events through the filing date of its quarterly report on Form 10-Q with the SEC. 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 good 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. For financial institutions, significant changes are not expected given that most financial instruments are not in the scope of the accounting standard update. ASU 2014-09 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. In August 2015, FASB issued ASU 2015-14 deferring the effective date for annual periods and interim periods within those annual periods after December 15, 2017. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is in the process of evaluating its noninterest income streams and how they might be impacted by the new guidance. The adoption of ASU 2014-09 by the Company is not expected to have a material impact. 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 adoption of ASU 2016-01 by the Company is not expected to have a material impact. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases . The ASU provides guidance requiring lessees to recognize right-of-use 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 adoption of ASU 2016-02 by the Company is not expected to have a material impact. 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 adoption of ASU 2016-04 by the Company is not expected to have a material impact. In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting . The ASU simplifies several aspects of the accounting for share-based payment transaction, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For public companies, ASU 2016-09 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. The Company adopted ASU 2016-09 for the period ending March 31, 2017. 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. We are currently evaluating the impact the CECL model will have on our accounting, but we expect to recognize a one-time cumulative-effect adjustment to our allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective. 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 permitting a company to perform its annual or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized when the carrying amount exceeds fair value. For public companies, ASU 2017-04 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The adoption of ASU No. 2017-04 by the Company is not expected to have a material impact. In March 2017, the FASB issued ASU No. 2017-08, Receivable - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities. This ASU shortens the amortization period for certain callable debt securities held at a premium. The premium will be amortized to the earliest call date. For public companies, ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2018. The Company adopted ASU 2017-08 for the period ending March 31, 2017. There was no material impact on the financial statements.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is computed using the weighted average number of actual common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that would occur from the exercise of common stock options outstanding. ESOP shares are considered outstanding for this calculation unless unearned. The computation of basic and diluted earnings per share for the periods presented is as follows: Three Months Ended March 31, 2017 2016 Common shares outstanding at the beginning of the period 9,264,227 9,322,054 Weighted average number of net shares issued (redeemed) 61,124 (14,370 ) Weighted average shares outstanding (basic) 9,325,351 9,307,684 Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method 6,190 6,130 Weighted average number of shares (diluted) 9,331,541 9,313,814 Net income (In thousands) $ 8,874 $ 7,700 Earnings per share: Basic $ 0.95 $ 0.83 Diluted $ 0.95 $ 0.83

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following table summarizes the balances of each component of accumulated other comprehensive income (AOCI), included in stockholders’ equity, at March 31, 2017 and December 31, 2016 : March 31, December 31, 2016 (amounts in thousands) Net unrealized loss on available-for-sale securities $ (129 ) $ (1,502 ) Net unrealized loss on derivatives used for cash flow hedges (3,589 ) (3,938 ) Tax effect $ 1,422 $ 2,081 Net-of-tax amount $ (2,296 ) $ (3,359 )

Securities

Securities	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The carrying values of investment securities at March 31, 2017 and December 31, 2016 are summarized in the following table (dollars in thousands): March 31, 2017 December 31, 2016 Amount Percent Amount Percent Securities available for sale U.S. Treasury $ 32,389 11.85 % $ 27,482 10.27 % Other securities (FHLB, FHLMC and FNMA) 57,744 21.12 61,660 23.05 State and political subdivisions 183,276 67.03 178,395 66.68 Total securities available for sale $ 273,409 100.00 % $ 267,537 100.00 % 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. There were no trading or held to maturity securities as of March 31, 2017 or December 31, 2016 . The carrying amount of available-for-sale securities and their approximate fair values were as follows as of March 31, 2017 and December 31, 2016 (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value March 31, 2017: U.S. Treasury $ 32,320 $ 80 $ (11 ) $ 32,389 Other securities (FHLB, FHLMC and FNMA) 58,029 45 (330 ) 57,744 State and political subdivisions 183,189 1,020 (933 ) 183,276 Total $ 273,538 $ 1,145 $ (1,274 ) $ 273,409 December 31, 2016: U.S. Treasury $ 27,418 $ 82 $ (18 ) $ 27,482 Other securities (FHLB, FHLMC and FNMA) 62,047 65 (452 ) 61,660 State and political subdivisions 179,574 626 (1,805 ) 178,395 Total $ 269,039 $ 773 $ (2,275 ) $ 267,537 The amortized cost and estimated fair value of available-for-sale securities classified according to their contractual maturities at March 31, 2017 , were as follows (in thousands): Amortized Cost Fair Value Due in one year or less $ 54,197 $ 54,263 Due after one year through five years 144,824 145,067 Due after five years through ten years 73,442 73,007 Due over ten years 1,075 1,072 Total $ 273,538 $ 273,409 As of March 31, 2017 investment securities with a carrying value of $45.51 million were pledged to collateralize repurchase agreements, derivative financial instruments, and other borrowings. The following table shows the fair value, gross unrealized losses and the percentage of fair value represented by gross unrealized losses of applicable investment securities owned by the Company, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2017 and December 31, 2016 (in thousands): Less than 12 months 12 months or more Total March 31, 2017 # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % U.S. Treasury 2 $ 4,937 $ (11 ) 0.22 % — $ — $ — — % 2 $ 4,937 $ (11 ) 0.22 % Other securities (FHLB, FHLMC and FNMA) 12 29,741 (330 ) 1.11 — — — — 12 29,741 (330 ) 1.11 State and political subdivisions 237 57,946 (904 ) 1.56 11 1,500 (29 ) 1.93 248 59,446 (933 ) 1.57 Total temporarily impaired securities 251 $ 92,624 $ (1,245 ) 1.34 % 11 $ 1,500 $ (29 ) 1.93 % 262 $ 94,124 $ (1,274 ) 1.35 % Less than 12 months 12 months or more Total December 31, 2016 # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % U.S. Treasury 2 $ 4,957 $ (18 ) 0.36 % — $ — $ — — % 2 $ 4,957 $ (18 ) 0.36 % Other securities (FHLB, FHLMC and FNMA) 14 34,648 (452 ) 1.30 — — — — 14 34,648 (452 ) 1.30 State and political subdivisions 365 87,841 (1,762 ) 2.01 11 1,486 (43 ) 2.89 376 89,327 (1,805 ) 2.02 Total temporarily impaired securities 381 $ 127,446 $ (2,232 ) 1.75 % 11 $ 1,486 $ (43 ) 2.89 % 392 $ 128,932 $ (2,275 ) 1.76 % 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 the credit quality of any of the issues 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	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Loans	Loans Classes of loans are as follows: March 31, December 31, (Amounts In Thousands) Agricultural $ 87,934 $ 92,871 Commercial and financial 199,702 192,995 Real estate: Construction, 1 to 4 family residential 63,784 57,864 Construction, land development and commercial 125,144 121,561 Mortgage, farmland 205,334 202,340 Mortgage, 1 to 4 family first liens 780,407 767,469 Mortgage, 1 to 4 family junior liens 127,721 125,400 Mortgage, multi-family 303,653 302,831 Mortgage, commercial 334,067 334,198 Loans to individuals 24,710 25,157 Obligations of state and political subdivisions 54,709 54,462 $ 2,307,165 $ 2,277,148 Net unamortized fees and costs 826 827 $ 2,307,991 $ 2,277,975 Less allowance for loan losses 26,450 26,530 $ 2,281,541 $ 2,251,445 Changes in the allowance for loan losses, the allowance for loan losses applicable to impaired loans and the related loan balance of impaired loans for the three months ended March 31, 2017 were as follows: Three Months Ended March 31, 2017 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) Allowance for loan losses: Beginning balance $ 2,947 $ 4,531 $ 2,890 $ 3,417 $ 7,677 $ 4,045 $ 1,023 $ 26,530 Charge-offs — (220 ) — — (145 ) — (188 ) (553 ) Recoveries 38 454 381 — 133 180 101 1,287 Provision (480 ) (866 ) (177 ) 90 507 133 (21 ) (814 ) Ending balance $ 2,505 $ 3,899 $ 3,094 $ 3,507 $ 8,172 $ 4,358 $ 915 $ 26,450 Ending balance, individually evaluated for impairment $ 587 $ 144 $ 72 $ 345 $ 62 $ 15 $ 36 $ 1,261 Ending balance, collectively evaluated for impairment $ 1,918 $ 3,755 $ 3,022 $ 3,162 $ 8,110 $ 4,343 $ 879 $ 25,189 Loans: Ending balance $ 87,934 $ 199,702 $ 188,928 $ 205,334 $ 908,128 $ 637,720 $ 79,419 $ 2,307,165 Ending balance, individually evaluated for impairment $ 11,388 $ 1,787 $ 671 $ 8,502 $ 5,521 $ 2,034 $ 36 $ 29,939 Ending balance, collectively evaluated for impairment $ 76,546 $ 197,915 $ 188,257 $ 196,832 $ 902,607 $ 635,686 $ 79,383 $ 2,277,226 Changes in the allowance for loan losses for the three months ended March 31, 2016 were as follows: Three Months Ended March 31, 2016 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) Allowance for loan losses: Beginning balance $ 3,082 $ 4,517 $ 2,280 $ 3,342 $ 8,172 $ 4,223 $ 894 $ 26,510 Charge-offs — (55 ) — (10 ) (344 ) (66 ) (169 ) (644 ) Recoveries 142 253 52 — 213 11 44 715 Provision (270 ) (404 ) 427 612 (5 ) 22 167 549 Ending balance $ 2,954 $ 4,311 $ 2,759 $ 3,944 $ 8,036 $ 4,190 $ 936 $ 27,130 Ending balance, individually evaluated for impairment $ 868 $ 268 $ 32 $ 670 $ 310 $ 88 $ 22 $ 2,258 Ending balance, collectively evaluated for impairment $ 2,086 $ 4,043 $ 2,727 $ 3,274 $ 7,726 $ 4,102 $ 914 $ 24,872 Loans: Ending balance $ 90,620 $ 173,736 $ 163,900 $ 189,882 $ 844,039 $ 600,680 $ 74,582 $ 2,137,439 Ending balance, individually evaluated for impairment $ 12,647 $ 2,406 $ 1,450 $ 8,098 $ 5,594 $ 3,649 $ 22 $ 33,866 Ending balance, collectively evaluated for impairment $ 77,973 $ 171,330 $ 162,450 $ 181,784 $ 838,445 $ 597,031 $ 74,560 $ 2,103,573 The following table presents the credit quality indicators by type of loans in each category as of March 31, 2017 and December 31, 2016 , respectively (amounts in thousands): Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial March 31, 2017 Grade: Excellent $ 3,256 $ 9,520 $ — $ 635 Good 14,292 38,506 5,753 22,777 Satisfactory 37,290 115,447 45,876 51,858 Monitor 15,562 25,704 9,256 45,207 Special Mention 4,372 6,328 1,311 4,215 Substandard 13,162 4,197 1,588 452 Total $ 87,934 $ 199,702 $ 63,784 $ 125,144 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 March 31, 2017 Grade: Excellent $ 2,829 $ 1,183 $ 130 $ 5,882 Good 49,476 15,354 3,342 72,006 Satisfactory 104,287 659,704 115,372 182,985 Monitor 36,334 68,035 4,891 38,867 Special Mention 3,136 12,523 1,506 3,611 Substandard 9,272 23,608 2,480 302 Total $ 205,334 $ 780,407 $ 127,721 $ 303,653 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total March 31, 2017 Grade: Excellent $ 15,424 $ — $ — $ 38,859 Good 89,922 97 34,395 345,920 Satisfactory 186,099 23,903 17,160 1,539,981 Monitor 34,981 340 3,154 282,331 Special Mention 3,925 193 — 41,120 Substandard 3,716 177 — 58,954 Total $ 334,067 $ 24,710 $ 54,709 $ 2,307,165 Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial December 31, 2016 Grade: Excellent $ 4,205 $ 4,241 $ — $ 244 Good 13,611 43,472 1,701 25,337 Satisfactory 40,008 108,800 44,138 46,758 Monitor 12,699 20,023 8,896 44,487 Special Mention 8,381 11,177 972 4,250 Substandard 13,967 5,282 2,157 485 Total $ 92,871 $ 192,995 $ 57,864 $ 121,561 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 December 31, 2016 Grade: Excellent $ 2,916 $ 1,196 $ 65 $ 5,970 Good 47,569 15,725 3,002 71,822 Satisfactory 105,971 647,191 113,433 180,651 Monitor 29,778 66,164 4,877 40,444 Special Mention 7,004 12,914 1,566 3,636 Substandard 9,102 24,279 2,457 308 Total $ 202,340 $ 767,469 $ 125,400 $ 302,831 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total December 31, 2016 Grade: Excellent $ 15,873 $ — $ — $ 34,710 Good 89,801 65 37,539 349,644 Satisfactory 185,650 24,446 16,417 1,513,463 Monitor 34,979 293 506 263,146 Special Mention 3,797 195 — 53,892 Substandard 4,098 158 — 62,293 Total $ 334,198 $ 25,157 $ 54,462 $ 2,277,148 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 March 31, 2017 and December 31, 2016 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) March 31, 2017 Agricultural $ 293 $ — $ 81 $ 374 $ 87,560 $ 87,934 $ — Commercial and financial 1,350 547 120 2,017 197,685 199,702 — Real estate: Construction, 1 to 4 family residential 1,411 — — 1,411 62,373 63,784 — Construction, land development and commercial 679 — 60 739 124,405 125,144 60 Mortgage, farmland 586 — — 586 204,748 205,334 — Mortgage, 1 to 4 family first liens 3,761 694 1,680 6,135 774,272 780,407 221 Mortgage, 1 to 4 family junior liens 132 21 136 289 127,432 127,721 — Mortgage, multi-family 4,354 — 40 4,394 299,259 303,653 — Mortgage, commercial 694 16 163 873 333,194 334,067 — Loans to individuals 97 9 — 106 24,604 24,710 — Obligations of state and political subdivisions — — — — 54,709 54,709 — $ 13,357 $ 1,287 $ 2,280 $ 16,924 $ 2,290,241 $ 2,307,165 $ 281 December 31, 2016 Agricultural $ 56 $ — $ 302 $ 358 $ 92,513 $ 92,871 $ — Commercial and financial 24 121 718 863 192,132 192,995 — Real estate: Construction, 1 to 4 family residential — — — — 57,864 57,864 — Construction, land development and commercial — 231 85 316 $ 121,245 121,561 — Mortgage, farmland 319 — — 319 202,021 202,340 — Mortgage, 1 to 4 family first liens 5,649 978 1,943 8,570 $ 758,899 767,469 192 Mortgage, 1 to 4 family junior liens 330 51 579 960 124,440 125,400 443 Mortgage, multi-family — — 40 40 $ 302,791 302,831 — Mortgage, commercial 371 — 207 578 333,620 334,198 — Loans to individuals 203 32 — 235 $ 24,922 25,157 — Obligations of state and political subdivisions — — — — 54,462 54,462 — $ 6,952 $ 1,413 $ 3,874 $ 12,239 $ 2,264,909 $ 2,277,148 $ 635 The Company does not have a material 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. Certain impaired loan information by loan type at March 31, 2017 and December 31, 2016 , was as follows: March 31, 2017 December 31, 2016 Non-accrual loans (1) Accruing loans past due 90 days or more TDR loans Non- accrual loans (1) Accruing loans past due 90 days or more TDR loans (Amounts In Thousands) (Amounts In Thousands) Agricultural $ 1,528 $ — $ 7,212 $ 1,741 $ — $ 91 Commercial and financial 1,278 — 509 1,354 — 1,057 Real estate: Construction, 1 to 4 family residential — — 265 — — 265 Construction, land development and commercial — 60 346 85 — 118 Mortgage, farmland 1,410 — 1,662 1,205 — 1,389 Mortgage, 1 to 4 family first liens 3,921 221 1,362 4,097 192 1,375 Mortgage, 1 to 4 family junior liens 149 — 26 136 443 26 Mortgage, multi-family 239 — — 243 — — Mortgage, commercial 719 — 1,075 1,077 — 1,087 $ 9,244 $ 281 $ 12,457 $ 9,938 $ 635 $ 5,408 (1) There were $4.17 million and $4.23 million of TDR loans included within nonaccrual loans as of March 31, 2017 and December 31, 2016 , respectively. Loans 90 days or more past due that are still accruing interest decreased $0.35 million from December 31, 2016 to March 31, 2017 due to a decrease in the number of loans past due greater than 90 days. As of March 31, 2017 there were 3 accruing loans past due 90 days or more. The average accruing loans past due as of March 31, 2017 are $0.09 million . There were 6 accruing loans past due 90 days or more as of December 31, 2016 and the average loan balance was $0.11 million . The accruing loans past due 90 days or more balances are believed to be adequately collateralized and the Company expects to collect all principal and interest as contractually due under these loans. The Company may modify the terms of a loan to maximize the collection of amounts due. Such a modification is considered a troubled debt restructuring (“TDR”). In most cases, the modification is either 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 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 March 31, 2017 and December 31, 2016 : March 31, 2017 December 31, 2016 Number of contracts Recorded investment Commitments outstanding Number of contracts Recorded investment Commitments outstanding (Amounts In Thousands) (Amounts In Thousands) Agricultural 7 $ 8,596 $ 143 4 $ 1,460 $ 167 Commercial and financial 11 1,426 551 14 2,053 117 Real estate: Construction, 1 to 4 family residential 3 265 119 3 265 1,225 Construction, land development and commercial 2 346 6 1 118 107 Mortgage, farmland 8 3,073 — 7 2,594 — Mortgage, 1 to 4 family first liens 12 1,454 — 12 1,471 — Mortgage, 1 to 4 family junior liens 1 26 16 1 26 65 Mortgage, multi-family — — — — — — Mortgage, commercial 8 1,440 — 10 1,650 — Loans to individuals — — — — — — 52 $ 16,626 $ 835 52 $ 9,637 $ 1,681 The following is a summary of TDR loans that were modified during the three months ended March 31, 2017 : Three Months Ended March 31, 2017 Number of contracts Pre-modification recorded investment Post-modification recorded investment (Amounts In Thousands) Agricultural 3 $ 8,783 $ 8,783 Commercial and financial — — — Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 1 231 231 Mortgage, farmland 2 598 598 Mortgage, 1 to 4 family first lien — — — Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family — — — Mortgage, commercial — — — 6 $ 9,612 $ 9,612 The Company had commitments to lend $0.84 million in additional borrowings to restructured loan customers as of March 31, 2017 . The Company had commitments to lend $1.68 million in additional borrowings to restructured loan customers as of December 31, 2016 . These commitments were in the normal course of business. The additional borrowings were not used to facilitate payments on these loans. There were no TDR loans that were in payment default (defined as past due 90 days or more) during the period ended March 31, 2017 and year ended December 31, 2016 . Information regarding impaired loans as of and for the three months ended March 31, 2017 is as follows: March 31, 2017 Three Months Ended Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: (Amounts In Thousands) Agricultural $ 1,528 $ 1,748 $ — $ 1,524 $ — Commercial and financial 1,531 2,163 — 1,555 5 Real estate: Construction, 1 to 4 family residential 117 151 — 117 1 Construction, land development and commercial 117 167 — 118 1 Mortgage, farmland 2,753 3,062 — 2,636 16 Mortgage, 1 to 4 family first liens 4,682 5,796 — 4,726 13 Mortgage, 1 to 4 family junior liens 149 645 — 151 — Mortgage, multi-family 239 361 — 241 — Mortgage, commercial 1,700 2,283 — 1,722 11 Loans to individuals — 18 — — — $ 12,816 $ 16,394 $ — $ 12,790 $ 47 With an allowance recorded: Agricultural $ 9,860 $ 9,860 $ 587 $ 9,967 $ 111 Commercial and financial 256 275 144 272 1 Real estate: Construction, 1 to 4 family residential 289 289 32 290 3 Construction, land development and commercial 148 148 40 148 2 Mortgage, farmland 5,749 5,749 345 5,751 61 Mortgage, 1 to 4 family first liens 664 703 59 684 4 Mortgage, 1 to 4 family junior liens 26 26 3 26 1 Mortgage, multi-family — — — — — Mortgage, commercial 95 97 15 97 1 Loans to individuals 36 36 36 33 1 $ 17,123 $ 17,183 $ 1,261 $ 17,268 $ 185 Total: Agricultural $ 11,388 $ 11,608 $ 587 $ 11,491 $ 111 Commercial and financial 1,787 2,438 144 1,827 6 Real estate: Construction, 1 to 4 family residential 406 440 32 407 4 Construction, land development and commercial 265 315 40 266 3 Mortgage, farmland 8,502 8,811 345 8,387 77 Mortgage, 1 to 4 family first liens 5,346 6,499 59 5,410 17 Mortgage, 1 to 4 family junior liens 175 671 3 177 1 Mortgage, multi-family 239 361 — 241 — Mortgage, commercial 1,795 2,380 15 1,819 12 Loans to individuals 36 54 36 33 1 $ 29,939 $ 33,577 $ 1,261 $ 30,058 $ 232 Information regarding impaired loans as of December 31, 2016 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded: (Amounts In Thousands) Agricultural $ 800 $ 971 $ — Commercial and financial 1,540 2,175 — Real estate: Construction, 1 to 4 family residential 117 151 — Construction, land development and commercial 204 290 — Mortgage, farmland 2,594 2,887 — Mortgage, 1 to 4 family first liens 5,011 6,137 — Mortgage, 1 to 4 family junior liens 153 646 — Mortgage, multi-family 243 362 — Mortgage, commercial 1,901 2,727 — Loans to individuals — 19 — $ 12,563 $ 16,365 $ — With an allowance recorded: Agricultural $ 10,920 $ 10,978 $ 856 Commercial and financial 937 955 718 Real estate: Construction, 1 to 4 family residential 815 815 105 Construction, land development and commercial — — — Mortgage, farmland 5,434 5,434 390 Mortgage, 1 to 4 family first liens 1,266 1,374 79 Mortgage, 1 to 4 family junior liens 612 667 11 Mortgage, multi-family — — — Mortgage, commercial 967 1,004 34 Loans to individuals 150 150 150 $ 21,101 $ 21,377 $ 2,343 Total: Agricultural $ 11,720 $ 11,949 $ 856 Commercial and financial 2,477 3,130 718 Real estate: Construction, 1 to 4 family residential 932 966 105 Construction, land development and commercial 204 290 — Mortgage, farmland 8,028 8,321 390 Mortgage, 1 to 4 family first liens 6,277 7,511 79 Mortgage, 1 to 4 family junior liens 765 1,313 11 Mortgage, multi-family 243 362 — Mortgage, commercial 2,868 3,731 34 Loans to individuals 150 169 150 $ 33,664 $ 37,742 $ 2,343 Impaired loans decreased $3.73 million from December 31, 2016 to March 31, 2017 . Impaired loans include any loan that has been placed on nonaccrual status, accruing loans past due 90 days or more and TDR loans. Impaired loans also include loans that, based on management’s evaluation of current information and events, the Company expects to be unable to collect in full according to the contractual terms of the original loan agreement. Impaired loans were 1.30% of loans held for investment as of March 31, 2017 and 1.48% as of December 31, 2016 . The decrease in impaired loans is due mainly to a decrease in nonaccrual loans of $0.70 million , a decrease of $9.45 million in relationships with a specific allowance for losses, and is offset by an increase in TDR loans of $7.05 million from December 31, 2016 to March 31, 2017 . The Company regularly reviews a substantial portion of the loans in the portfolio and assesses whether the loans are impaired in accordance with ASC 310. If the loans are impaired, the Company determines if a specific allowance is appropriate. In addition, the Company's management also reviews and, where determined necessary, provides allowances for particular loans based upon (1) reviews of specific borrowers and (2) management’s assessment of areas that management considers are of higher credit risk, including loans that have been restructured. Loans that are determined not to be impaired and for which there are no specific allowances are classified into one or more risk categories. Based upon the risk category assigned, the Company allocates a percentage, as determined by management, for a required allowance needed. The determination of the appropriate percentage begins with historical loss experience factors, which are then adjusted for levels and trends in past due loans, levels and trends in charged-off and recovered loans, trends in volume growth, trends in problem and watch loans, trends in restructured loans, local economic trends and conditions, industry and other conditions, and effects of changing interest rates. Specific allowances for losses on impaired loans are established if the loan balances exceed the net present value of the relevant future cash flows or the fair value of the relevant collateral based on updated appraisals and/or updated collateral analysis for the properties if the loan is collateral dependent. The Company may recognize a charge off or record a specific allowance related to an impaired loan if there is a collateral shortfall or it is unlikely the borrower can make all principal and interest payments as contractually due. 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. In general, this is the amount that the carrying value of the loan exceeds the related appraised value less estimated costs to sell the collateral. 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 an additional charge off or specific reserve based on the applicable facts and circumstances. In instances where there is an estimated decline in value, a specific reserve may be 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 specific reserve 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.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017 are as follows: March 31, 2017 Carrying Amount Estimated Fair Value Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) (Amounts In Thousands) Financial instrument assets: Cash and cash equivalents $ 151,273 $ 151,273 $ 151,273 $ — $ — Investment securities 286,016 286,016 — 286,016 — Loans held for sale 1,656 1,656 — 1,656 — Loans Agricultural 85,429 85,394 — — 85,394 Commercial and financial 195,803 195,651 — — 195,651 Real estate: Construction, 1 to 4 family residential 62,689 62,706 — — 62,706 Construction, land development and commercial 123,145 123,029 — — 123,029 Mortgage, farmland 201,827 201,988 — — 201,988 Mortgage, 1 to 4 family first liens 773,417 767,495 — — 767,495 Mortgage, 1 to 4 family junior liens 126,539 131,430 — — 131,430 Mortgage, multi-family 301,827 298,276 — — 298,276 Mortgage, commercial 331,535 328,530 — — 328,530 Loans to individuals 24,205 24,188 — — 24,188 Obligations of state and political subdivisions 54,299 53,115 — — 53,115 Accrued interest receivable 10,286 10,286 — 10,286 — Total financial instrument assets $ 2,729,946 $ 2,721,033 $ 151,273 $ 297,958 $ 2,271,802 Financial instrument liabilities Deposits Noninterest-bearing deposits $ 339,867 $ 339,867 $ — $ 339,867 $ — Interest-bearing deposits 1,833,465 1,837,543 — 1,837,543 — Other borrowings 28,086 28,086 — 28,086 — Federal Home Loan Bank borrowings 235,000 228,318 — 228,318 — Interest rate swaps 3,589 3,589 — 3,589 — Accrued interest payable 940 940 — 940 — Total financial instrument liabilities $ 2,440,947 $ 2,438,343 $ — $ 2,438,343 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 432,943 $ — $ — $ — $ — Letters of credit 8,885 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 441,828 $ — $ — $ — $ — (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, 2016 are as follows: December 31, 2016 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 $ 38,197 $ 38,197 $ 38,197 $ — $ — Investment securities 279,950 279,950 — 279,950 — Loans held for sale 9,806 9,806 — 9,806 — Loans Agricultural 89,924 89,862 — — 89,862 Commercial and financial 188,464 188,292 — — 188,292 Real estate: Construction, 1 to 4 family residential 56,841 56,715 — — 56,715 Construction, land development and commercial 119,694 119,716 — — 119,716 Mortgage, farmland 198,923 199,043 — — 199,043 Mortgage, 1 to 4 family first liens 760,909 764,174 — — 764,174 Mortgage, 1 to 4 family junior liens 124,283 129,339 — — 129,339 Mortgage, multi-family 301,162 297,646 — — 297,646 Mortgage, commercial 331,822 328,948 — — 328,948 Loans to individuals 24,515 24,499 — — 24,499 Obligations of state and political subdivisions 54,081 52,860 — — 52,860 Accrued interest receivable 9,121 9,121 — 9,121 — Total financial instrument assets $ 2,587,692 $ 2,588,168 $ 38,197 $ 298,877 $ 2,251,094 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 348,505 $ 348,505 $ — $ 348,505 $ — Interest-bearing deposits 1,687,807 1,691,679 — 1,691,679 — Other borrowings 33,489 33,489 — 33,489 — Federal Home Loan Bank borrowings 235,000 231,232 — 231,232 — Interest rate swaps 3,938 3,938 3,938 Accrued interest payable 984 984 — 984 — Total financial instrument liabilities $ 2,309,723 $ 2,309,827 $ — $ 2,309,827 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 388,666 $ — $ — $ — $ — Letters of credit 9,024 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 397,690 $ — $ — $ — $ — (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. 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 and for estimating fair value for assets or liabilities not recorded at fair value. ASSETS Cash and cash equivalents : The carrying amounts reported in the consolidated balance sheets for cash and short-term instruments approximate their fair values (Level 1). 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. All of the Company’s securities are considered Level 2. The pricing for investment securities is obtained from an independent source. There are no level 1 or 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 three months ended March 31, 2017 . 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 : 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. Loans : The Company does not record loans at fair value on a recurring basis. For variable-rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values (Level 3). The fair values for other loans are determined using estimated future cash flows, discounted at the interest rates currently being offered for loans with similar terms to borrowers with similar credit quality utilizing an entrance price concept (Level 3). The Company does record nonrecurring fair value adjustments to loans to reflect (1) partial write-downs that are based on the observable market price or appraised value of the collateral or (2) the full charge-off of the loan carrying value (Level 3). These loans are considered Level 3 as the instruments used to determine fair market value require significant management judgment and estimation. 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 cost 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). Accrued interest receivable : The fair value of accrued interest receivable equals the amount receivable due to the current nature of the amounts receivable (Level 2). Non-marketable equity investments : Non-marketable equity investments are recorded under the cost or equity method of accounting. There are generally restrictions on the sale and/or liquidation of these investments, including stock of the Federal Home Loan Bank. The carrying value of stock of the Federal Home Loan Bank approximates fair value (Level 2). LIABILITIES Deposit liabilities : Deposit liabilities are carried at historical cost. The fair value of demand deposits, savings accounts and certain money market account deposits is the amount payable on demand at the reporting date. The fair value of fixed maturity certificates of deposit is estimated using the rates currently offered for deposits of similar remaining maturities. If the fair value of the fixed maturity certificates of deposit is calculated at less than the carrying amount, the carrying value of these deposits is reported as the fair value (Level 2). Deposit liabilities are classified as Level 2 due to available prices for similar liabilities in the market. Other borrowings : Other borrowings are carried at historical cost and include federal funds purchased and securities sold under agreements to repurchase. The carrying amount is a reasonable estimate of fair value because of the relatively short time between the origination of the liability and its expected realization (Level 2). Other borrowings are classified as Level 2 due to available prices for similar liabilities in the market. Federal Home Loan Bank borrowings : Federal Home Loan Bank borrowings are recorded at historical cost. The fair values of the Company’s Federal Home Loan Bank borrowings are estimated using discounted cash flow analysis, based on the Company’s current incremental borrowing rates for similar types of borrowing arrangements (Level 2). Federal Home Loan Bank borrowings are classified as Level 2 due to available prices for similar liabilities in the market. 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). Accrued interest payable : The fair value of accrued interest payable equals the amount payable due to the current nature of the amounts payable (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: March 31, 2017 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Securities available for sale (Amounts In Thousands) U.S. Treasury $ — $ 32,389 $ — $ 32,389 State and political subdivisions — 57,744 — 57,744 Other securities (FHLB, FHLMC and FNMA) — 183,276 — 183,276 Derivative Financial Instruments Interest rate swaps $ — (3,589 ) $ — (3,589 ) Total $ — $ 269,820 $ — $ 269,820 December 31, 2016 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 $ — $ 27,482 $ — $ 27,482 State and political subdivisions — 178,395 — 178,395 Other securities (FHLB, FHLMC and FNMA) — 61,660 — 61,660 Derivative Financial Instruments Interest rate swaps — (3,938 ) — (3,938 ) Total $ — $ 263,599 $ — $ 263,599 (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 three months ended March 31, 2017 and the year ended December 31, 2016 . 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. The following tables present the Company’s assets that are measured at fair value on a nonrecurring basis. March 31, 2017 Three Months Ended March 31, 2017 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 10,714 $ 10,714 $ — Commercial and financial — — 1,383 1,383 — Real Estate: Construction, 1 to 4 family residential — — 224 224 — Construction, land development and commercial — — 197 197 — Mortgage, farmland — — 7,624 7,624 — Mortgage, 1 to 4 family first liens — — 4,968 4,968 42 Mortgage, 1 to 4 family junior liens — — 145 145 17 Mortgage, multi-family — — 239 239 — Mortgage, commercial — — 1,195 1,195 — Loans to individuals — — — — — Foreclosed assets (5) — — — — — Total $ — $ — $ 26,689 $ 26,689 $ 59 (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. Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis (continued) December 31, 2016 Year Ended December 31, 2016 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 $ — $ — $ 10,773 $ 10,773 $ — Commercial and financial — — 1,397 1,397 143 Real Estate: Construction, 1 to 4 family residential — — 827 827 — Construction, land development and commercial — — 85 85 — Mortgage, farmland — — 7,077 7,077 — Mortgage, 1 to 4 family first liens — — 5,424 5,424 756 Mortgage, 1 to 4 family junior liens — — 194 194 — Mortgage, multi-family — — 244 244 — Mortgage, commercial — — 1,541 1,541 65 Loans to individuals — — — — — Foreclosed assets (5) — — 75 75 20 Total $ — $ — $ 27,637 $ 27,637 $ 984 (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.

Stock Repurchase Program

Stock Repurchase Program	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Stock Repurchase Program	Stock Repurchase Program On July 26, 2005, the Company’s Board of Directors authorized a program to repurchase up to a total of 1,500,000 shares of the Company’s common stock (the “2005 Stock Repurchase Program”). The Company’s Board of Directors has authorized the 2005 Stock Repurchase Program through December 31, 2018. The Company expects the purchases pursuant to the 2005 Stock Repurchase Program to be made from time to time in private transactions at a price equal to the most recent quarterly independent appraisal of the shares of the Company’s common stock and with the Board reviewing the overall results of the 2005 Stock Repurchase Program on a quarterly basis. All purchases made pursuant to the 2005 Stock Repurchase Program since its inception have been made on that basis. The amount and timing of stock repurchases will be based on various factors, such as the Board’s assessment of the Company’s capital structure and liquidity, the amount of interest shown by shareholders in selling shares of stock to the Company at their appraised value, and applicable regulatory, legal and accounting factors. The Company has purchased 972,297 shares of its common stock in privately negotiated transactions from August 1, 2005 through March 31, 2017 . Of these 972,297 shares, 9,346 shares were purchased during the quarter ended March 31, 2017 , at an average price per share of $49.78 .

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
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 $79.54 million . The concentrations of credit by type of loan are set forth in Note 5 to the Consolidated Financial Statements. Outstanding letters of credit were granted primarily to commercial borrowers. Although the Bank has a diversified loan portfolio, a substantial portion of its debtors' ability to honor their contracts is dependent upon the economic conditions in Johnson, Linn and Washington Counties, Iowa. Contingencies : In the normal course of business, the Company and Bank are involved in various legal proceedings. 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 condition or results of operations. 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 March 31, 2017 and December 31, 2016 is as follows: March 31, 2017 December 31, 2016 (Amounts In Thousands) Firm loan commitments and unused portion of lines of credit: Home equity loans $ 51,362 $ 48,785 Credit cards 47,168 45,738 Commercial, real estate and home construction 147,200 113,251 Commercial lines and real estate purchase loans 187,213 180,892 Outstanding letters of credit 8,885 9,024

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Federal income tax expense for the three months ended March 31, 2017 and 2016 was computed using the consolidated effective federal tax rate. The Company also recognized income tax expense pertaining to state franchise taxes payable individually by the subsidiary bank. The Company files a consolidated tax return for federal purposes and separate tax returns for State of Iowa purposes. The tax years ended December 31, 2016 , 2015 , and 2014 remain subject to examination by the Internal Revenue Service. For state tax purposes, the tax years ended December 31, 2016 , 2015 , and 2014 remain open for examination. There were no material unrecognized tax benefits at March 31, 2017 and December 31, 2016 and therefore no interest or penalties on unrecognized tax benefits has been recorded. As of March 31, 2017 , the Company does not anticipate any significant increase in unrecognized tax benefits during the twelve-month period ending March 31, 2018. Income taxes as a percentage of income before taxes were 30.89% for the three months ended March 31, 2017 and 29.65% for the same period in 2016 .

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2017
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 financial statement 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 $3.59 million of collateral as of March 31, 2017 . 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 March 31, 2017 and December 31, 2016 : Notional Amount Fair Value Balance Sheet Category Maturity (Amounts in Thousands) March 31, 2017 Interest rate swap $ 25,000 $ (948 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,641 ) Other Liabilities 11/7/2023 December 31, 2016 Interest rate swap $ 25,000 $ (1,097 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,841 ) 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 as of March 31, 2017 and December 31, 2016 : Effective Portion Ineffective Portion Recognized in OCI Reclassifed 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) March 31, 2017 Interest rate swap $ 92 Interest Expense $ — Other Income $ — Interest rate swap 124 Interest Expense — Other Income — December 31, 2016 Interest rate swap $ 250 Interest Expense $ — Other Income $ — Interest rate swap (101 ) Interest Expense — Other Income —

Summary of Significant Accoun19

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation: The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial reporting and with instructions for Form 10-Q and Regulation S-X. These financial statements include all adjustments (consisting of normal recurring accruals) which in the opinion of management are considered necessary for the fair presentation of the financial position and results of operations for the periods shown. Certain prior year amounts have been reclassified to conform to the current year presentation. The Company considers that it operates as one business segment, a commercial bank.
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 good 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. For financial institutions, significant changes are not expected given that most financial instruments are not in the scope of the accounting standard update. ASU 2014-09 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. In August 2015, FASB issued ASU 2015-14 deferring the effective date for annual periods and interim periods within those annual periods after December 15, 2017. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. The Company is in the process of evaluating its noninterest income streams and how they might be impacted by the new guidance. The adoption of ASU 2014-09 by the Company is not expected to have a material impact. 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 adoption of ASU 2016-01 by the Company is not expected to have a material impact. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases . The ASU provides guidance requiring lessees to recognize right-of-use 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 adoption of ASU 2016-02 by the Company is not expected to have a material impact. 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 adoption of ASU 2016-04 by the Company is not expected to have a material impact. In March 2016, the FASB issued ASU No. 2016-09, Compensation - Stock Compensation (Topic 718), Improvements to Employee Share-Based Payment Accounting . The ASU simplifies several aspects of the accounting for share-based payment transaction, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For public companies, ASU 2016-09 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. The Company adopted ASU 2016-09 for the period ending March 31, 2017. 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. We are currently evaluating the impact the CECL model will have on our accounting, but we expect to recognize a one-time cumulative-effect adjustment to our allowance for loan losses as of the beginning of the first reporting period in which the new standard is effective. 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 permitting a company to perform its annual or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized when the carrying amount exceeds fair value. For public companies, ASU 2017-04 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The adoption of ASU No. 2017-04 by the Company is not expected to have a material impact. In March 2017, the FASB issued ASU No. 2017-08, Receivable - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities. This ASU shortens the amortization period for certain callable debt securities held at a premium. The premium will be amortized to the earliest call date. For public companies, ASU 2017-08 is effective for fiscal years, and interim periods within those fiscal years beginning after December 15, 2018.
Earnings Per Share	Earnings Per Share Basic earnings per share is computed using the weighted average number of actual common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that would occur from the exercise of common stock options outstanding. ESOP shares are considered outstanding for this calculation unless unearned.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Schedule of computation of basic and diluted earnings per share	The computation of basic and diluted earnings per share for the periods presented is as follows: Three Months Ended March 31, 2017 2016 Common shares outstanding at the beginning of the period 9,264,227 9,322,054 Weighted average number of net shares issued (redeemed) 61,124 (14,370 ) Weighted average shares outstanding (basic) 9,325,351 9,307,684 Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method 6,190 6,130 Weighted average number of shares (diluted) 9,331,541 9,313,814 Net income (In thousands) $ 8,874 $ 7,700 Earnings per share: Basic $ 0.95 $ 0.83 Diluted $ 0.95 $ 0.83

Other Comprehensive Income (L21

Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Components of accumulated other comprehensive income (AOCI)	The following table summarizes the balances of each component of accumulated other comprehensive income (AOCI), included in stockholders’ equity, at March 31, 2017 and December 31, 2016 : March 31, December 31, 2016 (amounts in thousands) Net unrealized loss on available-for-sale securities $ (129 ) $ (1,502 ) Net unrealized loss on derivatives used for cash flow hedges (3,589 ) (3,938 ) Tax effect $ 1,422 $ 2,081 Net-of-tax amount $ (2,296 ) $ (3,359 )

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Carrying values of investment securities	The carrying values of investment securities at March 31, 2017 and December 31, 2016 are summarized in the following table (dollars in thousands): March 31, 2017 December 31, 2016 Amount Percent Amount Percent Securities available for sale U.S. Treasury $ 32,389 11.85 % $ 27,482 10.27 % Other securities (FHLB, FHLMC and FNMA) 57,744 21.12 61,660 23.05 State and political subdivisions 183,276 67.03 178,395 66.68 Total securities available for sale $ 273,409 100.00 % $ 267,537 100.00 %
Carrying amount of available-for-sale securities and approximate fair values	The carrying amount of available-for-sale securities and their approximate fair values were as follows as of March 31, 2017 and December 31, 2016 (in thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value March 31, 2017: U.S. Treasury $ 32,320 $ 80 $ (11 ) $ 32,389 Other securities (FHLB, FHLMC and FNMA) 58,029 45 (330 ) 57,744 State and political subdivisions 183,189 1,020 (933 ) 183,276 Total $ 273,538 $ 1,145 $ (1,274 ) $ 273,409 December 31, 2016: U.S. Treasury $ 27,418 $ 82 $ (18 ) $ 27,482 Other securities (FHLB, FHLMC and FNMA) 62,047 65 (452 ) 61,660 State and political subdivisions 179,574 626 (1,805 ) 178,395 Total $ 269,039 $ 773 $ (2,275 ) $ 267,537
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 March 31, 2017 , were as follows (in thousands): Amortized Cost Fair Value Due in one year or less $ 54,197 $ 54,263 Due after one year through five years 144,824 145,067 Due after five years through ten years 73,442 73,007 Due over ten years 1,075 1,072 Total $ 273,538 $ 273,409
Available-for-sale securities, continuous unrealized loss position, fair value	The following table shows the fair value, gross unrealized losses and the percentage of fair value represented by gross unrealized losses of applicable investment securities owned by the Company, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at March 31, 2017 and December 31, 2016 (in thousands): Less than 12 months 12 months or more Total March 31, 2017 # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % U.S. Treasury 2 $ 4,937 $ (11 ) 0.22 % — $ — $ — — % 2 $ 4,937 $ (11 ) 0.22 % Other securities (FHLB, FHLMC and FNMA) 12 29,741 (330 ) 1.11 — — — — 12 29,741 (330 ) 1.11 State and political subdivisions 237 57,946 (904 ) 1.56 11 1,500 (29 ) 1.93 248 59,446 (933 ) 1.57 Total temporarily impaired securities 251 $ 92,624 $ (1,245 ) 1.34 % 11 $ 1,500 $ (29 ) 1.93 % 262 $ 94,124 $ (1,274 ) 1.35 % Less than 12 months 12 months or more Total December 31, 2016 # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % U.S. Treasury 2 $ 4,957 $ (18 ) 0.36 % — $ — $ — — % 2 $ 4,957 $ (18 ) 0.36 % Other securities (FHLB, FHLMC and FNMA) 14 34,648 (452 ) 1.30 — — — — 14 34,648 (452 ) 1.30 State and political subdivisions 365 87,841 (1,762 ) 2.01 11 1,486 (43 ) 2.89 376 89,327 (1,805 ) 2.02 Total temporarily impaired securities 381 $ 127,446 $ (2,232 ) 1.75 % 11 $ 1,486 $ (43 ) 2.89 % 392 $ 128,932 $ (2,275 ) 1.76 %

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Schedule of classes of loans	Classes of loans are as follows: March 31, December 31, (Amounts In Thousands) Agricultural $ 87,934 $ 92,871 Commercial and financial 199,702 192,995 Real estate: Construction, 1 to 4 family residential 63,784 57,864 Construction, land development and commercial 125,144 121,561 Mortgage, farmland 205,334 202,340 Mortgage, 1 to 4 family first liens 780,407 767,469 Mortgage, 1 to 4 family junior liens 127,721 125,400 Mortgage, multi-family 303,653 302,831 Mortgage, commercial 334,067 334,198 Loans to individuals 24,710 25,157 Obligations of state and political subdivisions 54,709 54,462 $ 2,307,165 $ 2,277,148 Net unamortized fees and costs 826 827 $ 2,307,991 $ 2,277,975 Less allowance for loan losses 26,450 26,530 $ 2,281,541 $ 2,251,445
Schedule of changes in allowance for loan losses	Changes in the allowance for loan losses, the allowance for loan losses applicable to impaired loans and the related loan balance of impaired loans for the three months ended March 31, 2017 were as follows: Three Months Ended March 31, 2017 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) Allowance for loan losses: Beginning balance $ 2,947 $ 4,531 $ 2,890 $ 3,417 $ 7,677 $ 4,045 $ 1,023 $ 26,530 Charge-offs — (220 ) — — (145 ) — (188 ) (553 ) Recoveries 38 454 381 — 133 180 101 1,287 Provision (480 ) (866 ) (177 ) 90 507 133 (21 ) (814 ) Ending balance $ 2,505 $ 3,899 $ 3,094 $ 3,507 $ 8,172 $ 4,358 $ 915 $ 26,450 Ending balance, individually evaluated for impairment $ 587 $ 144 $ 72 $ 345 $ 62 $ 15 $ 36 $ 1,261 Ending balance, collectively evaluated for impairment $ 1,918 $ 3,755 $ 3,022 $ 3,162 $ 8,110 $ 4,343 $ 879 $ 25,189 Loans: Ending balance $ 87,934 $ 199,702 $ 188,928 $ 205,334 $ 908,128 $ 637,720 $ 79,419 $ 2,307,165 Ending balance, individually evaluated for impairment $ 11,388 $ 1,787 $ 671 $ 8,502 $ 5,521 $ 2,034 $ 36 $ 29,939 Ending balance, collectively evaluated for impairment $ 76,546 $ 197,915 $ 188,257 $ 196,832 $ 902,607 $ 635,686 $ 79,383 $ 2,277,226 Changes in the allowance for loan losses for the three months ended March 31, 2016 were as follows: Three Months Ended March 31, 2016 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) Allowance for loan losses: Beginning balance $ 3,082 $ 4,517 $ 2,280 $ 3,342 $ 8,172 $ 4,223 $ 894 $ 26,510 Charge-offs — (55 ) — (10 ) (344 ) (66 ) (169 ) (644 ) Recoveries 142 253 52 — 213 11 44 715 Provision (270 ) (404 ) 427 612 (5 ) 22 167 549 Ending balance $ 2,954 $ 4,311 $ 2,759 $ 3,944 $ 8,036 $ 4,190 $ 936 $ 27,130 Ending balance, individually evaluated for impairment $ 868 $ 268 $ 32 $ 670 $ 310 $ 88 $ 22 $ 2,258 Ending balance, collectively evaluated for impairment $ 2,086 $ 4,043 $ 2,727 $ 3,274 $ 7,726 $ 4,102 $ 914 $ 24,872 Loans: Ending balance $ 90,620 $ 173,736 $ 163,900 $ 189,882 $ 844,039 $ 600,680 $ 74,582 $ 2,137,439 Ending balance, individually evaluated for impairment $ 12,647 $ 2,406 $ 1,450 $ 8,098 $ 5,594 $ 3,649 $ 22 $ 33,866 Ending balance, collectively evaluated for impairment $ 77,973 $ 171,330 $ 162,450 $ 181,784 $ 838,445 $ 597,031 $ 74,560 $ 2,103,573
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 March 31, 2017 and December 31, 2016 , respectively (amounts in thousands): Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial March 31, 2017 Grade: Excellent $ 3,256 $ 9,520 $ — $ 635 Good 14,292 38,506 5,753 22,777 Satisfactory 37,290 115,447 45,876 51,858 Monitor 15,562 25,704 9,256 45,207 Special Mention 4,372 6,328 1,311 4,215 Substandard 13,162 4,197 1,588 452 Total $ 87,934 $ 199,702 $ 63,784 $ 125,144 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 March 31, 2017 Grade: Excellent $ 2,829 $ 1,183 $ 130 $ 5,882 Good 49,476 15,354 3,342 72,006 Satisfactory 104,287 659,704 115,372 182,985 Monitor 36,334 68,035 4,891 38,867 Special Mention 3,136 12,523 1,506 3,611 Substandard 9,272 23,608 2,480 302 Total $ 205,334 $ 780,407 $ 127,721 $ 303,653 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total March 31, 2017 Grade: Excellent $ 15,424 $ — $ — $ 38,859 Good 89,922 97 34,395 345,920 Satisfactory 186,099 23,903 17,160 1,539,981 Monitor 34,981 340 3,154 282,331 Special Mention 3,925 193 — 41,120 Substandard 3,716 177 — 58,954 Total $ 334,067 $ 24,710 $ 54,709 $ 2,307,165 Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial December 31, 2016 Grade: Excellent $ 4,205 $ 4,241 $ — $ 244 Good 13,611 43,472 1,701 25,337 Satisfactory 40,008 108,800 44,138 46,758 Monitor 12,699 20,023 8,896 44,487 Special Mention 8,381 11,177 972 4,250 Substandard 13,967 5,282 2,157 485 Total $ 92,871 $ 192,995 $ 57,864 $ 121,561 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 December 31, 2016 Grade: Excellent $ 2,916 $ 1,196 $ 65 $ 5,970 Good 47,569 15,725 3,002 71,822 Satisfactory 105,971 647,191 113,433 180,651 Monitor 29,778 66,164 4,877 40,444 Special Mention 7,004 12,914 1,566 3,636 Substandard 9,102 24,279 2,457 308 Total $ 202,340 $ 767,469 $ 125,400 $ 302,831 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total December 31, 2016 Grade: Excellent $ 15,873 $ — $ — $ 34,710 Good 89,801 65 37,539 349,644 Satisfactory 185,650 24,446 16,417 1,513,463 Monitor 34,979 293 506 263,146 Special Mention 3,797 195 — 53,892 Substandard 4,098 158 — 62,293 Total $ 334,198 $ 25,157 $ 54,462 $ 2,277,148
Schedule of past due loans	Past due loans as of March 31, 2017 and December 31, 2016 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) March 31, 2017 Agricultural $ 293 $ — $ 81 $ 374 $ 87,560 $ 87,934 $ — Commercial and financial 1,350 547 120 2,017 197,685 199,702 — Real estate: Construction, 1 to 4 family residential 1,411 — — 1,411 62,373 63,784 — Construction, land development and commercial 679 — 60 739 124,405 125,144 60 Mortgage, farmland 586 — — 586 204,748 205,334 — Mortgage, 1 to 4 family first liens 3,761 694 1,680 6,135 774,272 780,407 221 Mortgage, 1 to 4 family junior liens 132 21 136 289 127,432 127,721 — Mortgage, multi-family 4,354 — 40 4,394 299,259 303,653 — Mortgage, commercial 694 16 163 873 333,194 334,067 — Loans to individuals 97 9 — 106 24,604 24,710 — Obligations of state and political subdivisions — — — — 54,709 54,709 — $ 13,357 $ 1,287 $ 2,280 $ 16,924 $ 2,290,241 $ 2,307,165 $ 281 December 31, 2016 Agricultural $ 56 $ — $ 302 $ 358 $ 92,513 $ 92,871 $ — Commercial and financial 24 121 718 863 192,132 192,995 — Real estate: Construction, 1 to 4 family residential — — — — 57,864 57,864 — Construction, land development and commercial — 231 85 316 $ 121,245 121,561 — Mortgage, farmland 319 — — 319 202,021 202,340 — Mortgage, 1 to 4 family first liens 5,649 978 1,943 8,570 $ 758,899 767,469 192 Mortgage, 1 to 4 family junior liens 330 51 579 960 124,440 125,400 443 Mortgage, multi-family — — 40 40 $ 302,791 302,831 — Mortgage, commercial 371 — 207 578 333,620 334,198 — Loans to individuals 203 32 — 235 $ 24,922 25,157 — Obligations of state and political subdivisions — — — — 54,462 54,462 — $ 6,952 $ 1,413 $ 3,874 $ 12,239 $ 2,264,909 $ 2,277,148 $ 635
Schedule of impaired loan information	Certain impaired loan information by loan type at March 31, 2017 and December 31, 2016 , was as follows: March 31, 2017 December 31, 2016 Non-accrual loans (1) Accruing loans past due 90 days or more TDR loans Non- accrual loans (1) Accruing loans past due 90 days or more TDR loans (Amounts In Thousands) (Amounts In Thousands) Agricultural $ 1,528 $ — $ 7,212 $ 1,741 $ — $ 91 Commercial and financial 1,278 — 509 1,354 — 1,057 Real estate: Construction, 1 to 4 family residential — — 265 — — 265 Construction, land development and commercial — 60 346 85 — 118 Mortgage, farmland 1,410 — 1,662 1,205 — 1,389 Mortgage, 1 to 4 family first liens 3,921 221 1,362 4,097 192 1,375 Mortgage, 1 to 4 family junior liens 149 — 26 136 443 26 Mortgage, multi-family 239 — — 243 — — Mortgage, commercial 719 — 1,075 1,077 — 1,087 $ 9,244 $ 281 $ 12,457 $ 9,938 $ 635 $ 5,408 (1) There were $4.17 million and $4.23 million of TDR loans included within nonaccrual loans as of March 31, 2017 and December 31, 2016 , respectively.
Schedule of information for TDR loans	Below is a summary of information for TDR loans as of March 31, 2017 and December 31, 2016 : March 31, 2017 December 31, 2016 Number of contracts Recorded investment Commitments outstanding Number of contracts Recorded investment Commitments outstanding (Amounts In Thousands) (Amounts In Thousands) Agricultural 7 $ 8,596 $ 143 4 $ 1,460 $ 167 Commercial and financial 11 1,426 551 14 2,053 117 Real estate: Construction, 1 to 4 family residential 3 265 119 3 265 1,225 Construction, land development and commercial 2 346 6 1 118 107 Mortgage, farmland 8 3,073 — 7 2,594 — Mortgage, 1 to 4 family first liens 12 1,454 — 12 1,471 — Mortgage, 1 to 4 family junior liens 1 26 16 1 26 65 Mortgage, multi-family — — — — — — Mortgage, commercial 8 1,440 — 10 1,650 — Loans to individuals — — — — — — 52 $ 16,626 $ 835 52 $ 9,637 $ 1,681 The following is a summary of TDR loans that were modified during the three months ended March 31, 2017 : Three Months Ended March 31, 2017 Number of contracts Pre-modification recorded investment Post-modification recorded investment (Amounts In Thousands) Agricultural 3 $ 8,783 $ 8,783 Commercial and financial — — — Real estate: Construction, 1 to 4 family residential — — — Construction, land development and commercial 1 231 231 Mortgage, farmland 2 598 598 Mortgage, 1 to 4 family first lien — — — Mortgage, 1 to 4 family junior liens — — — Mortgage, multi-family — — — Mortgage, commercial — — — 6 $ 9,612 $ 9,612
Schedule of impaired loans	Information regarding impaired loans as of and for the three months ended March 31, 2017 is as follows: March 31, 2017 Three Months Ended Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: (Amounts In Thousands) Agricultural $ 1,528 $ 1,748 $ — $ 1,524 $ — Commercial and financial 1,531 2,163 — 1,555 5 Real estate: Construction, 1 to 4 family residential 117 151 — 117 1 Construction, land development and commercial 117 167 — 118 1 Mortgage, farmland 2,753 3,062 — 2,636 16 Mortgage, 1 to 4 family first liens 4,682 5,796 — 4,726 13 Mortgage, 1 to 4 family junior liens 149 645 — 151 — Mortgage, multi-family 239 361 — 241 — Mortgage, commercial 1,700 2,283 — 1,722 11 Loans to individuals — 18 — — — $ 12,816 $ 16,394 $ — $ 12,790 $ 47 With an allowance recorded: Agricultural $ 9,860 $ 9,860 $ 587 $ 9,967 $ 111 Commercial and financial 256 275 144 272 1 Real estate: Construction, 1 to 4 family residential 289 289 32 290 3 Construction, land development and commercial 148 148 40 148 2 Mortgage, farmland 5,749 5,749 345 5,751 61 Mortgage, 1 to 4 family first liens 664 703 59 684 4 Mortgage, 1 to 4 family junior liens 26 26 3 26 1 Mortgage, multi-family — — — — — Mortgage, commercial 95 97 15 97 1 Loans to individuals 36 36 36 33 1 $ 17,123 $ 17,183 $ 1,261 $ 17,268 $ 185 Total: Agricultural $ 11,388 $ 11,608 $ 587 $ 11,491 $ 111 Commercial and financial 1,787 2,438 144 1,827 6 Real estate: Construction, 1 to 4 family residential 406 440 32 407 4 Construction, land development and commercial 265 315 40 266 3 Mortgage, farmland 8,502 8,811 345 8,387 77 Mortgage, 1 to 4 family first liens 5,346 6,499 59 5,410 17 Mortgage, 1 to 4 family junior liens 175 671 3 177 1 Mortgage, multi-family 239 361 — 241 — Mortgage, commercial 1,795 2,380 15 1,819 12 Loans to individuals 36 54 36 33 1 $ 29,939 $ 33,577 $ 1,261 $ 30,058 $ 232 Information regarding impaired loans as of December 31, 2016 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance With no related allowance recorded: (Amounts In Thousands) Agricultural $ 800 $ 971 $ — Commercial and financial 1,540 2,175 — Real estate: Construction, 1 to 4 family residential 117 151 — Construction, land development and commercial 204 290 — Mortgage, farmland 2,594 2,887 — Mortgage, 1 to 4 family first liens 5,011 6,137 — Mortgage, 1 to 4 family junior liens 153 646 — Mortgage, multi-family 243 362 — Mortgage, commercial 1,901 2,727 — Loans to individuals — 19 — $ 12,563 $ 16,365 $ — With an allowance recorded: Agricultural $ 10,920 $ 10,978 $ 856 Commercial and financial 937 955 718 Real estate: Construction, 1 to 4 family residential 815 815 105 Construction, land development and commercial — — — Mortgage, farmland 5,434 5,434 390 Mortgage, 1 to 4 family first liens 1,266 1,374 79 Mortgage, 1 to 4 family junior liens 612 667 11 Mortgage, multi-family — — — Mortgage, commercial 967 1,004 34 Loans to individuals 150 150 150 $ 21,101 $ 21,377 $ 2,343 Total: Agricultural $ 11,720 $ 11,949 $ 856 Commercial and financial 2,477 3,130 718 Real estate: Construction, 1 to 4 family residential 932 966 105 Construction, land development and commercial 204 290 — Mortgage, farmland 8,028 8,321 390 Mortgage, 1 to 4 family first liens 6,277 7,511 79 Mortgage, 1 to 4 family junior liens 765 1,313 11 Mortgage, multi-family 243 362 — Mortgage, commercial 2,868 3,731 34 Loans to individuals 150 169 150 $ 33,664 $ 37,742 $ 2,343

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017 are as follows: March 31, 2017 Carrying Amount Estimated Fair Value Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) (Amounts In Thousands) Financial instrument assets: Cash and cash equivalents $ 151,273 $ 151,273 $ 151,273 $ — $ — Investment securities 286,016 286,016 — 286,016 — Loans held for sale 1,656 1,656 — 1,656 — Loans Agricultural 85,429 85,394 — — 85,394 Commercial and financial 195,803 195,651 — — 195,651 Real estate: Construction, 1 to 4 family residential 62,689 62,706 — — 62,706 Construction, land development and commercial 123,145 123,029 — — 123,029 Mortgage, farmland 201,827 201,988 — — 201,988 Mortgage, 1 to 4 family first liens 773,417 767,495 — — 767,495 Mortgage, 1 to 4 family junior liens 126,539 131,430 — — 131,430 Mortgage, multi-family 301,827 298,276 — — 298,276 Mortgage, commercial 331,535 328,530 — — 328,530 Loans to individuals 24,205 24,188 — — 24,188 Obligations of state and political subdivisions 54,299 53,115 — — 53,115 Accrued interest receivable 10,286 10,286 — 10,286 — Total financial instrument assets $ 2,729,946 $ 2,721,033 $ 151,273 $ 297,958 $ 2,271,802 Financial instrument liabilities Deposits Noninterest-bearing deposits $ 339,867 $ 339,867 $ — $ 339,867 $ — Interest-bearing deposits 1,833,465 1,837,543 — 1,837,543 — Other borrowings 28,086 28,086 — 28,086 — Federal Home Loan Bank borrowings 235,000 228,318 — 228,318 — Interest rate swaps 3,589 3,589 — 3,589 — Accrued interest payable 940 940 — 940 — Total financial instrument liabilities $ 2,440,947 $ 2,438,343 $ — $ 2,438,343 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 432,943 $ — $ — $ — $ — Letters of credit 8,885 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 441,828 $ — $ — $ — $ — (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, 2016 are as follows: December 31, 2016 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 $ 38,197 $ 38,197 $ 38,197 $ — $ — Investment securities 279,950 279,950 — 279,950 — Loans held for sale 9,806 9,806 — 9,806 — Loans Agricultural 89,924 89,862 — — 89,862 Commercial and financial 188,464 188,292 — — 188,292 Real estate: Construction, 1 to 4 family residential 56,841 56,715 — — 56,715 Construction, land development and commercial 119,694 119,716 — — 119,716 Mortgage, farmland 198,923 199,043 — — 199,043 Mortgage, 1 to 4 family first liens 760,909 764,174 — — 764,174 Mortgage, 1 to 4 family junior liens 124,283 129,339 — — 129,339 Mortgage, multi-family 301,162 297,646 — — 297,646 Mortgage, commercial 331,822 328,948 — — 328,948 Loans to individuals 24,515 24,499 — — 24,499 Obligations of state and political subdivisions 54,081 52,860 — — 52,860 Accrued interest receivable 9,121 9,121 — 9,121 — Total financial instrument assets $ 2,587,692 $ 2,588,168 $ 38,197 $ 298,877 $ 2,251,094 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 348,505 $ 348,505 $ — $ 348,505 $ — Interest-bearing deposits 1,687,807 1,691,679 — 1,691,679 — Other borrowings 33,489 33,489 — 33,489 — Federal Home Loan Bank borrowings 235,000 231,232 — 231,232 — Interest rate swaps 3,938 3,938 3,938 Accrued interest payable 984 984 — 984 — Total financial instrument liabilities $ 2,309,723 $ 2,309,827 $ — $ 2,309,827 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 388,666 $ — $ — $ — $ — Letters of credit 9,024 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 397,690 $ — $ — $ — $ — (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 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: March 31, 2017 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Securities available for sale (Amounts In Thousands) U.S. Treasury $ — $ 32,389 $ — $ 32,389 State and political subdivisions — 57,744 — 57,744 Other securities (FHLB, FHLMC and FNMA) — 183,276 — 183,276 Derivative Financial Instruments Interest rate swaps $ — (3,589 ) $ — (3,589 ) Total $ — $ 269,820 $ — $ 269,820 December 31, 2016 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 $ — $ 27,482 $ — $ 27,482 State and political subdivisions — 178,395 — 178,395 Other securities (FHLB, FHLMC and FNMA) — 61,660 — 61,660 Derivative Financial Instruments Interest rate swaps — (3,938 ) — (3,938 ) Total $ — $ 263,599 $ — $ 263,599 (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	The following tables present the Company’s assets that are measured at fair value on a nonrecurring basis. March 31, 2017 Three Months Ended March 31, 2017 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 10,714 $ 10,714 $ — Commercial and financial — — 1,383 1,383 — Real Estate: Construction, 1 to 4 family residential — — 224 224 — Construction, land development and commercial — — 197 197 — Mortgage, farmland — — 7,624 7,624 — Mortgage, 1 to 4 family first liens — — 4,968 4,968 42 Mortgage, 1 to 4 family junior liens — — 145 145 17 Mortgage, multi-family — — 239 239 — Mortgage, commercial — — 1,195 1,195 — Loans to individuals — — — — — Foreclosed assets (5) — — — — — Total $ — $ — $ 26,689 $ 26,689 $ 59 (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. Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis (continued) December 31, 2016 Year Ended December 31, 2016 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 $ — $ — $ 10,773 $ 10,773 $ — Commercial and financial — — 1,397 1,397 143 Real Estate: Construction, 1 to 4 family residential — — 827 827 — Construction, land development and commercial — — 85 85 — Mortgage, farmland — — 7,077 7,077 — Mortgage, 1 to 4 family first liens — — 5,424 5,424 756 Mortgage, 1 to 4 family junior liens — — 194 194 — Mortgage, multi-family — — 244 244 — Mortgage, commercial — — 1,541 1,541 65 Loans to individuals — — — — — Foreclosed assets (5) — — 75 75 20 Total $ — $ — $ 27,637 $ 27,637 $ 984 (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.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of banks commitments	A summary of the Bank’s commitments at March 31, 2017 and December 31, 2016 is as follows: March 31, 2017 December 31, 2016 (Amounts In Thousands) Firm loan commitments and unused portion of lines of credit: Home equity loans $ 51,362 $ 48,785 Credit cards 47,168 45,738 Commercial, real estate and home construction 147,200 113,251 Commercial lines and real estate purchase loans 187,213 180,892 Outstanding letters of credit 8,885 9,024

Derivative Financial Instrume26

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2017
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 March 31, 2017 and December 31, 2016 : Notional Amount Fair Value Balance Sheet Category Maturity (Amounts in Thousands) March 31, 2017 Interest rate swap $ 25,000 $ (948 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,641 ) Other Liabilities 11/7/2023 December 31, 2016 Interest rate swap $ 25,000 $ (1,097 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,841 ) 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 as of March 31, 2017 and December 31, 2016 : Effective Portion Ineffective Portion Recognized in OCI Reclassifed 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) March 31, 2017 Interest rate swap $ 92 Interest Expense $ — Other Income $ — Interest rate swap 124 Interest Expense — Other Income — December 31, 2016 Interest rate swap $ 250 Interest Expense $ — Other Income $ — Interest rate swap (101 ) Interest Expense — Other Income —

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2017segment
Accounting Policies [Abstract]
Number of operating segments	1

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Summary of computation of basic and diluted earnings per share [Abstract]
Common shares outstanding at the beginning of the period (shares)			9,264,227	9,322,054
Weighted average number of net shares issued (redeemed) (shares)	61,124	(14,370)
Weighted average shares outstanding (basic) (shares)	9,325,351	9,307,684
Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method (shares)	6,190	6,130
Weighted average number of shares (diluted) (shares)	9,331,541	9,313,814
Net income (In thousands)	$ 8,874	$ 7,700
Earnings per share:
Basic (in dollars per share)	$ 0.95	$ 0.83
Diluted (in dollars per share)	$ 0.95	$ 0.83

Other Comprehensive Income (L29

Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Tax effect	$ 1,422	$ 2,081
Net-of-tax amount	(2,296)	(3,359)
Net unrealized loss on available-for-sale securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain (loss)	(129)	(1,502)
Net unrealized loss on derivatives used for cash flow hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gain (loss)	$ (3,589)	$ (3,938)

Securities (Details)

Securities (Details) $ in Thousands	Mar. 31, 2017USD ($)security	Dec. 31, 2016USD ($)security
Securities available for sale
Securities available for sale	$ 273,409	$ 267,537
Securities available for sale, Percent	100.00%	100.00%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 273,538	$ 269,039
Gross Unrealized Gains	1,145	773
Gross Unrealized (Losses)	(1,274)	(2,275)
Estimated Fair Value	273,409	267,537
Amortized Cost
Due in one year or less	54,197
Due after one year through five years	144,824
Due after five years through ten years	73,442
Due over ten years	1,075
Amortized Cost	273,538
Fair Value
Due in one year or less	54,263
Due after one year through five years	145,067
Due after five years through ten years	73,007
Due over ten years	1,072
Fair Value	273,409	$ 267,537
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 45,510
Less than 12 months
Number of securities | security	251	381
Fair Value	$ 92,624	$ 127,446
Unrealized Loss	$ (1,245)	$ (2,232)
Percentage	1.34%	1.75%
12 months or more
Number of securities | security	11	11
Fair Value	$ 1,500	$ 1,486
Unrealized Loss	$ (29)	$ (43)
Percentage	1.93%	2.89%
Total
Number of securities | security	262	392
Fair Value	$ 94,124	$ 128,932
Unrealized Loss	$ (1,274)	$ (2,275)
Percentage	1.35%	1.76%
U.S. Treasury [Member]
Securities available for sale
Securities available for sale	$ 32,389	$ 27,482
Securities available for sale, Percent	11.85%	10.27%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 32,320	$ 27,418
Gross Unrealized Gains	80	82
Gross Unrealized (Losses)	(11)	(18)
Estimated Fair Value	32,389	27,482
Fair Value
Fair Value	$ 32,389	$ 27,482
Less than 12 months
Number of securities | security	2	2
Fair Value	$ 4,937	$ 4,957
Unrealized Loss	$ (11)	$ (18)
Percentage	0.22%	0.36%
12 months or more
Number of securities | security	0	0
Fair Value	$ 0	$ 0
Unrealized Loss	$ 0	$ 0
Percentage	0.00%	0.00%
Total
Number of securities | security	2	2
Fair Value	$ 4,937	$ 4,957
Unrealized Loss	$ (11)	$ (18)
Percentage	0.22%	0.36%
Other securities (FHLB, FHLMC and FNMA) [Member]
Securities available for sale
Securities available for sale	$ 57,744	$ 61,660
Securities available for sale, Percent	21.12%	23.05%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 58,029	$ 62,047
Gross Unrealized Gains	45	65
Gross Unrealized (Losses)	(330)	(452)
Estimated Fair Value	57,744	61,660
Fair Value
Fair Value	$ 57,744	$ 61,660
Less than 12 months
Number of securities | security	12	14
Fair Value	$ 29,741	$ 34,648
Unrealized Loss	$ (330)	$ (452)
Percentage	1.11%	1.30%
12 months or more
Number of securities | security	0	0
Fair Value	$ 0	$ 0
Unrealized Loss	$ 0	$ 0
Percentage	0.00%	0.00%
Total
Number of securities | security	12	14
Fair Value	$ 29,741	$ 34,648
Unrealized Loss	$ (330)	$ (452)
Percentage	1.11%	1.30%
State and political subdivisions [Member]
Securities available for sale
Securities available for sale	$ 183,276	$ 178,395
Securities available for sale, Percent	67.03%	66.68%
Available-for-sale Securities Reconciliation [Abstract]
Amortized Cost	$ 183,189	$ 179,574
Gross Unrealized Gains	1,020	626
Gross Unrealized (Losses)	(933)	(1,805)
Estimated Fair Value	183,276	178,395
Fair Value
Fair Value	$ 183,276	$ 178,395
Less than 12 months
Number of securities | security	237	365
Fair Value	$ 57,946	$ 87,841
Unrealized Loss	$ (904)	$ (1,762)
Percentage	1.56%	2.01%
12 months or more
Number of securities | security	11	11
Fair Value	$ 1,500	$ 1,486
Unrealized Loss	$ (29)	$ (43)
Percentage	1.93%	2.89%
Total
Number of securities | security	248	376
Fair Value	$ 59,446	$ 89,327
Unrealized Loss	$ (933)	$ (1,805)
Percentage	1.57%	2.02%

Loans (Details)

Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Summary of classes of loans (abstract)
Loans and receivable	$ 2,307,165	$ 2,277,148	$ 2,137,439
Net unamortized fees and costs	826	827
Loans and receivable, gross	2,307,991	2,277,975
Less allowance for loan losses	26,450	26,530
Loans and receivable, net	2,281,541	2,251,445
Agricultural [Member]
Summary of classes of loans (abstract)
Loans and receivable	87,934	92,871	90,620
Commercial and financial [Member]
Summary of classes of loans (abstract)
Loans and receivable	199,702	192,995	173,736
Real Estate: Construction, 1 to 4 family residential [Member]
Summary of classes of loans (abstract)
Loans and receivable	63,784	57,864
Real Estate: Construction, land development and commercial [Member]
Summary of classes of loans (abstract)
Loans and receivable	125,144	121,561
Real Estate: Mortgage, farmland [Member]
Summary of classes of loans (abstract)
Loans and receivable	205,334	202,340	$ 189,882
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of classes of loans (abstract)
Loans and receivable	780,407	767,469
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of classes of loans (abstract)
Loans and receivable	127,721	125,400
Real Estate: Mortgage, multi-family [Member]
Summary of classes of loans (abstract)
Loans and receivable	303,653	302,831
Real Estate: Mortgage, commercial [Member]
Summary of classes of loans (abstract)
Loans and receivable	334,067	334,198
Loans to individuals [Member]
Summary of classes of loans (abstract)
Loans and receivable	24,710	25,157
Obligations of state and political subdivisions [Member]
Summary of classes of loans (abstract)
Loans and receivable	$ 54,709	$ 54,462

Loans, Allowance For Credit Los

Loans, Allowance For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 26,530	$ 26,510
Charge-offs	(553)	(644)
Recoveries	1,287	715
Provision	(814)	549
Ending balance	26,530	26,510	$ 26,450	$ 26,530	$ 27,130
Ending balance, individually evaluated for impairment	1,261	2,258
Ending balance, collectively evaluated for impairment	25,189	24,872
Loan [Abstract]
Total Loans Receivable			2,307,165	2,277,148	2,137,439
Ending balance, individually evaluated for impairment	29,939	33,866
Ending balance, collectively evaluated for impairment	2,277,226	2,103,573
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,947	3,082
Charge-offs	0	0
Recoveries	38	142
Provision	(480)	(270)
Ending balance	2,947	3,082	2,505	2,947	2,954
Ending balance, individually evaluated for impairment	587	868
Ending balance, collectively evaluated for impairment	1,918	2,086
Loan [Abstract]
Total Loans Receivable			87,934	92,871	90,620
Ending balance, individually evaluated for impairment	11,388	12,647
Ending balance, collectively evaluated for impairment	76,546	77,973
Commercial and Financial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,531	4,517
Charge-offs	(220)	(55)
Recoveries	454	253
Provision	(866)	(404)
Ending balance	4,531	4,517	3,899	4,531	4,311
Ending balance, individually evaluated for impairment	144	268
Ending balance, collectively evaluated for impairment	3,755	4,043
Loan [Abstract]
Total Loans Receivable			199,702	192,995	173,736
Ending balance, individually evaluated for impairment	1,787	2,406
Ending balance, collectively evaluated for impairment	197,915	171,330
Real Estate: Construction and land development [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,890	2,280
Charge-offs	0	0
Recoveries	381	52
Provision	(177)	427
Ending balance	2,890	2,280	3,094	2,890	2,759
Ending balance, individually evaluated for impairment	72	32
Ending balance, collectively evaluated for impairment	3,022	2,727
Loan [Abstract]
Total Loans Receivable			188,928		163,900
Ending balance, individually evaluated for impairment	671	1,450
Ending balance, collectively evaluated for impairment	188,257	162,450
Real Estate: Mortgage, farmland [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	3,417	3,342
Charge-offs	0	(10)
Recoveries	0	0
Provision	90	612
Ending balance	3,417	3,342	3,507	3,417	3,944
Ending balance, individually evaluated for impairment	345	670
Ending balance, collectively evaluated for impairment	3,162	3,274
Loan [Abstract]
Total Loans Receivable			205,334	202,340	189,882
Ending balance, individually evaluated for impairment	8,502	8,098
Ending balance, collectively evaluated for impairment	196,832	181,784
Real Estate: Mortgage, 1 to 4 family [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	7,677	8,172
Charge-offs	(145)	(344)
Recoveries	133	213
Provision	507	(5)
Ending balance	7,677	8,172	8,172	7,677	8,036
Ending balance, individually evaluated for impairment	62	310
Ending balance, collectively evaluated for impairment	8,110	7,726
Loan [Abstract]
Total Loans Receivable			908,128		844,039
Ending balance, individually evaluated for impairment	5,521	5,594
Ending balance, collectively evaluated for impairment	902,607	838,445
Real Estate: Mortgage, multi-family and commercial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	4,045	4,223
Charge-offs	0	(66)
Recoveries	180	11
Provision	133	22
Ending balance	4,045	4,223	4,358	4,045	4,190
Ending balance, individually evaluated for impairment	15	88
Ending balance, collectively evaluated for impairment	4,343	4,102
Loan [Abstract]
Total Loans Receivable			637,720		600,680
Ending balance, individually evaluated for impairment	2,034	3,649
Ending balance, collectively evaluated for impairment	635,686	597,031
Others [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,023	894
Charge-offs	(188)	(169)
Recoveries	101	44
Provision	(21)	167
Ending balance	1,023	894	915	$ 1,023	936
Ending balance, individually evaluated for impairment	36	22
Ending balance, collectively evaluated for impairment	879	914
Loan [Abstract]
Total Loans Receivable			$ 79,419		$ 74,582
Ending balance, individually evaluated for impairment	36	22
Ending balance, collectively evaluated for impairment	$ 79,383	$ 74,560

Loans, Credit Quality Indicator

Loans, Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	$ 2,307,165	$ 2,277,148	$ 2,137,439
Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	38,859	34,710
Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	345,920	349,644
Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,539,981	1,513,463
Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	282,331	263,146
Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	41,120	53,892
Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	58,954	62,293
Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	87,934	92,871	90,620
Agricultural [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,256	4,205
Agricultural [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	14,292	13,611
Agricultural [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	37,290	40,008
Agricultural [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	15,562	12,699
Agricultural [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,372	8,381
Agricultural [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	13,162	13,967
Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	199,702	192,995	173,736
Commercial and Financial [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	9,520	4,241
Commercial and Financial [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	38,506	43,472
Commercial and Financial [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	115,447	108,800
Commercial and Financial [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	25,704	20,023
Commercial and Financial [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	6,328	11,177
Commercial and Financial [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,197	5,282
Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	63,784	57,864
Real Estate: Construction, 1 to 4 family residential [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Real Estate: Construction, 1 to 4 family residential [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	5,753	1,701
Real Estate: Construction, 1 to 4 family residential [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	45,876	44,138
Real Estate: Construction, 1 to 4 family residential [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	9,256	8,896
Real Estate: Construction, 1 to 4 family residential [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,311	972
Real Estate: Construction, 1 to 4 family residential [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,588	2,157
Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	125,144	121,561
Real Estate: Construction, land development and commercial [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	635	244
Real Estate: Construction, land development and commercial [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	22,777	25,337
Real Estate: Construction, land development and commercial [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	51,858	46,758
Real Estate: Construction, land development and commercial [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	45,207	44,487
Real Estate: Construction, land development and commercial [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,215	4,250
Real Estate: Construction, land development and commercial [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	452	485
Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	205,334	202,340	$ 189,882
Real Estate: Mortgage, farmland [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	2,829	2,916
Real Estate: Mortgage, farmland [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	49,476	47,569
Real Estate: Mortgage, farmland [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	104,287	105,971
Real Estate: Mortgage, farmland [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	36,334	29,778
Real Estate: Mortgage, farmland [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,136	7,004
Real Estate: Mortgage, farmland [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	9,272	9,102
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	780,407	767,469
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,183	1,196
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	15,354	15,725
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	659,704	647,191
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	68,035	66,164
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	12,523	12,914
Real Estate: Mortgage, 1 to 4 family first liens [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	23,608	24,279
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	127,721	125,400
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	130	65
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,342	3,002
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	115,372	113,433
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,891	4,877
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,506	1,566
Real Estate: Mortgage, 1 to 4 family junior liens [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	2,480	2,457
Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	303,653	302,831
Real Estate: Mortgage, multi-family [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	5,882	5,970
Real Estate: Mortgage, multi-family [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	72,006	71,822
Real Estate: Mortgage, multi-family [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	182,985	180,651
Real Estate: Mortgage, multi-family [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	38,867	40,444
Real Estate: Mortgage, multi-family [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,611	3,636
Real Estate: Mortgage, multi-family [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	302	308
Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	334,067	334,198
Real Estate: Mortgage, commercial [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	15,424	15,873
Real Estate: Mortgage, commercial [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	89,922	89,801
Real Estate: Mortgage, commercial [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	186,099	185,650
Real Estate: Mortgage, commercial [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	34,981	34,979
Real Estate: Mortgage, commercial [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,925	3,797
Real Estate: Mortgage, commercial [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,716	4,098
Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	24,710	25,157
Loans to individuals [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Loans to individuals [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	97	65
Loans to individuals [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	23,903	24,446
Loans to individuals [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	340	293
Loans to individuals [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	193	195
Loans to individuals [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	177	158
Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	54,709	54,462
Obligations of state and political subdivisions [Member] | Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Obligations of state and political subdivisions [Member] | Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	34,395	37,539
Obligations of state and political subdivisions [Member] | Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	17,160	16,417
Obligations of state and political subdivisions [Member] | Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,154	506
Obligations of state and political subdivisions [Member] | Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Obligations of state and political subdivisions [Member] | Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	$ 0	$ 0

Loans, Past Due Receivables (De

Loans, Past Due Receivables (Details) $ in Thousands	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Mar. 31, 2016USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of accruing loans past due 90 days or more	3	6
Schedule of past due loans [Abstract]
Total Past Due	$ 16,924	$ 12,239
Current	2,290,241	2,264,909
Total Loans Receivable	2,307,165	2,277,148	$ 2,137,439
Accruing Loans Past Due 90 Days or More	281	635
Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	374	358
Current	87,560	92,513
Total Loans Receivable	87,934	92,871	90,620
Accruing Loans Past Due 90 Days or More	0	0
Commercial and Financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	2,017	863
Current	197,685	192,132
Total Loans Receivable	199,702	192,995	173,736
Accruing Loans Past Due 90 Days or More	0	0
Real Estate: Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,411	0
Current	62,373	57,864
Total Loans Receivable	63,784	57,864
Accruing Loans Past Due 90 Days or More	0	0
Real Estate: Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	739	316
Current	124,405	121,245
Total Loans Receivable	125,144	121,561
Accruing Loans Past Due 90 Days or More	60	0
Real Estate: Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	586	319
Current	204,748	202,021
Total Loans Receivable	205,334	202,340	$ 189,882
Accruing Loans Past Due 90 Days or More	0	0
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	6,135	8,570
Current	774,272	758,899
Total Loans Receivable	780,407	767,469
Accruing Loans Past Due 90 Days or More	221	192
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	289	960
Current	127,432	124,440
Total Loans Receivable	127,721	125,400
Accruing Loans Past Due 90 Days or More	0	443
Real Estate: Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	4,394	40
Current	299,259	302,791
Total Loans Receivable	303,653	302,831
Accruing Loans Past Due 90 Days or More	0	0
Real Estate: Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	873	578
Current	333,194	333,620
Total Loans Receivable	334,067	334,198
Accruing Loans Past Due 90 Days or More	0	0
Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	106	235
Current	24,604	24,922
Total Loans Receivable	24,710	25,157
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	54,709	54,462
Total Loans Receivable	54,709	54,462
Accruing Loans Past Due 90 Days or More	0	0
30 - 59 Days Past Due [Member]
Schedule of past due loans [Abstract]
Total Past Due	13,357	6,952
30 - 59 Days Past Due [Member] | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	293	56
30 - 59 Days Past Due [Member] | Commercial and Financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,350	24
30 - 59 Days Past Due [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,411	0
30 - 59 Days Past Due [Member] | Real Estate: Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	679	0
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	586	319
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	3,761	5,649
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	132	330
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	4,354	0
30 - 59 Days Past Due [Member] | Real Estate: Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	694	371
30 - 59 Days Past Due [Member] | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	97	203
30 - 59 Days Past Due [Member] | Obligations of state and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,287	1,413
60 - 89 Days Past Due [Member] | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member] | Commercial and Financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	547	121
60 - 89 Days Past Due [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member] | Real Estate: Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	231
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	694	978
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	21	51
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
60 - 89 Days Past Due [Member] | Real Estate: Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	16	0
60 - 89 Days Past Due [Member] | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	9	32
60 - 89 Days Past Due [Member] | Obligations of state and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due [Member]
Schedule of past due loans [Abstract]
Total Past Due	2,280	3,874
90 Days or More Past Due [Member] | Agricultural [Member]
Schedule of past due loans [Abstract]
Total Past Due	81	302
90 Days or More Past Due [Member] | Commercial and Financial [Member]
Schedule of past due loans [Abstract]
Total Past Due	120	718
90 Days or More Past Due [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due [Member] | Real Estate: Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	60	85
90 Days or More Past Due [Member] | Real Estate: Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	1,680	1,943
90 Days or More Past Due [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
Total Past Due	136	579
90 Days or More Past Due [Member] | Real Estate: Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
Total Past Due	40	40
90 Days or More Past Due [Member] | Real Estate: Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
Total Past Due	163	207
90 Days or More Past Due [Member] | Loans to individuals [Member]
Schedule of past due loans [Abstract]
Total Past Due	0	0
90 Days or More Past Due [Member] | Obligations of state and political subdivisions [Member]
Schedule of past due loans [Abstract]
Total Past Due	$ 0	$ 0

Loans, Impaired Financing Recei

Loans, Impaired Financing Receivable Loan Type (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Summary of certain impaired loan information [Abstract]
Non-accrual loans	$ 9,244	$ 9,938
Accruing loans past due 90 days or more	281	635
TDR loans	12,457	$ 5,408
Decrease accruing loans past due 90 days or more	$ 350
Number of accruing loans past due 90 days or more	3	6
Average 90 days or more past due loan balance	$ 90	$ 110
Agricultural [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,528	1,741
Accruing loans past due 90 days or more	0	0
TDR loans	7,212	91
Commercial and financial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,278	1,354
Accruing loans past due 90 days or more	0	0
TDR loans	509	1,057
Real Estate: Construction, 1 to 4 family residential [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	0
Accruing loans past due 90 days or more	0	0
TDR loans	265	265
Real Estate: Construction, land development and commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	85
Accruing loans past due 90 days or more	60	0
TDR loans	346	118
Real Estate: Mortgage, farmland [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,410	1,205
Accruing loans past due 90 days or more	0	0
TDR loans	1,662	1,389
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	3,921	4,097
Accruing loans past due 90 days or more	221	192
TDR loans	1,362	1,375
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	149	136
Accruing loans past due 90 days or more	0	443
TDR loans	26	26
Real Estate: Mortgage, multi-family [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	239	243
Accruing loans past due 90 days or more	0	0
TDR loans	0	0
Real Estate: Mortgage, commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	719	1,077
Accruing loans past due 90 days or more	0	0
TDR loans	1,075	1,087
Loans to individuals [Member]
Summary of certain impaired loan information [Abstract]
Accruing loans past due 90 days or more	0	0
Troubled Debt Restructuring [Member]
Summary of certain impaired loan information [Abstract]
TDR Loans included within nonaccrual loans	$ 4,170	$ 4,230

Loans, Troubled Debt Restructur

Loans, Troubled Debt Restructuring (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)contract	Dec. 31, 2016USD ($)contract
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 840,000	$ 1,681,000
Summary of information for TDR loans [Abstract]
Number of contracts | contract	52	52
Recorded investment	$ 16,626,000	$ 9,637,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	6
Pre-modification recorded investment	$ 9,612,000
Post-modification recorded investment	9,612,000
Commitments to lend additional borrowings		1,680,000
TDR loans default payment	0	0
Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 143,000	$ 167,000
Summary of information for TDR loans [Abstract]
Number of contracts | contract	7	4
Recorded investment	$ 8,596,000	$ 1,460,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	3
Pre-modification recorded investment	$ 8,783,000
Post-modification recorded investment	8,783,000
Commercial and Financial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 551,000	$ 117,000
Summary of information for TDR loans [Abstract]
Number of contracts | contract	11	14
Recorded investment	$ 1,426,000	$ 2,053,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	0
Pre-modification recorded investment	$ 0
Post-modification recorded investment	0
Real Estate: Construction, 1 to 4 family residential [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 119,000	$ 1,225,000
Summary of information for TDR loans [Abstract]
Number of contracts | contract	3	3
Recorded investment	$ 265,000	$ 265,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	0
Pre-modification recorded investment	$ 0
Post-modification recorded investment	0
Real Estate: Construction, land development and commercial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 6,000	$ 107,000
Summary of information for TDR loans [Abstract]
Number of contracts | contract	2	1
Recorded investment	$ 346,000	$ 118,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	1
Pre-modification recorded investment	$ 231,000
Post-modification recorded investment	231,000
Real Estate: Mortgage, farmland [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 0	$ 0
Summary of information for TDR loans [Abstract]
Number of contracts | contract	8	7
Recorded investment	$ 3,073,000	$ 2,594,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	2
Pre-modification recorded investment	$ 598,000
Post-modification recorded investment	598,000
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 0	$ 0
Summary of information for TDR loans [Abstract]
Number of contracts | contract	12	12
Recorded investment	$ 1,454,000	$ 1,471,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	0
Pre-modification recorded investment	$ 0
Post-modification recorded investment	0
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 16,000	$ 65,000
Summary of information for TDR loans [Abstract]
Number of contracts | contract	1	1
Recorded investment	$ 26,000	$ 26,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	0
Pre-modification recorded investment	$ 0
Post-modification recorded investment	0
Real Estate: Mortgage, multi-family [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 0	$ 0
Summary of information for TDR loans [Abstract]
Number of contracts | contract	0	0
Recorded investment	$ 0	$ 0
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	0
Pre-modification recorded investment	$ 0
Post-modification recorded investment	0
Real Estate: Mortgage, commercial [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 0	$ 0
Summary of information for TDR loans [Abstract]
Number of contracts | contract	8	10
Recorded investment	$ 1,440,000	$ 1,650,000
Summary of troubled debt restructuring loans were modified [Abstract]
Number of contracts | contract	0
Pre-modification recorded investment	$ 0
Post-modification recorded investment	0
Loans to individuals [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable Troubled Debt Restructuring Commitments Outstanding	$ 0	$ 0
Summary of information for TDR loans [Abstract]
Number of contracts | contract	0	0
Recorded investment	$ 0	$ 0

Loans, Impaired Financing Rec37

Loans, Impaired Financing Receivables Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Recorded Investment
With no related allowance recorded	$ 12,816	$ 12,563
With an allowance recorded	17,123	21,101
Total impaired loans	29,939	33,664
Unpaid Principal Balance
With no related allowance recorded	16,394	16,365
With an allowance recorded	17,183	21,377
Total	33,577	37,742
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	1,261	2,343
Total	1,261	$ 2,343
Average Recorded Investment
With no related allowance recorded	12,790
With an allowance recorded	17,268
Total	30,058
Interest Income Recognized
With no related allowance recorded	47
With an allowance recorded	185
Total	232
Decrease in impaired loans	$ 3,730
Percentages of impaired loans to loans held for investment (in hundredths)	1.30%	1.48%
Decrease in nonaccrual loans	$ 700
Increase in TDR Loans	$ 7,050
Prior period within which impairment is being measured	1 year
Number of period within which average appraisals obtained	1 month
Agricultural and Farmland Real Estate [Member]
Interest Income Recognized
Decrease in impaired loans	$ 9,450
Agricultural [Member]
Recorded Investment
With no related allowance recorded	1,528	$ 800
With an allowance recorded	9,860	10,920
Total impaired loans	11,388	11,720
Unpaid Principal Balance
With no related allowance recorded	1,748	971
With an allowance recorded	9,860	10,978
Total	11,608	11,949
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	587	856
Total	587	856
Average Recorded Investment
With no related allowance recorded	1,524
With an allowance recorded	9,967
Total	11,491
Interest Income Recognized
With no related allowance recorded	0
With an allowance recorded	111
Total	111
Commercial and Financial [Member]
Recorded Investment
With no related allowance recorded	1,531	1,540
With an allowance recorded	256	937
Total impaired loans	1,787	2,477
Unpaid Principal Balance
With no related allowance recorded	2,163	2,175
With an allowance recorded	275	955
Total	2,438	3,130
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	144	718
Total	144	718
Average Recorded Investment
With no related allowance recorded	1,555
With an allowance recorded	272
Total	1,827
Interest Income Recognized
With no related allowance recorded	5
With an allowance recorded	1
Total	6
Real Estate: Construction, 1 to 4 family residential [Member]
Recorded Investment
With no related allowance recorded	117	117
With an allowance recorded	289	815
Total impaired loans	406	932
Unpaid Principal Balance
With no related allowance recorded	151	151
With an allowance recorded	289	815
Total	440	966
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	32	105
Total	32	105
Average Recorded Investment
With no related allowance recorded	117
With an allowance recorded	290
Total	407
Interest Income Recognized
With no related allowance recorded	1
With an allowance recorded	3
Total	4
Real Estate: Construction, land development and commercial [Member]
Recorded Investment
With no related allowance recorded	117	204
With an allowance recorded	148	0
Total impaired loans	265	204
Unpaid Principal Balance
With no related allowance recorded	167	290
With an allowance recorded	148	0
Total	315	290
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	40	0
Total	40	0
Average Recorded Investment
With no related allowance recorded	118
With an allowance recorded	148
Total	266
Interest Income Recognized
With no related allowance recorded	1
With an allowance recorded	2
Total	3
Real Estate: Mortgage, farmland [Member]
Recorded Investment
With no related allowance recorded	2,753	2,594
With an allowance recorded	5,749	5,434
Total impaired loans	8,502	8,028
Unpaid Principal Balance
With no related allowance recorded	3,062	2,887
With an allowance recorded	5,749	5,434
Total	8,811	8,321
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	345	390
Total	345	390
Average Recorded Investment
With no related allowance recorded	2,636
With an allowance recorded	5,751
Total	8,387
Interest Income Recognized
With no related allowance recorded	16
With an allowance recorded	61
Total	77
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Recorded Investment
With no related allowance recorded	4,682	5,011
With an allowance recorded	664	1,266
Total impaired loans	5,346	6,277
Unpaid Principal Balance
With no related allowance recorded	5,796	6,137
With an allowance recorded	703	1,374
Total	6,499	7,511
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	59	79
Total	59	79
Average Recorded Investment
With no related allowance recorded	4,726
With an allowance recorded	684
Total	5,410
Interest Income Recognized
With no related allowance recorded	13
With an allowance recorded	4
Total	17
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Recorded Investment
With no related allowance recorded	149	153
With an allowance recorded	26	612
Total impaired loans	175	765
Unpaid Principal Balance
With no related allowance recorded	645	646
With an allowance recorded	26	667
Total	671	1,313
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	3	11
Total	3	11
Average Recorded Investment
With no related allowance recorded	151
With an allowance recorded	26
Total	177
Interest Income Recognized
With no related allowance recorded	0
With an allowance recorded	1
Total	1
Real Estate: Mortgage, multi-family [Member]
Recorded Investment
With no related allowance recorded	239	243
With an allowance recorded	0	0
Total impaired loans	239	243
Unpaid Principal Balance
With no related allowance recorded	361	362
With an allowance recorded	0	0
Total	361	362
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	0	0
Total	0	0
Average Recorded Investment
With no related allowance recorded	241
With an allowance recorded	0
Total	241
Interest Income Recognized
With no related allowance recorded	0
With an allowance recorded	0
Total	0
Real Estate: Mortgage, commercial [Member]
Recorded Investment
With no related allowance recorded	1,700	1,901
With an allowance recorded	95	967
Total impaired loans	1,795	2,868
Unpaid Principal Balance
With no related allowance recorded	2,283	2,727
With an allowance recorded	97	1,004
Total	2,380	3,731
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	15	34
Total	15	34
Average Recorded Investment
With no related allowance recorded	1,722
With an allowance recorded	97
Total	1,819
Interest Income Recognized
With no related allowance recorded	11
With an allowance recorded	1
Total	12
Loans to individuals [Member]
Recorded Investment
With no related allowance recorded	0	0
With an allowance recorded	36	150
Total impaired loans	36	150
Unpaid Principal Balance
With no related allowance recorded	18	19
With an allowance recorded	36	150
Total	54	169
Related Allowance
With no related allowance recorded	0	0
With an allowance recorded	36	150
Total	36	$ 150
Average Recorded Investment
With no related allowance recorded	0
With an allowance recorded	33
Total	33
Interest Income Recognized
With no related allowance recorded	0
With an allowance recorded	1
Total	$ 1

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Readily Available Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents	$ 151,273	$ 38,197
Investment securities	0	0
Loans held for sale	0	0
Loans
Agricultural	0	0
Commercial and financial	0	0
Real estate:
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Obligations of state and political subdivisions	0	0
Accrued interest receivable	0	0
Total financial instrument assets	151,273	38,197
Deposits
Noninterest-bearing deposits	0	0
Interest-bearing deposits	0	0
Other borrowings	0	0
Federal Home Loan Bank borrowings	0	0
Interest rate swaps	0
Accrued interest payable	0	0
Total financial instrument liabilities	0	0
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
Observable Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents	0	0
Investment securities	286,016	279,950
Loans held for sale	1,656	9,806
Loans
Agricultural	0	0
Commercial and financial	0	0
Real estate:
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Obligations of state and political subdivisions	0	0
Accrued interest receivable	10,286	9,121
Total financial instrument assets	297,958	298,877
Deposits
Noninterest-bearing deposits	339,867	348,505
Interest-bearing deposits	1,837,543	1,691,679
Other borrowings	28,086	33,489
Federal Home Loan Bank borrowings	228,318	231,232
Interest rate swaps	3,589	3,938
Accrued interest payable	940	984
Total financial instrument liabilities	2,438,343	2,309,827
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
Company Determined Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents	0	0
Investment securities	0	0
Loans held for sale	0	0
Loans
Agricultural	85,394	89,862
Commercial and financial	195,651	188,292
Real estate:
Construction, 1 to 4 family residential	62,706	56,715
Construction, land development and commercial	123,029	119,716
Mortgage, farmland	201,988	199,043
Mortgage, 1 to 4 family first liens	767,495	764,174
Mortgage, 1 to 4 family junior liens	131,430	129,339
Mortgage, multi-family	298,276	297,646
Mortgage, commercial	328,530	328,948
Loans to individuals	24,188	24,499
Obligations of state and political subdivisions	53,115	52,860
Accrued interest receivable	0	0
Total financial instrument assets	2,271,802	2,251,094
Deposits
Noninterest-bearing deposits	0	0
Interest-bearing deposits	0	0
Other borrowings	0	0
Federal Home Loan Bank borrowings	0	0
Interest rate swaps	0
Accrued interest payable	0	0
Total financial instrument liabilities	0	0
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
Carrying Amount [Member]
Financial instrument assets:
Cash and cash equivalents	151,273	38,197
Investment securities	286,016	279,950
Loans held for sale	1,656	9,806
Loans
Agricultural	85,429	89,924
Commercial and financial	195,803	188,464
Real estate:
Construction, 1 to 4 family residential	62,689	56,841
Construction, land development and commercial	123,145	119,694
Mortgage, farmland	201,827	198,923
Mortgage, 1 to 4 family first liens	773,417	760,909
Mortgage, 1 to 4 family junior liens	126,539	124,283
Mortgage, multi-family	301,827	301,162
Mortgage, commercial	331,535	331,822
Loans to individuals	24,205	24,515
Obligations of state and political subdivisions	54,299	54,081
Accrued interest receivable	10,286	9,121
Total financial instrument assets	2,729,946	2,587,692
Deposits
Noninterest-bearing deposits	339,867	348,505
Interest-bearing deposits	1,833,465	1,687,807
Other borrowings	28,086	33,489
Federal Home Loan Bank borrowings	235,000	235,000
Interest rate swaps	3,589	3,938
Accrued interest payable	940	984
Total financial instrument liabilities	2,440,947	2,309,723
Financial instrument with off-balance sheet risk:
Loan commitments	432,943	388,666
Letters of credit	8,885	9,024
Total financial instrument liabilities with off-balance-sheet risk	441,828	397,690
Estimated Fair Value [Member]
Financial instrument assets:
Cash and cash equivalents	151,273	38,197
Investment securities	286,016	279,950
Loans held for sale	1,656	9,806
Loans
Agricultural	85,394	89,862
Commercial and financial	195,651	188,292
Real estate:
Construction, 1 to 4 family residential	62,706	56,715
Construction, land development and commercial	123,029	119,716
Mortgage, farmland	201,988	199,043
Mortgage, 1 to 4 family first liens	767,495	764,174
Mortgage, 1 to 4 family junior liens	131,430	129,339
Mortgage, multi-family	298,276	297,646
Mortgage, commercial	328,530	328,948
Loans to individuals	24,188	24,499
Obligations of state and political subdivisions	53,115	52,860
Accrued interest receivable	10,286	9,121
Total financial instrument assets	2,721,033	2,588,168
Deposits
Noninterest-bearing deposits	339,867	348,505
Interest-bearing deposits	1,837,543	1,691,679
Other borrowings	28,086	33,489
Federal Home Loan Bank borrowings	228,318	231,232
Interest rate swaps	3,589	3,938
Accrued interest payable	940	984
Total financial instrument liabilities	2,438,343	2,309,827
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

Fair Value Measurements, Assets

Fair Value Measurements, Assets and Liabilities Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	$ 273,409	$ 267,537
U.S. Treasury [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	32,389	27,482
State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	183,276	178,395
Readily Available Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative Financial Instruments	0
Total	151,273	38,197
Observable Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative Financial Instruments	(3,589)	(3,938)
Total	297,958	298,877
Company Determined Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative Financial Instruments	0
Total	2,271,802	2,251,094
Recurring Basis [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	269,820	263,599
Recurring Basis [Member] | U.S. Treasury [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	32,389	27,482
Recurring Basis [Member] | State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	57,744	178,395
Recurring Basis [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	183,276	61,660
Recurring Basis [Member] | Interest rate swaps [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative Financial Instruments	(3,589)	(3,938)
Recurring Basis [Member] | Readily Available Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	0	0
Recurring Basis [Member] | Readily Available Market Prices [Member] | U.S. Treasury [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	0	0
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]
Securities available for sale	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]
Securities available for sale	0	0
Recurring Basis [Member] | Observable Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	269,820	263,599
Recurring Basis [Member] | Observable Market Prices [Member] | U.S. Treasury [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	32,389	27,482
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]
Securities available for sale	57,744	178,395
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]
Securities available for sale	183,276	61,660
Recurring Basis [Member] | Observable Market Prices [Member] | Interest rate swaps [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Derivative Financial Instruments	(3,589)	(3,938)
Recurring Basis [Member] | Company Determined Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | U.S. Treasury [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Securities available for sale	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]
Securities available for sale	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]
Securities available for sale	$ 0	$ 0

Fair Value Measurements, Asse40

Fair Value Measurements, Assets and Liabilities on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Readily Available Market Prices [Member]
Loans
Agricultural	$ 0	$ 0
Commercial and financial	0	0
Real Estate [Abstract]
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Total financial instrument assets	151,273	38,197
Observable Market Prices [Member]
Loans
Agricultural	0	0
Commercial and financial	0	0
Real Estate [Abstract]
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Total financial instrument assets	297,958	298,877
Company Determined Market Prices [Member]
Loans
Agricultural	85,394	89,862
Commercial and financial	195,651	188,292
Real Estate [Abstract]
Construction, land development and commercial	123,029	119,716
Mortgage, farmland	201,988	199,043
Mortgage, 1 to 4 family first liens	767,495	764,174
Mortgage, 1 to 4 family junior liens	131,430	129,339
Mortgage, multi-family	298,276	297,646
Mortgage, commercial	328,530	328,948
Loans to individuals	24,188	24,499
Total financial instrument assets	2,271,802	2,251,094
Nonrecurring Basis [Member]
Loans
Agricultural	10,714	10,773
Commercial and financial	1,383	1,397
Real Estate [Abstract]
Construction, 1 to 4 family residential	224	827
Construction, land development and commercial	197	85
Mortgage, farmland	7,624	7,077
Mortgage, 1 to 4 family first liens	4,968	5,424
Mortgage, 1 to 4 family junior liens	145	194
Mortgage, multi-family	239	244
Mortgage, commercial	1,195	1,541
Loans to individuals	0	0
Foreclosed assets	0	75
Total financial instrument assets	26,689	27,637
Total Losses	59	984
Nonrecurring Basis [Member] | Agricultural [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] | Commercial and financial [Member]
Real Estate [Abstract]
Total Losses	0	143
Nonrecurring Basis [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] | Real Estate: Construction, land development and commercial [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] | Real Estate: Mortgage, farmland [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Real Estate [Abstract]
Total Losses	42	756
Nonrecurring Basis [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Real Estate [Abstract]
Total Losses	17	0
Nonrecurring Basis [Member] | Real Estate: Mortgage, multi-family [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] | Real Estate: Mortgage, commercial [Member]
Real Estate [Abstract]
Total Losses	0	65
Nonrecurring Basis [Member] | Loans to individuals [Member]
Real Estate [Abstract]
Total Losses	0	0
Nonrecurring Basis [Member] | Foreclosed assets [Member]
Real Estate [Abstract]
Total Losses	0	20
Nonrecurring Basis [Member] | Readily Available Market Prices [Member]
Loans
Agricultural	0	0
Commercial and financial	0	0
Real Estate [Abstract]
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Foreclosed assets	0	0
Total financial instrument assets	0	0
Nonrecurring Basis [Member] | Observable Market Prices [Member]
Loans
Agricultural	0	0
Commercial and financial	0	0
Real Estate [Abstract]
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Foreclosed assets	0	0
Total financial instrument assets	0	0
Nonrecurring Basis [Member] | Company Determined Market Prices [Member]
Loans
Agricultural	10,714	10,773
Commercial and financial	1,383	1,397
Real Estate [Abstract]
Construction, 1 to 4 family residential	224	827
Construction, land development and commercial	197	85
Mortgage, farmland	7,624	7,077
Mortgage, 1 to 4 family first liens	4,968	5,424
Mortgage, 1 to 4 family junior liens	145	194
Mortgage, multi-family	239	244
Mortgage, commercial	1,195	1,541
Loans to individuals	0	0
Foreclosed assets	0	75
Total financial instrument assets	$ 26,689	$ 27,637

Stock Repurchase Program (Detai

Stock Repurchase Program (Details) - $ / shares	3 Months Ended		140 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Jul. 26, 2005
Equity [Abstract]
Maximum number of share authorized to repurchase under the program (in shares)				1,500,000
Common stock purchased during the period (in shares)	9,346	35,252	972,297
Average price per share (in dollars per share)	$ 49.78

Commitments and Contingencies42

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
State and political subdivisions [Member]
Concentration Risk [Line Items]
Investment in securities issued by state and political subdivisions within the state of Iowa	$ 79,540
Home equity loans [Member]
Firm loan commitments and unused portion of lines of credit [Abstract]
Total financial instrument liabilities with off-balance-sheet risk	51,362	$ 48,785
Credit cards [Member]
Firm loan commitments and unused portion of lines of credit [Abstract]
Total financial instrument liabilities with off-balance-sheet risk	47,168	45,738
Commercial, real estate and home construction [Member]
Firm loan commitments and unused portion of lines of credit [Abstract]
Total financial instrument liabilities with off-balance-sheet risk	147,200	113,251
Commercial lines and real estate purchase loan [Member]
Firm loan commitments and unused portion of lines of credit [Abstract]
Total financial instrument liabilities with off-balance-sheet risk	187,213	180,892
Outstanding letters of credit [Member]
Firm loan commitments and unused portion of lines of credit [Abstract]
Total financial instrument liabilities with off-balance-sheet risk	$ 8,885	$ 9,024

Income Taxes (Details)

Income Taxes (Details)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Examination [Line Items]
Effective tax rate	30.89%	29.65%
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Income tax examination, years under examination	December 31, 2016, 2015, and 2014
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Income tax examination, years under examination	December 31, 2016, 2015, and 2014

Derivative Financial Instrume44

Derivative Financial Instruments (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Nov. 07, 2013USD ($)derivative
Derivatives, Fair Value [Line Items]
Owned and pledged as collateral	$ 3,590,000
Interest Rate Swap 1 [Member] | Interest Expense [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Amount of Gain (Loss), Reclassified from AOCI into Income (Effective Portion)	0	$ 0
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
Interest Rate Swap 1 [Member] | Other Liabilities [Member]
Derivative instrument according to type of hedges [Abstract]
Notional Amount	25,000,000	25,000,000	$ 25,000,000
Fair Value	$ (948,000)	$ (1,097,000)
Maturity	Nov. 9, 2020	Nov. 9, 2020
Interest Rate Swap 1 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Amount of Gain (Loss), Recognized in OCI (Effective Portion)	$ 92,000	$ 250,000
Interest Rate Swap 2 [Member] | Interest Expense [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Amount of Gain (Loss), Reclassified from AOCI into Income (Effective Portion)	0	0
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
Interest Rate Swap 2 [Member] | Other Liabilities [Member]
Derivative instrument according to type of hedges [Abstract]
Notional Amount	25,000,000	25,000,000	$ 25,000,000
Fair Value	$ (2,641,000)	$ (2,841,000)
Maturity	Nov. 7, 2023	Nov. 7, 2023
Interest Rate Swap 2 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Amount of Gain (Loss), Recognized in OCI (Effective Portion)	$ 124,000	$ (101,000)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Number of interest rate swaps held | derivative			2
Designated as Hedging Instrument [Member] | Interest Rate Swap 1 [Member]
Derivatives, Fair Value [Line Items]
Number of interest rate swaps held | derivative			1