Hills Bancorporation (HBIA) 10-K 9 Mar 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 29, 2016	Jun. 30, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	HILLS BANCORPORATION
Entity Central Index Key	732,417
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$ 327,796,423
Entity Common Stock, Shares Outstanding		9,296,802
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 35,427	$ 29,174
Investment securities available for sale at fair value (amortized cost 2015 $261,991; 2014 $256,920) (Notes 1, 2 and 13)	264,235	258,992
Stock of Federal Home Loan Bank	11,834	8,248
Stock of Federal Home Loan Bank	5,554	4,476
Loans, net of allowance for loan losses (2015 $26,510; 2014 $24,020) (Notes 1, 3, and 12)	2,099,174	1,961,369
Property and equipment, net (Note 4)	33,522	29,071
Tax credit real estate	16,314	17,259
Accrued interest receivable	8,672	8,276
Deferred income taxes, net (Note 10)	11,695	9,938
Other real estate	439	1,213
Goodwill	2,500	2,500
Other assets	4,241	3,802
Total Assets	2,493,607	2,334,318
Liabilities
Noninterest-bearing deposits	314,968	288,718
Interest-bearing deposits (Note 5)	1,575,734	1,546,351
Total deposits	1,890,702	1,835,069
Other borrowings (Note 6)	44,051	47,499
Federal Home Loan Bank borrowings (Note 7)	225,000	140,000
Accrued interest payable	846	902
Other liabilities	23,271	20,749
Total Liabilities	$ 2,183,870	$ 2,044,219
Commitments and Contingencies (Notes 9 and 15)
Ownership Plan (ESOP) (Note 9)	$ 37,562	$ 34,571
Stockholders' Equity (Note 11)
Common stock, no par value; authorized 20,000,000 shares; issued 2015 10,199,643 shares; 2014 10,177,854 shares	0	0
Paid in capital	43,697	42,925
Retained earnings	294,487	271,924
Accumulated other comprehensive (loss) income (Note 8)	(1,195)	(448)
Unearned ESOP shares	0	(504)
Treasury stock at cost (2015 877,589 shares; 2014 797,422 shares)	(27,252)	(23,798)
Total Stockholders' Equity	309,737	290,099
Less maximum cash obligation related to ESOP shares (Note 9)	37,562	34,571
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	272,175	255,528
Total Liabilities & Stockholders' Equity	$ 2,493,607	$ 2,334,318

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Investment securities available for sale, amortized cost	$ 261,991	$ 256,920
Loans, allowance for loan losses	$ 26,510	$ 24,020
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)	10,199,643	10,177,854
Treasury stock at cost (in shares)	877,589	797,422

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income:
Loans, including fees	$ 87,589	$ 82,079	$ 80,230
Investment securities:
Taxable	1,256	1,099	1,254
Nontaxable	3,290	3,368	3,337
Federal funds sold	32	36	74
Total interest income	92,167	86,582	84,895
Interest expense:
Deposits	8,213	9,305	11,112
Other borrowings	149	142	146
FHLB borrowings	6,605	5,590	5,590
Total interest expense	14,967	15,037	16,848
Net interest income	77,200	71,545	68,047
Provision for loan losses (Note 3)	1,655	1,042	1,131
Net interest income after provision for loan losses	75,545	70,503	66,916
Noninterest income:
Net gain on sale of loans	1,439	894	1,925
Trust fees	6,565	6,065	5,294
Service charges and fees	8,336	8,025	7,805
Rental revenue on tax credit real estate	1,688	1,490	1,511
Net gain on sale of other real estate owned and other repossessed assets	162	386	183
Other noninterest income	2,612	2,496	2,487
Total other income	20,802	19,356	19,205
Noninterest expenses:
Salaries and employee benefits	27,878	26,450	24,845
Occupancy	3,972	3,807	3,699
Furniture and equipment	5,317	4,975	4,711
Office supplies and postage	1,732	1,546	1,706
Advertising and business development	3,360	3,073	2,638
Outside services	7,114	6,741	6,782
Rental expenses on tax credit real estate	2,331	2,189	1,985
FDIC insurance assessment	1,165	1,098	1,016
Other noninterest expenses	2,591	1,877	1,896
Total other expenses	55,460	51,756	49,278
Income before income taxes	40,887	38,103	36,843
Income taxes (Note 10)	12,469	11,129	10,912
Net income	$ 28,418	$ 26,974	$ 25,931
Earnings per share:
Basic (in dollars per share)	$ 3.04	$ 2.88	$ 2.76
Diluted (in dollars per share)	$ 3.04	$ 2.87	$ 2.75

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 28,418	$ 26,974	$ 25,931
Securities:
Net change in unrealized gain (loss) on securities available for sale	172	264	(4,580)
Reclassification adjustment for net (gains) losses realized in net income	0	0	(17)
Income taxes	(65)	(101)	1,758
Other comprehensive income (loss) on securities available for sale	107	163	(2,839)
Derivatives used in cash flow hedging relationships:
Net change in unrealized (loss) gain on derivatives	(1,384)	(3,565)	769
Income taxes	530	1,363	(294)
Other comprehensive (loss) income on cash flow hedges	(854)	(2,202)	475
Other comprehensive loss, net of tax	(747)	(2,039)	(2,364)
Comprehensive income	$ 27,671	$ 24,935	$ 23,567

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Unearned ESOP Shares [Member]	Treasury Stock [Member]	Maximum Cash Obligation Related To ESOP Shares [Member]
Beginning Balance at Dec. 31, 2012	$ 225,196	$ 42,241	$ 229,625	$ 3,955	$ (1,513)	$ (18,397)	$ (30,715)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 18,314, 25,024, and 17,92812,512, 8,964, and 12,825 shares of common stock for the years ending 2015, 2014, and 2013, respectively	443	443	0	0	0	0	0
Issuance of 4,155, 4,184, and 4,144 shares of common stock under the employee stock purchase plan for the years ending 2015, 2014, and 2013, respectively	146	146	$ 0	$ 0	$ 0	$ 0	$ 0
Unearned restricted stock compensation	(800)	(800)
Forfeiture of 1,042, 1,142, and 1,050 shares of common stock for the years ending 2015, 2014, and 2013, respectively	(35)	(35)	$ 0	$ 0	$ 0	$ 0	$ 0
Share-based compensation	28	28	0	0	0	0	0
Income tax benefit related to share-based compensation	92	92	0	0	0	0	0
Change related to ESOP shares	1,141	0	0	0	0	0	1,141
Release of 15,256, 16,004, and 16,720 shares of common stock under the employee stock ownership plan for the years ending 2015, 2014, and 2013, respectively	584	79	0	0	505	0	0
Net income	25,931	0	25,931	0	0	0	0
Cash dividends ($0.625, $0.575, and $0.550 per share) for the years ending 2015, 2014, and 2013, respectively	(5,186)	0	(5,186)	0	0	0	0
Purchase of 80,168, 102,884, and 38,408 shares of common stock for the years ending 2015, 2014, and 2013, respectively	(1,387)	0	0	0	0	(1,387)	0
Other comprehensive loss	(2,364)	0	0	(2,364)	0	0	0
Ending Balance at Dec. 31, 2013	243,789	42,194	250,370	1,591	(1,008)	(19,784)	(29,574)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 18,314, 25,024, and 17,92812,512, 8,964, and 12,825 shares of common stock for the years ending 2015, 2014, and 2013, respectively	862	862	0	0	0	0	0
Issuance of 4,155, 4,184, and 4,144 shares of common stock under the employee stock purchase plan for the years ending 2015, 2014, and 2013, respectively	158	158	0	0	0	0	0
Unearned restricted stock compensation	(464)	(464)	0	0	0	0	0
Forfeiture of 1,042, 1,142, and 1,050 shares of common stock for the years ending 2015, 2014, and 2013, respectively	(40)	(40)	0	0	0	0	0
Share-based compensation	29	29	0	0	0	0	0
Income tax benefit related to share-based compensation	60	60	0	0	0	0	0
Change related to ESOP shares	(4,997)	0	0	0	0	0	(4,997)
Release of 15,256, 16,004, and 16,720 shares of common stock under the employee stock ownership plan for the years ending 2015, 2014, and 2013, respectively	630	126	0	0	504	0	0
Net income	26,974	0	26,974	0	0	0	0
Cash dividends ($0.625, $0.575, and $0.550 per share) for the years ending 2015, 2014, and 2013, respectively	(5,420)	0	(5,420)	0	0	0	0
Purchase of 80,168, 102,884, and 38,408 shares of common stock for the years ending 2015, 2014, and 2013, respectively	(4,014)	0	0	0	0	(4,014)	0
Other comprehensive loss	(2,039)	0	0	(2,039)	0	0	0
Ending Balance at Dec. 31, 2014	255,528	42,925	271,924	(448)	(504)	(23,798)	(34,571)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 18,314, 25,024, and 17,92812,512, 8,964, and 12,825 shares of common stock for the years ending 2015, 2014, and 2013, respectively	807	807	0	0	0	0	0
Issuance of 4,155, 4,184, and 4,144 shares of common stock under the employee stock purchase plan for the years ending 2015, 2014, and 2013, respectively	172	172	0	0	0	0	0
Unearned restricted stock compensation	(381)	(381)	0	0	0	0	0
Forfeiture of 1,042, 1,142, and 1,050 shares of common stock for the years ending 2015, 2014, and 2013, respectively	(37)	(37)	0	0	0	0	0
Share-based compensation	29	29	0	0	0	0	0
Income tax benefit related to share-based compensation	8	8	0	0	0	0	0
Change related to ESOP shares	(2,991)	0	0	0	0	0	(2,991)
Release of 15,256, 16,004, and 16,720 shares of common stock under the employee stock ownership plan for the years ending 2015, 2014, and 2013, respectively	678	174	0	0	504	0	0
Net income	28,418	0	28,418	0	0	0	0
Cash dividends ($0.625, $0.575, and $0.550 per share) for the years ending 2015, 2014, and 2013, respectively	(5,855)	0	(5,855)	0	0	0	0
Purchase of 80,168, 102,884, and 38,408 shares of common stock for the years ending 2015, 2014, and 2013, respectively	(3,454)	0	0	0	0	(3,454)	0
Other comprehensive loss	(747)	0	0	(747)	0	0	0
Ending Balance at Dec. 31, 2015	$ 272,175	$ 43,697	$ 294,487	$ (1,195)	$ 0	$ (27,252)	$ (37,562)

CONSOLIDATED STATEMENTS OF STO7

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)	18,314	25,024	17,928
Issuance of common stock purchased under the Employee Stock Purchase Plan (in shares)	4,155	4,184	4,144
Forfeiture of common stock (in shares)	1,042	1,142	1,050
Release of shares of common stock under the employee stock ownership plan (in shares)	15,256	16,004	16,720
Cash dividends (in dollars per share)	$ 0.625	$ 0.575	$ 0.55
Purchase of common stock (in shares)	80,168	102,884	38,408

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 28,418	$ 26,974	$ 25,931
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:
Depreciation	2,748	2,559	2,790
Provision for loan losses	1,655	1,042	1,131
Net gain on sale of investment securities	0	0	(17)
Share-based compensation	29	29	28
Compensation expensed through issuance of common stock	1,657	1,549	997
Excess tax benefits related to share-based compensation	(8)	(60)	(92)
Forfeiture of common stock	(37)	(40)	(35)
Provision for deferred income taxes	(1,292)	(71)	3
Net gain on sale of other real estate owned and other repossessed assets	(162)	(386)	(183)
(Increase) decrease in accrued interest receivable	(396)	(600)	175
Amortization of premium on investment securities, net	647	865	1,089
Decrease in prepaid FDIC insurance	0	0	2,957
(Increase) decrease in other assets	(431)	(19)	2,438
Increase (decrease) in accrued interest and other liabilities	701	852	(743)
Loans originated for sale	(168,188)	(114,725)	(204,875)
Proceeds on sales of loans	168,549	116,070	230,129
Net gain on sales of loans	(1,439)	(894)	(1,925)
Net cash and cash equivalents provided by operating activities	32,451	33,145	59,798
Cash Flows from Investing Activities
Proceeds from maturities of investment securities available for sale	50,833	58,094	40,423
Proceeds from sales of investment securities available for sale	0	0	566
Purchases of investment securities available for sale	(60,137)	(79,846)	(58,503)
Loans made to customers, net of collections	(139,164)	(162,658)	(106,941)
Proceeds on sale of other real estate owned and other repossessed assets	640	1,208	1,003
Purchases of property and equipment	(7,199)	(1,794)	(2,002)
Expense from tax credit real estate, net	945	921	565
Net cash and cash equivalents used in investing activities	(154,082)	(184,075)	(124,889)
Cash Flows from Financing Activities
Net increase in deposits	55,633	125,192	47,333
Net (decrease) increase in short-term borrowings	(3,448)	5,483	3,233
Borrowings from FHLB	188,000	35,000	0
Payments on FHLB Borrowings	(103,000)	(20,000)	0
Borrowings from FRB	4	1	1
Payments on FRB borrowings	(4)	(1)	(1)
Stock options exercised	0	101	175
Excess tax benefits related to share-based compensation	8	60	93
Purchase of treasury stock	(3,454)	(4,014)	(1,387)
Dividends paid	(5,855)	(5,420)	(5,186)
Net cash and cash equivalents used by financing activities	127,884	136,402	44,261
Decrease in cash and cash equivalents	6,253	(14,528)	(19,880)
Cash and cash equivalents:
Beginning of year	29,174	43,702	63,582
End of year	35,427	29,174	43,702
Cash payments for:
Interest paid to depositors	8,269	9,505	11,371
Interest paid on other obligations	6,754	5,732	5,736
Income taxes paid	13,711	11,546	9,616
Income taxes paid
Increase (decrease) in maximum cash obligation related to ESOP shares	2,991	4,997	(1,141)
Transfers to other real estate owned	305	2,470	1,090
Sale and financing of other real estate owned	$ 601	$ 976	$ 475

Nature of Activities and Signif

Nature of Activities and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Activities and Significant Accounting Policies	Nature of Activities and Significant Accounting Policies Nature of activities : Hills Bancorporation (the "Company") is a holding company engaged in the business of commercial banking. The Company's subsidiary is Hills Bank and Trust Company, Hills, Iowa (the “Bank”), which is wholly-owned. The Bank is a full-service commercial bank extending its services to individuals, businesses, governmental units and institutional customers primarily in the communities of Hills, Iowa City, Coralville, North Liberty, Lisbon, Mount Vernon, Kalona, Wellman, Cedar Rapids, Marion and Washington, Iowa. The Bank competes with other financial institutions and non-financial institutions providing similar financial products. Although the loan activity of the Bank is diversified with commercial and agricultural loans, real estate loans, automobile, installment and other consumer loans, the Bank's credit is concentrated in real estate loans. All of the Company’s operations are considered to be one reportable operating segment. Accounting estimates : The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Certain significant estimates : The allowance for loan losses, fair values of securities and other financial instruments, and share-based compensation expense involve certain significant estimates made by management. These estimates are reviewed by management routinely and it is reasonably possible that circumstances that exist at December 31, 2015 may change in the near-term and the effect could be material to the consolidated financial statements. Principles of consolidation : The consolidated financial statements include the accounts of the Company and its subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation. Revenue recognition : Interest income on loans and investment securities is recognized on the accrual method. Loan origination fees of mortgage loans originated for sale are recognized when the loans are sold. Trust fees, deposit account service charges and other fees are recognized when the services are provided or when customers use the services. Cash and cash equivalents : The Company considers all investments with original maturities of three months or less to be cash equivalents. At December 31, 2015 and 2014 , cash equivalents consisted primarily of deposits with other banks. Investment securities : Available-for-sale securities consist of debt securities not classified as trading or held to maturity. Available-for-sale securities are stated at fair value, and unrealized holding gains and losses, net of the related deferred tax effect, are reported as a separate component of stockholders' equity. There were no trading or held to maturity securities as of December 31, 2015 or 2014 . Stock of the Federal Home Loan Bank is carried at cost. The Company has evaluated the stock and determined there is no impairment. Premiums and discounts on debt securities are amortized or accreted over the period to maturity of those securities. The method of amortization results in a constant effective yield on those securities (the interest method). Realized gains and losses on investment securities are included in income, determined on the basis of the cost of the specific securities sold. Declines in the fair value of investment securities available for sale (with certain exceptions for debt securities noted below) that are deemed to be other-than-temporary are charged to earnings as a realized loss, and a new cost basis for the securities is established. In evaluating other-than-temporary impairment, the Company considers the length of time and extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value in the near term. Declines in the fair value of debt securities below amortized cost are deemed to be other-than-temporary in circumstances where: (1) the Company has the intent to sell a security; (2) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell a security or if it is more likely than not that the Company will be required to sell the security before recovery, an other-than-temporary impairment write-down is recognized in earnings equal to the difference between the security’s amortized cost basis and its fair value. If the Company does not intend to sell the security or it is not more likely than not that the Company will be required to sell the security before recovery, the other-than-temporary impairment write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in other comprehensive income. Realized securities gains or losses on securities sales (using specific identification method) and declines in value judged to be other-than-temporary are included in investment securities gains (losses), net, in the consolidated statements of income. Loans : Loans are stated at the amount of unpaid principal, reduced by the allowance for loan losses. Interest income is accrued on the unpaid balances as earned. Loans held for sale are stated at the lower of aggregate cost or estimated fair value. Loans are sold on a non-recourse basis with servicing released and gains and losses are recognized based on the difference between sales proceeds and the carrying value of the loan. The Company has had very few experiences of repurchasing loans previously sold into the secondary market. A specific reserve was not considered necessary based on the Company’s historical experience with repurchase activity. The allowance for loan losses is established through a provision for loan losses charged to expense. Loans are charged against the allowance when management believes the collectability of principal is unlikely. The allowance for loan losses is maintained at a level considered adequate to provide for probable losses that can be reasonably anticipated. The allowance is increased by provisions charged to expense and is reduced by net charge-offs. The Bank makes continuous reviews of the loan portfolio and considers current economic conditions, historical loss experience, review of specific problem loans and other factors in determining the adequacy of the allowance. Management classifies loans within the following categories: excellent, good, satisfactory, monitor, special mention and substandard. The policy for charging off loans is consistent throughout all loan categories. A loan is charged off based on criteria that includes but is not limited to: delinquency status, financial condition of the entire customer credit line and underlying collateral coverage, economic or external conditions that might impact full repayment of the loan, legal issues, overdrafts, and the customer’s willingness to work with the Company. Loans are considered impaired when, based on current information and events, it is probable the Bank will not be able to collect all amounts due. An impaired loan includes any loan that has been placed on nonaccrual status, loans greater than 90 days past due and still accruing and TDR loans. They also include loans, based on current information and events, that it is likely the Bank will be unable to collect all amounts due according to the contractual terms of the original loan agreement. The portion of the allowance for loan losses applicable to impaired loans has been computed based on the present value of the estimated future cash flows of interest and principal discounted at the loans effective interest rate or on the fair value of the collateral for collateral dependent loans. The entire change in present value of expected cash flows of impaired loans or of collateral value is reported as provision expense in the same manner in which impairment initially was recognized or as a reduction in the amount of provision expense that otherwise would be reported. Interest income on nonaccrual loans is recognized once principal has been recovered. The accrual of interest income on loans is discontinued when, in the opinion of management, there is reasonable doubt as to the borrower's ability to meet payments of interest or principal when they become due, which is generally when a loan is 90 days or more past due. When a loan is placed on nonaccrual status, all previously accrued and unpaid interest is reversed. Loans are returned to an accrual status when all of the principal and interest amounts contractually due are brought current and repayment of the remaining contractual principal and interest is expected. A loan may also return to accrual status if additional collateral is received from the borrower and, in the opinion of management, the financial position of the borrower indicates that there is no longer any reasonable doubt as to the collection of the amount contractually due. Payment received on nonaccrual loans are applied first to principal. Once principal is recovered, any remaining payments received are applied to interest income. As of December 31, 2015 , none of the Company’s nonaccrual loans were earning interest on a cash basis. Nonrefundable loan fees and origination costs are deferred and recognized as a yield adjustment over the life of the related loan. Troubled debt restructurings (“TDR loans”) : A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that leads to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses to the Company. A loan that is modified at a market rate of interest is no longer classified as troubled debt restructuring in the quarter following the modification if the borrower is no longer experiencing financial difficulties. Performance prior to the restructuring is considered when assessing whether the borrower can meet the new terms. At the time of restructuring, loans included in a troubled debt restructuring may be considered nonaccrual loans. TDR loans are returned to accrual status under the same criteria noted under loans above. Transfers of financial assets : Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets. Credit related financial instruments : In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit and standby letters of credit. Such financial instruments are recorded when they are funded. Tax credit real estate : Tax credit real estate represents two multi-family rental properties, three assisted living rental properties, a multi-tenant rental property for persons with disabilities, and a multi-family senior living rental property, all which are affordable housing projects as of December 31, 2015 . The Bank has a 99% or greater limited partnership interest in each limited partnership. The investment in each was completed after the projects had been developed by the general partner. The properties are recorded at cost less accumulated depreciation. The Company evaluates the recoverability of the carrying value on a regular basis. If the recoverability was determined to be in doubt, a valuation allowance would be established by way of a charge to expense. Depreciation expense is provided on a straight-line basis over the estimated useful life of the assets. Expenditures for normal repairs and maintenance are charged to expense as incurred. The financial condition, results of operations and cash flows of each limited partnership is consolidated in the Company’s Consolidated Financial Statements. The operations of the properties are not expected to contribute significantly to the Company’s income before income taxes. However, the properties do contribute in the form of income tax credits, which lowers the Company’s effective tax rate. Once established, the credits on each property last for ten years and are passed through from the limited partnerships to the Bank and reduces the consolidated federal tax liability of the Company. Property and equipment : Property and equipment is stated at cost less accumulated depreciation. Depreciation is computed using primarily declining-balance methods over the estimated useful lives of 7-40 years for buildings and improvements and 3-10 years for furniture and equipment. Deferred income taxes : Deferred income taxes are provided under the asset and liability method whereby deferred tax assets are recognized for deductible temporary differences and net operating loss, and tax credit carryforwards and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax bases. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are adjusted for the effects of changes in tax laws and rates on the date of enactment. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. Interest and penalties on unrecognized tax benefits are classified as other noninterest expense. As of December 31, 2015 , the Company had no material unrecognized tax benefits. Goodwill : Goodwill represents the excess of cost over the fair value of the net assets acquired, and is not subject to amortization, but requires, at a minimum, annual impairment tests for intangibles that are determined to have an indefinite life. Other real estate : Other real estate represents property acquired through foreclosures and settlements of loans. Property acquired is carried at the lower of the principal amount of the loan outstanding at the time of acquisition, plus any acquisition costs, or the estimated fair value of the property, less disposal costs. The Bank will obtain updated appraisals to determine the estimated fair value of the property based on the type of collateral securing the loan and the date of the latest appraisal. Subsequent write downs estimated on the basis of later valuations are charged to net loss on sale of other real estate owned and other repossessed assets. Net operating expenses incurred in maintaining such properties are charged to other non-interest expense. Net capital expenditures incurred are capitalized to the property. Derivative financial instruments : The Bank uses interest rate swaps as part of its interest rate risk management. Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 815 establishes accounting and reporting standards for derivative instruments and hedging activities. The Bank records all interest rate swaps on the balance sheet at fair value. Derivatives used to hedge the exposure to variability in expected future cash flows are considered cash flow hedges. To qualify for hedge accounting, the Bank must comply with the detailed rules and documentation requirements at the inception of the hedge, and hedge effectiveness is assessed at inception and periodically throughout the life of the hedging relationship. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivatives is initially reported in other comprehensive income and subsequently reclassified to interest income or expense when the hedged transaction affects earnings, while the ineffective portion of changes in fair value of the derivative, if any, is recognized immediately in other noninterest income or expense. The Bank assesses the effectiveness of each hedging relationship by comparing the cumulative changes in cash flows of the derivative hedging instruments with the cumulative changes in cash flows of the designated hedged item or transaction. No component of the change in the fair value of the hedging instrument is excluded from the assessment of hedge effectiveness. The Bank does not use derivatives for trading or speculative purposes. Earnings per share: Basic earnings per share is computed using the weighted average number of actual common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that would occur from the exercise of common stock options outstanding. ESOP shares are considered outstanding for this calculation unless unearned. On March 24, 2015, the Company declared a payment of a 2 -for-1 stock split of each issued and unissued share of the Company's common stock outstanding as of April 27, 2015. The additional shares were issued as a result of the stock split and were mailed to the shareholders as of May 4, 2015. All shares and earnings per share numbers have been restated for the stock split. The following table presents calculations of earnings per share: Year Ended December 31, 2015 2014 2013 (Amounts In Thousands, except share and per share data) Computation of weighted average number of basic and diluted shares: Common shares outstanding at the beginning of the year 9,380,432 9,455,250 9,424,656 Weighted average number of net shares redeemed (36,296 ) (67,022 ) (4,220 ) Weighted average shares outstanding (basic) 9,344,136 9,388,228 9,420,436 Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method 5,391 4,700 7,270 Weighted average number of shares (diluted) 9,349,527 9,392,928 9,427,706 Net income $ 28,418 $ 26,974 $ 25,931 Earnings per share: Basic $ 3.04 $ 2.88 $ 2.76 Diluted $ 3.04 $ 2.87 $ 2.75 Stock awards and options : Compensation expense for stock issued through the stock award plan is accounted for using the fair value method prescribed by FASB ASC 718, “Share-Based Payment” (“ASC 718”). Under this method, compensation expense is measured and recognized for all stock-based awards made to employees and directors based on the fair value of each option as of the date of the grant. Common stock held by ESOP : The Company's maximum cash obligation related to these shares is classified outside stockholders' equity because the shares are not readily traded and could be put to the Company for cash. Treasury Stock : Treasury stock is accounted for by the cost method, whereby shares of common stock reacquired are recorded at their purchase price. Trust Department Assets : Property held for customers in fiduciary or agency capacities is not included in the accompanying consolidated balance sheets, as such items are not assets of the Company. Effect of New Financial Accounting Standards : In May 2014, The FASB and International Accounting Standards Board (IASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of ASU 2014-09 is that a company should recognize revenue to depict the transfer of promised 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 currently reviewing the provisions of this standard to determine the application to financial institutions. In February 2015, the FASB issued ASU No. 2015-02 (Topic 810), Consolidation . The ASU modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIE) or voting interest entities (VOE). The standard relaxes existing criteria for determining when fees paid to a decision maker or service provider do not represent a variable interest by focusing on whether those fees are "at market". The ASU eliminates both the consolidation model specific to limited partnerships and the current presumption that a general partner controls a limited partnership. For public companies, ASU 2015-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Company is currently reviewing the provisions of this standard to determine the impact on the Company's financial statements. In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30), Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. For public companies, ASU 2015-03 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company has determined that the adoption of ASU 2015-03 will not have a material impact on the Company's financial statements. In April 2015, the FASB issued ASU No. 2015-05, Intangibles – Goodwill and Other Internal-Use Software (Subtopic 350-40), Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. ASU 2015-05 provides guidance to customers about whether a cloud computing arrangement includes a software license. If it does, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. The adoption of ASU 2015-05 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.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The carrying values of investment securities at December 31, 2015 and December 31, 2014 are summarized in the following table (Amounts in Thousands): December 31, 2015 December 31, 2014 Amount Percent Amount Percent Securities available for sale U.S. Treasury $ 24,978 9.45 % $ 22,333 8.62 % Other securities (FHLB, FHLMC and FNMA) 65,328 24.72 % 67,691 26.14 % State and political subdivisions 173,929 65.83 % 168,968 65.24 % Total securities available for sale $ 264,235 100.00 % $ 258,992 100.00 % Investment securities have been classified in the consolidated balance sheets according to management’s intent. Available-for-sale securities consist of debt securities not classified as trading or held to maturity. Available-for-sale securities are stated at fair value, and unrealized holding gains and losses, net of the related deferred tax effect, are reported as a separate component of stockholders’ equity. The Company had no securities designated as trading or held to maturity in its portfolio at December 31, 2015 or 2014 . The carrying amount of available-for-sale securities and their approximate fair values were as follows (Amounts in Thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value December 31, 2015: U.S. Treasury $ 24,893 $ 92 $ (7 ) $ 24,978 Other securities (FHLB, FHLMC and FNMA) 65,400 81 (153 ) 65,328 State and political subdivisions 171,698 2,375 (144 ) 173,929 Total $ 261,991 $ 2,548 $ (304 ) $ 264,235 December 31, 2014: U.S. Treasury $ 22,351 $ 18 $ (36 ) $ 22,333 Other securities (FHLB, FHLMC and FNMA) 67,644 147 (100 ) 67,691 State and political subdivisions 166,925 2,499 (456 ) 168,968 Total $ 256,920 $ 2,664 $ (592 ) $ 258,992 The amortized cost and estimated fair value of available-for-sale securities classified according to their contractual maturities at December 31, 2015 , were as follows (Amounts in Thousands): Amortized Cost Fair Value Due in one year or less $ 42,538 $ 42,577 Due after one year through five years 146,953 148,176 Due after five years through ten years 70,672 71,653 Due over ten years 1,828 1,829 Total $ 261,991 $ 264,235 As of December 31, 2015 , investment securities with a carrying value of $69.52 million were pledged to collateralize repurchase agreements, derivative financial instruments and other borrowings. Sales proceeds and gross realized gains and losses on available-for-sale securities were as follows (Amounts in Thousands): 2015 2014 2013 Sales proceeds $ — $ — $ 566 Gross realized gains — — 17 Gross realized losses — — — The following table shows the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2015 and 2014 (Amounts in Thousands): Less than 12 months 12 months or more Total 2015 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 3 $ 7,455 $ (7 ) 0.09 % — $ — $ — — % 3 $ 7,455 $ (7 ) 0.09 % Other securities (FHLB, FHLMC and FNMA) 15 36,830 (153 ) 0.42 % — — — — % 15 36,830 (153 ) 0.42 % State and political subdivisions 56 13,557 (70 ) 0.52 % 27 5,633 (74 ) 1.31 % 83 19,190 (144 ) 0.75 % Total temporarily impaired securities 74 $ 57,842 $ (230 ) 0.40 % 27 $ 5,633 $ (74 ) 1.31 % 101 $ 63,475 $ (304 ) 0.48 % Less than 12 months 12 months or more Total 2014 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 5 $ 12,396 $ (36 ) 0.29 % — $ — $ — — % 5 $ 12,396 $ (36 ) 0.29 % Other securities (FHLB, FHLMC and FNMA) 10 24,382 (100 ) 0.41 — — — — 10 24,382 (100 ) 0.41 % State and political subdivisions 91 21,724 (124 ) 0.57 78 16,154 (332 ) 2.06 169 37,878 (456 ) 1.20 % Total temporarily impaired securities 106 $ 58,502 $ (260 ) 0.44 % 78 $ 16,154 $ (332 ) 2.06 % 184 $ 74,656 $ (592 ) 0.79 % The Company considered the following information in reaching the conclusion that the impairments disclosed in the table above are temporary and not other-than-temporary impairments. None of the unrealized losses in the above table was due to the deterioration in credit quality that might result in the non-collection of contractual principal and interest. The unrealized losses are due to changes in interest rates. The Company has not recognized any unrealized loss in income because management does not have the intent to sell the securities included in the previous table. Management has concluded that it is more likely than not that the Company will not be required to sell these securities prior to recovery of the amortized cost basis.

Loans

Loans	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Loans	Loans Classes of loans are as follows: December 31, 2015 2014 (Amounts In Thousands) Agricultural $ 101,588 $ 97,645 Commercial and financial 184,199 174,738 Real estate: Construction, 1 to 4 family residential 51,346 45,949 Construction, land development and commercial 83,121 77,020 Mortgage, farmland 187,856 162,503 Mortgage, 1 to 4 family first liens 727,160 672,674 Mortgage, 1 to 4 family junior liens 117,873 110,284 Mortgage, multi-family 271,974 245,213 Mortgage, commercial 323,409 321,601 Loans to individuals 24,019 21,342 Obligations of state and political subdivisions 52,371 55,729 2,124,916 1,984,698 Net unamortized fees and costs 768 691 2,125,684 1,985,389 Less allowance for loan losses 26,510 24,020 $ 2,099,174 $ 1,961,369 Changes in the allowance for loan losses and the allowance for loan loss balance applicable to impaired loans and the related loan balance of impaired loans for the year ended December 31, 2015 , 2014 and 2013 are as follows: Agricultural Commercial and Financial Real Estate: Construction and land development Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family Real Estate: Mortgage, multi-family and commercial Other Total (Amounts In Thousands) 2015 Allowance for loan losses: Beginning balance $ 2,515 $ 4,231 $ 2,241 $ 2,672 $ 7,419 $ 4,195 $ 747 $ 24,020 Charge-offs (325 ) (526 ) (285 ) — (1,108 ) (723 ) (438 ) (3,405 ) Recoveries 123 1,370 501 6 762 1,310 168 4,240 Provision 769 (558 ) (177 ) 664 1,099 (559 ) 417 1,655 Ending balance $ 3,082 $ 4,517 $ 2,280 $ 3,342 $ 8,172 $ 4,223 $ 894 $ 26,510 Ending balance, individually evaluated for impairment $ 1 $ 324 $ 22 $ — $ 326 $ 110 $ 100 $ 883 Ending balance, collectively evaluated for impairment $ 3,081 $ 4,193 $ 2,258 $ 3,342 $ 7,846 $ 4,113 $ 794 $ 25,627 Loan balances: Ending balance $ 101,588 $ 184,199 $ 134,467 $ 187,856 $ 845,033 $ 595,383 $ 76,390 $ 2,124,916 Ending balance, individually evaluated for impairment $ 1,710 $ 2,110 $ 954 $ 2,233 $ 5,926 $ 3,228 $ 100 $ 16,261 Ending balance, collectively evaluated for impairment $ 99,878 $ 182,089 $ 133,513 $ 185,623 $ 839,107 $ 592,155 $ 76,290 $ 2,108,655 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) 2014 Allowance for loan losses: Beginning balance $ 2,852 $ 4,733 $ 2,918 $ 2,557 $ 7,064 $ 4,787 $ 639 $ 25,550 Charge-offs (174 ) (3,388 ) (250 ) — (1,195 ) (217 ) (325 ) (5,549 ) Recoveries 66 1,128 390 — 870 377 146 2,977 Provision (229 ) 1,758 (817 ) 115 680 (752 ) 287 1,042 Ending balance $ 2,515 $ 4,231 $ 2,241 $ 2,672 $ 7,419 $ 4,195 $ 747 $ 24,020 Ending balance, individually evaluated for impairment $ 44 $ 9 $ 28 $ 12 $ 52 $ 9 $ — $ 154 Ending balance, collectively evaluated for impairment $ 2,471 $ 4,222 $ 2,213 $ 2,660 $ 7,367 $ 4,186 $ 747 $ 23,866 Loan balances: Ending balance $ 97,645 $ 174,738 $ 122,969 $ 162,503 $ 782,958 $ 566,814 $ 77,071 $ 1,984,698 Ending balance, individually evaluated for impairment $ 1,844 $ 2,709 $ 560 $ 2,318 $ 3,826 $ 9,512 $ — $ 20,769 Ending balance, collectively evaluated for impairment $ 95,801 $ 172,029 $ 122,409 $ 160,185 $ 779,132 $ 557,302 $ 77,071 $ 1,963,929 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) 2013 Allowance for loan losses: Beginning balance $ 1,653 $ 4,573 $ 3,175 $ 1,746 $ 8,088 $ 5,104 $ 821 $ 25,160 Charge-offs — (1,692 ) (245 ) — (887 ) (356 ) (166 ) (3,346 ) Recoveries 35 1,002 323 — 618 464 163 2,605 Provision 1,164 850 (335 ) 811 (755 ) (425 ) (179 ) 1,131 Ending balance $ 2,852 $ 4,733 $ 2,918 $ 2,557 $ 7,064 $ 4,787 $ 639 $ 25,550 Ending balance, individually evaluated for impairment $ 3 $ 16 $ — $ 14 $ 66 $ 205 $ — $ 304 Ending balance, collectively evaluated for impairment $ 2,849 $ 4,717 $ 2,918 $ 2,543 $ 6,998 $ 4,582 $ 639 $ 25,246 Loan balances: Ending balance $ 82,138 $ 166,102 $ 99,491 $ 142,685 $ 711,472 $ 559,277 $ 64,991 $ 1,826,156 Ending balance, individually evaluated for impairment $ 120 $ 2,407 $ 1,410 $ 284 $ 4,542 $ 17,763 $ — $ 26,526 Ending balance, collectively evaluated for impairment $ 82,018 $ 163,695 $ 98,081 $ 142,401 $ 706,930 $ 541,514 $ 64,991 $ 1,799,630 The Company evaluates the following loans to determine impairment: 1) all nonaccrual and TDR loans, 2) all non consumer and non 1 to 4 family residential loans with prior charge-offs, 3) all non consumer and non 1 to 4 family loan relationships classified as substandard and 4) loans with indications of or suspected deteriorating credit quality. The following table presents the credit quality indicators by type of loans in each category as of December 31, 2015 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2015 Grade: Excellent $ 1,786 $ 3,298 $ — $ 260 Good 15,959 38,764 1,898 11,570 Satisfactory 36,819 102,188 34,357 52,731 Monitor 18,064 27,181 8,684 11,550 Special Mention 25,356 8,231 5,842 6,542 Substandard 3,604 4,537 565 468 Total $ 101,588 $ 184,199 $ 51,346 $ 83,121 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 2015 Grade: Excellent $ 2,559 $ 426 $ — $ 6,651 Good 31,186 15,773 2,992 64,002 Satisfactory 112,038 620,731 107,091 166,193 Monitor 27,304 55,499 4,198 29,732 Special Mention 11,181 16,237 1,846 4,873 Substandard 3,588 18,494 1,746 523 Total $ 187,856 $ 727,160 $ 117,873 $ 271,974 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2015 Grade: Excellent $ 12,484 $ — $ 2,365 $ 29,829 Good 81,305 70 37,045 300,564 Satisfactory 187,728 23,197 12,425 1,455,498 Monitor 32,141 285 518 215,156 Special Mention 6,183 198 — 86,489 Substandard 3,568 269 18 37,380 Total $ 323,409 $ 24,019 $ 52,371 $ 2,124,916 The following table presents the credit quality indicators by type of loans in each category as of December 31, 2014 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2014 Grade: Excellent $ 1,375 $ 4,820 $ — $ 276 Good 13,214 37,941 6,893 13,875 Satisfactory 51,107 94,158 27,738 47,852 Monitor 15,243 20,445 8,435 2,811 Special Mention 13,070 11,031 1,881 11,870 Substandard 3,636 6,343 1,002 336 Total $ 97,645 $ 174,738 $ 45,949 $ 77,020 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 2014 Grade: Excellent $ 2,867 $ 474 $ — $ 7,011 Good 36,680 22,094 2,875 73,852 Satisfactory 103,552 571,546 99,095 111,650 Monitor 11,754 41,805 3,377 35,812 Special Mention 4,721 18,428 2,520 16,611 Substandard 2,929 18,327 2,417 277 Total $ 162,503 $ 672,674 $ 110,284 $ 245,213 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2014 Grade: Excellent $ 15,416 $ 87 $ 2,440 $ 34,766 Good 87,612 94 43,108 338,238 Satisfactory 178,069 20,465 10,181 1,315,413 Monitor 25,165 251 — 165,098 Special Mention 9,371 353 — 89,856 Substandard 5,968 92 — 41,327 Total $ 321,601 $ 21,342 $ 55,729 $ 1,984,698 The below are descriptions of the credit quality indicators: Excellent - Excellent rated loans are prime quality loans covered by highly-liquid collateral with generous margins or supported by superior current financial conditions reflecting substantial net worth, relative to total credit extended, and based on assets of a stable and non-speculative nature whose values can be readily verified. Identified repayment source or cash flow is abundant and assured. Good - Good rated loans are adequately secured by readily-marketable collateral or good financial condition characterized by liquidity, flexibility and sound net worth. Loans are supported by sound primary and secondary payment sources and timely and accurate financial information. Satisfactory – Satisfactory rated loans are loans to borrowers of average financial means not especially vulnerable to changes in economic or other circumstances, where the major support for the extension is sufficient collateral of a marketable nature, and the primary source of repayment is seen to be clear and adequate. Monitor – Monitor rated loans are identified by management as warranting special attention for a variety of reasons that may bear on ultimate collectability. This may be due to adverse trends, a particular industry, loan structure, or repayment that is dependent on projections, or a one-time occurrence. Special Mention – Special mention rated loans are supported by a marginal payment capacity and are marginally protected by collateral. There are identified weaknesses that if not monitored and corrected may adversely affect the Company’s credit position. A special mention credit would typically have a weakness in one of the general categories (cash flow, collateral position or payment history) but not in all categories. Substandard – Substandard loans are not adequately supported by the paying capacity of the borrower and may be inadequately collateralized. These loans have a well-defined weakness or weaknesses. For these loans, it is more probable than not that the Company could sustain some loss if the deficiency(ies) is not corrected. Past due loans as of December 31, 2015 and 2014 were as follows: 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Accruing Loans Past Due 90 Days or More (Amounts In Thousands) December 31, 2015 Agricultural $ 3,064 $ 961 $ — $ 4,025 $ 97,563 $ 101,588 $ — Commercial and financial 854 71 1,312 2,237 181,962 184,199 — Real estate: Construction, 1 to 4 family residential — — 214 214 51,132 51,346 — Construction, land development and commercial — — 88 88 83,033 83,121 — Mortgage, farmland 320 88 — 408 187,448 187,856 — Mortgage, 1 to 4 family first liens 4,526 1,192 2,085 7,803 719,357 727,160 406 Mortgage, 1 to 4 family junior liens 250 13 110 373 117,500 117,873 — Mortgage, multi-family 135 — 113 248 271,726 271,974 — Mortgage, commercial 1,033 — 331 1,364 322,045 323,409 61 Loans to individuals 158 40 — 198 23,821 24,019 — Obligations of state and political subdivisions — — — — 52,371 52,371 — $ 10,340 $ 2,365 $ 4,253 $ 16,958 $ 2,107,958 $ 2,124,916 $ 467 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Accruing Loans Past Due 90 Days or More (Amounts In Thousands) December 31, 2014 Agricultural $ 310 $ 99 $ — $ 409 $ 97,236 $ 97,645 $ — Commercial and financial 397 14 1,048 1,459 173,279 174,738 — Real estate: Construction, 1 to 4 family residential — — — — 45,949 45,949 — Construction, land development and commercial 937 — — 937 76,083 77,020 — Mortgage, farmland 753 — — 753 161,750 162,503 — Mortgage, 1 to 4 family first liens 3,594 1,656 1,582 6,832 665,842 672,674 348 Mortgage, 1 to 4 family junior liens 181 12 244 437 109,847 110,284 — Mortgage, multi-family — 21 — 21 245,192 245,213 — Mortgage, commercial 359 557 34 950 320,651 321,601 — Loans to individuals 27 — — 27 21,315 21,342 — Obligations of state and political subdivisions — — — — 55,729 55,729 — $ 6,558 $ 2,359 $ 2,908 $ 11,825 $ 1,972,873 $ 1,984,698 $ 348 The Company does not have a significant amount of loans that are past due less than 90 days where there are serious doubts as to the ability of the borrowers to comply with the loan repayment terms. Accruing loans past due 90 days or more increased $0.12 million from December 31, 2014 to December 31, 2015 . As of December 31, 2015 and 2014 , accruing loans past due 90 days or more were 0.02% and 0.02% of total loans, respectively. The average balance of the past due loans also increased in 2015 as compared to 2014 . The average 90 days or more past due loan balance per loan was $0.09 million as of December 31, 2015 compared to $0.07 million as of December 31, 2014 . The loans 90 days or more past due and still accruing are believed to be adequately collateralized. Loans are placed on nonaccrual status when management believes the collection of future principal and interest is not reasonably assured. Certain impaired loan information by loan type at December 31, 2015 and 2014 was as follows: December 31, 2015 December 31, 2014 Nonaccrual loans (1) Accruing loans past due 90 days or more TDR loans Nonaccrual loans (1) Accruing loans past due 90 days or more TDR loans (Amounts In Thousands) (Amounts In Thousands) Agricultural $ — $ — $ 1,710 $ — $ — $ 1,942 Commercial and financial 1,498 — 612 1,343 — 1,366 Real estate: Construction, 1 to 4 family residential 214 — 473 — — 431 Construction, land development and commercial 145 — 122 127 — — Mortgage, farmland — — 2,233 — — 2,220 Mortgage, 1 to 4 family first liens 3,845 406 1,369 1,912 348 1,199 Mortgage, 1 to 4 family junior liens 279 — 27 369 — — Mortgage, multi-family 449 — — 55 — 5,470 Mortgage, commercial 985 61 1,733 2,275 — 1,712 Loans to individuals — — — — — — $ 7,415 $ 467 $ 8,279 $ 6,081 $ 348 $ 14,340 (1) There were $2.31 million and $2.14 million of TDR loans included within nonaccrual loans as of December 31, 2015 and 2014 , respectively. The Company may modify the terms of a loan to maximize the collection of amounts due. In most cases, the modification is a reduction in interest rate, conversion to interest only payments or an extension of the maturity date. The borrower is experiencing financial difficulties or is expected to experience financial difficulties in the near-term, so a concessionary modification is granted to the borrower that would otherwise not be considered. TDR loans accrue interest as long as the borrower complies with the revised terms and conditions and has demonstrated repayment performance at a level commensurate with the modified terms over several payment cycles. Below is a summary of information for TDR loans as of December 31, 2015 and 2014 : December 31, 2015 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 7 $ 1,710 $ 32 Commercial and financial 8 1,818 241 Real estate: Construction, 1 to 4 family residential 3 646 138 Construction, land development and commercial 1 122 — Mortgage, farmland 5 2,233 — Mortgage, 1 to 4 family first liens 13 1,575 — Mortgage, 1 to 4 family junior liens 2 36 — Mortgage, multi-family 1 71 — Mortgage, commercial 10 2,381 — Loans to individuals — — — 50 $ 10,592 $ 411 December 31, 2014 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 9 $ 1,942 $ 272 Commercial and financial 13 2,202 53 Real estate: Construction, 1 to 4 family residential 3 431 111 Construction, land development and commercial 1 127 — Mortgage, farmland 4 2,220 — Mortgage, 1 to 4 family first liens 11 1,467 — Mortgage, 1 to 4 family junior liens 1 225 65 Mortgage, multi-family 2 5,470 — Mortgage, commercial 8 2,398 — Loans to individuals — — — 52 $ 16,482 $ 501 A summary of TDR loans that were modified during the year ended December 31, 2015 and 2014 was as follows: December 31, 2015 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 3 $ 279 $ 163 Commercial and financial 2 676 663 Real estate: Construction, 1 to 4 family residential 1 277 277 Construction, land development and commercial — — — Mortgage, farmland 2 513 399 Mortgage, 1 to 4 family first liens 4 353 353 Mortgage, 1 to 4 family junior liens 2 41 41 Mortgage, multi-family 1 71 71 Mortgage, commercial 2 144 144 Loans to individuals — — — 17 $ 2,354 $ 2,111 December 31, 2014 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 8 $ 2,033 $ 2,033 Commercial and financial 5 803 803 Real estate: Construction, 1 to 4 family residential 3 443 431 Construction, land development and commercial 1 132 132 Mortgage, farmland 3 2,007 2,007 Mortgage, 1 to 4 family first liens 3 433 433 Mortgage, 1 to 4 family junior liens 1 225 225 Mortgage, multi-family — — — Mortgage, commercial 1 319 319 Loans to individuals — — — 25 $ 6,395 $ 6,383 The Bank has commitments to lend additional borrowings to TDR loan customers. These commitments are in the normal course of business and allow the borrowers to build pre-sold homes and commercial property which increase their overall cash flow. The additional borrowings are not used to facilitate payments on these loans. There were no TDR loans modified during the year that were in payment default (defined as past due 90 days or more) as of December 31, 2015 or 2014 . Information regarding impaired loans as of and for the year ended December 31, 2015 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2015 With no related allowance recorded: Agricultural $ 1,609 $ 1,773 $ — $ 1,620 $ 80 Commercial and financial 1,263 1,981 — 1,421 5 Real estate: Construction, 1 to 4 family residential 238 238 — 173 5 Construction, land development and commercial 210 314 — 231 6 Mortgage, farmland 2,233 2,351 — 2,305 110 Mortgage, 1 to 4 family first liens 3,558 4,419 — 3,806 48 Mortgage, 1 to 4 family junior liens 189 500 — 204 — Mortgage, multi-family 157 226 — 175 — Mortgage, commercial 1,831 3,018 — 1,839 50 Loans to individuals — 20 — — — $ 11,288 $ 14,840 $ — $ 11,774 $ 304 With an allowance recorded: Agricultural $ 101 $ 101 $ 1 $ 106 $ 5 Commercial and financial 847 847 324 990 30 Real estate: Construction, 1 to 4 family residential 449 461 9 449 12 Construction, land development and commercial 57 58 13 58 — Mortgage, farmland — — — — — Mortgage, 1 to 4 family first liens 2,062 2,156 306 2,133 36 Mortgage, 1 to 4 family junior liens 117 270 20 179 1 Mortgage, multi-family 292 332 58 316 — Mortgage, commercial 948 1,030 52 974 38 Loans to individuals 100 100 100 67 4 $ 4,973 $ 5,355 $ 883 $ 5,272 $ 126 Total: Agricultural $ 1,710 $ 1,874 $ 1 $ 1,726 $ 85 Commercial and financial 2,110 2,828 324 2,411 35 Real estate: Construction, 1 to 4 family residential 687 699 9 622 17 Construction, land development and commercial 267 372 13 289 6 Mortgage, farmland 2,233 2,351 — 2,305 110 Mortgage, 1 to 4 family first liens 5,620 6,575 306 5,939 84 Mortgage, 1 to 4 family junior liens 306 770 20 383 1 Mortgage, multi-family 449 558 58 491 — Mortgage, commercial 2,779 4,048 52 2,813 88 Loans to individuals 100 120 100 67 4 $ 16,261 $ 20,195 $ 883 $ 17,046 $ 430 Information regarding impaired loans as of and for the year ended December 31, 2014 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2014 With no related allowance recorded: Agricultural $ 1,634 $ 1,696 $ — $ 1,496 $ 71 Commercial and financial 2,076 3,695 — 1,930 29 Real estate: Construction, 1 to 4 family residential 89 89 — 44 1 Construction, land development and commercial 128 220 — 142 — Mortgage, farmland 2,040 2,040 — 1,897 90 Mortgage, 1 to 4 family first liens 2,951 3,705 — 2,980 47 Mortgage, 1 to 4 family junior liens 369 673 — 386 — Mortgage, multi-family 5,525 5,632 — 5,598 249 Mortgage, commercial 3,290 4,588 — 3,534 53 Loans to individuals — 20 — — — $ 18,102 $ 22,358 $ — $ 18,007 $ 540 With an allowance recorded: Agricultural $ 210 $ 247 $ 44 $ 220 $ 11 Commercial and financial 633 633 9 694 36 Real estate: Construction, 1 to 4 family residential 343 354 28 348 19 Construction, land development and commercial — — — — — Mortgage, farmland 278 278 12 281 14 Mortgage, 1 to 4 family first liens 506 596 52 526 22 Mortgage, 1 to 4 family junior liens — — — — — Mortgage, multi-family — — — — — Mortgage, commercial 697 697 9 706 37 Loans to individuals — — — — — $ 2,667 $ 2,805 $ 154 $ 2,775 $ 139 Total: Agricultural $ 1,844 $ 1,943 $ 44 $ 1,716 $ 82 Commercial and financial 2,709 4,328 9 2,624 65 Real estate: Construction, 1 to 4 family residential 432 443 28 392 20 Construction, land development and commercial 128 220 — 142 — Mortgage, farmland 2,318 2,318 12 2,178 104 Mortgage, 1 to 4 family first liens 3,457 4,301 52 3,506 69 Mortgage, 1 to 4 family junior liens 369 673 — 386 — Mortgage, multi-family 5,525 5,632 — 5,598 249 Mortgage, commercial 3,987 5,285 9 4,240 90 Loans to individuals — 20 — — — $ 20,769 $ 25,163 $ 154 $ 20,782 $ 679 Information regarding impaired loans as of and for the year ended December 31, 2013 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2013 With no related allowance recorded: Agricultural $ — $ — $ — $ — $ — Commercial and financial 1,602 3,140 — 1,645 45 Real estate: Construction, 1 to 4 family residential 1,270 2,974 — 1,727 4 Construction, land development and commercial 140 140 — 229 — Mortgage, farmland — — — — — Mortgage, 1 to 4 family first liens 2,597 3,542 — 2,691 24 Mortgage, 1 to 4 family junior liens 177 451 — 198 — Mortgage, multi-family 456 1,068 — 666 — Mortgage, commercial 2,494 5,303 — 2,793 46 Loans to individuals — 20 — — — $ 8,736 $ 16,638 $ — $ 9,949 $ 119 With an allowance recorded: Agricultural $ 120 $ 120 $ 3 $ 123 $ 5 Commercial and financial 805 838 16 871 46 Real estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — — — — Mortgage, farmland 284 284 14 289 14 Mortgage, 1 to 4 family first liens 1,768 1,897 66 1,821 79 Mortgage, 1 to 4 family junior liens — — — — — Mortgage, multi-family 5,608 5,608 188 5,673 255 Mortgage, commercial 9,205 9,205 17 9,300 535 Loans to individuals — — — — — $ 17,790 $ 17,952 $ 304 $ 18,077 $ 934 Total: Agricultural $ 120 $ 120 $ 3 $ 123 $ 5 Commercial and financial 2,407 3,978 16 2,516 91 Real estate: Construction, 1 to 4 family residential 1,270 2,974 — 1,727 4 Construction, land development and commercial 140 140 — 229 — Mortgage, farmland 284 284 14 289 14 Mortgage, 1 to 4 family first liens 4,365 5,439 66 4,512 103 Mortgage, 1 to 4 family junior liens 177 451 — 198 — Mortgage, multi-family 6,064 6,676 188 6,339 255 Mortgage, commercial 11,699 14,508 17 12,093 581 Loans to individuals — 20 — — — $ 26,526 $ 34,590 $ 304 $ 28,026 $ 1,053 Impaired loans decreased by $4.61 million from December 31, 2014 to December 31, 2015 . 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 Bank expects to be unable to collect in full according to the contractual terms of the original loan agreement. The decrease in impaired loans is due mainly to a decrease in TDR Loans of $6.06 million from December 31, 2014 to December 31, 2015 . The net decrease in TDR loans is primarily the result of loans reclassified from TDR loans as a result of the borrowers not experiencing financial difficulty and no concessions granted to the borrower when the loan was modified during the year ended December 31, 2015 . For loans that are collateral dependent, losses are evaluated based on the portion of a loan that exceeds the fair market value of the collateral that can be identified as uncollectible. In general, this is the amount that the carrying value of the loan exceeds the related appraised value. Generally, it is the Company’s policy not to rely on appraisals that are older than one year prior to the date the impairment is being measured. The most recent appraisal values may be adjusted if, in the Company’s judgment, experience and other market data indicate that the property’s value, use, condition, exit market or other variable affecting its value may have changed since the appraisal was performed, consistent with the December 2006 joint interagency guidance on the allowance for loan losses. The charge-off or loss adjustment supported by an appraisal is considered the minimum charge-off. Any adjustments made to the appraised value are to provide additional charge-off or loss allocations based on the applicable facts and circumstances. In instances where there is an estimated decline in value, either a loss allocation is provided or a charge-off taken pending confirmation of the amount of the loss from an updated appraisal. Upon receipt of the new appraisals, an additional loss allocation may be provided or charge-off taken based on the appraised value of the collateral. On average, appraisals are obtained within one month of order. The Company has not experienced any significant time lapses in recognizing the required provisions for collateral dependent loans, nor has the Company delayed appropriate charge-offs. When an updated appraisal value has been obtained, the Company has used the appraisal amount in helping to determine the appropriate charge-off or required reserve. The Company also evaluates any changes in the financial condition of the borrower and guarantors (if applicable), economic conditions, and the Company’s loss experience with the type of property in question. Any information utilized in addition to the appraisal is intended to identify additional charge-offs or provisions, not to override the appraised value. The Company separates its portfolio loans and leases into segments for determining the allowance for loan losses. The Company's portfolio segments includes agricultural, commercial and financial, real estate, loans to individuals and obligations of state and political subdivisions. The Company further separates its portfolio into classes for purposes of monitoring and assessing credit quality based on certain risk characteristics. Classes with the real estate portfolio segment includes 1 to 4 family residential constructions, land development and commercial construction, farmland, 1 to 4 family first liens, 1 to 4 family junior liens, multi-family and commercial. Loans that exhibit probable or observed credit weaknesses, as well as loans that have been modified in a TDR, are subject to individual review for impairment. When individual loans are reviewed for impairment, the Company determines allowances based on management's estimate of the borrower's ability to repay the loan given the availability of the collateral, other sources of cash flow, as well as evaluation of legal options available. Allowances for impaired loans are measured based on the present value of expected future cash flows discounted at the loan's effective interest rate or the fair value of the underlying collateral. Historical loss rates are applied to loans that are not individually reviewed for impairment. For reporting periods prior to December 31, 2014 the Company calculated its historical loss experience using a trailing 10 quarter portfolio loss history method in which the Company tracked the net charge-offs as a percentage of total loans by loan category. The portfolio loss history method did not factor in the credit risk ratings of the loans in determination of the historical loss rate to be applied in the allowance for loan losses calculation. During the year ended December 31, 2014, to refine the Company's allowance for loan losses calculation, management performed a 20 quarter migration analysis. Management determined that increasing the look-back period to a 20 quarter period would improve the estimation of the entire credit and economic cycle of a credit relationship. The migration analysis performed by management uses loan level attributes to track the movement of loans through the various credit risk rating categories in order to estimate the percentage of historical loss to apply to each specific credit risk rating in each loan category. The credit risk rating system currently utilized for allowance analysis purposes encompasses six categories. The Company's allowance for loan loss methodology incorporates a variety of risk considerations, both quantitative and qualitative, in establishing an allowance for loan losses that management believes is appropriate at each reporting date. Quantitative factors include the Company's historical loss experience, delinquency and charge-off trends, collateral values, changes in impaired loans, and other factors. Quantitative factors also incorporate known information about individual loans, including borrowers' sensitivity to interest rate movements. Qualitative factors include changes in lending policies and procedures; changes in national and local economic and business conditions; changes in the nature and volume of the loan portfolio; changes in the experience, ability and depth of lending management and staff; changes in the quality of the Bank's loan review system; the existence and effect of concentrations of credit; and the effect of any other identified external factors. Determinations relating to the possible level of future loan losses are based in part on subjective judgments by management. Future loan losses in excess of current estimates, could materially adversely affect our results of operations or financial position. As the Company adds new products and increases the complexity of its loan portfolio, it will enhance its methodology accordingly. Although management believes the levels of the allowance for loan losses as of December 31, 2015 and 2014 were adequate to absorb probable losses inherent in the loan portfolio, a decline in local economic conditions, or other factors, could result in increasing losses that cannot be reasonably predicted at this time.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment The major classes of property and equipment and the total accumulated depreciation are as follows: December 31, 2015 2014 (Amounts In Thousands) Land $ 8,996 $ 7,835 Buildings and improvements 33,178 29,402 Furniture and equipment 29,549 27,298 71,723 64,535 Less accumulated depreciation 38,201 35,464 Net $ 33,522 $ 29,071

Interest-Bearing Deposits

Interest-Bearing Deposits	12 Months Ended
	Dec. 31, 2015
Interest-bearing Deposit Liabilities [Abstract]
Interest-Bearing Deposits	Interest - Bearing Deposits A summary of these deposits is as follows: December 31, 2015 2014 (Amounts In Thousands) NOW and other demand $ 477,241 $ 450,486 Savings 644,115 588,781 Time, $100,000 and over 157,331 177,795 Other time 297,047 329,289 $ 1,575,734 $ 1,546,351 Brokered deposits totaled $62.74 million and $64.49 million as of December 31, 2015 and 2014 , respectively with an average interest rate of 0.42% and 0.39% as of December 31, 2015 and 2014 , respectively. As of December 31, 2015 , brokered deposits of $54.01 million are included in savings deposits and $8.73 million are included in time deposits. At December 31, 2014 , brokered deposits of $55.48 million were included in savings deposits and $9.01 million were included in time deposits. Brokered time deposits in increments greater than $100,000 as of December 31, 2015 and 2014 were $6.97 million and $7.25 million , respectively. Time deposits have a maturity as follows: December 31, 2015 2014 (Amounts In Thousands) Due in one year or less $ 195,369 $ 243,316 Due after one year through two years 113,438 128,927 Due after two years through three years 73,845 74,493 Due after three years through four years 21,821 43,490 Due over four years 49,905 16,858 $ 454,378 $ 507,084

Other Borrowings

Other Borrowings	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
Other Borrowings	Other Borrowings The following table sets forth selected information for other borrowings each of which having a maturity of less than one year: December 31, 2015 2014 (Amounts In Thousands) Federal funds purchased, secured by other securities (FHLB, FHLMC and FNMA) $ — $ 6,945 Repurchase agreements with customers, renewable daily, interest payable monthly, secured by other securities (FHLB, FHLMC and FNMA) 44,051 40,554 $ 44,051 $ 47,499 The weighted average interest rate on other borrowings outstanding as of December 31, 2015 and 2014 was 0.25% and 0.26% , respectively. Customer repurchase agreements are used by the Bank to acquire funds from customers where the customer is required or desires to have their funds supported by collateral consisting of investment securities. The repurchase agreement is a commitment to sell these securities to a customer at a certain price and repurchase them at a future date at that same price plus interest accrued at an agreed upon rate. The Bank uses customer repurchase agreements in its liquidity plan as well as an accommodation to customers. At December 31, 2015 , $44.05 million of securities sold under repurchase agreements with a weighted average interest rate of 0.26% , maturing in 2015 , were collateralized by investment securities having an amortized cost of $59.51 million . As of December 31, 2015 and 2014 , all of the Company's sales of securities under agreements to repurchase had overnight contractual maturities. The securities underlying the agreements are book-entry securities issues by U.S. government sponsored agencies, held in safekeeping with a third party custodian and pledged to the depositors under a written custodial agreement that explicitly recognizes the depositors' interest in the securities.

Federal Home Loan Bank Borrowin

Federal Home Loan Bank Borrowings	12 Months Ended
	Dec. 31, 2015
Federal Home Loan Banks [Abstract]
Federal Home Loan Bank Borrowings	Federal Home Loan Bank Borrowings As of December 31, 2015 and 2014 , the borrowings were as follows: 2015 2014 (Effective interest rates as of December 31, 2014) (Amounts In Thousands) Due 2015, 0.28% $ — $ 15,000 Due 2016, 4.46% to 4.66% 30,000 45,000 Due 2017, 4.09% to 4.89% 60,000 60,000 Due 2018, 3.65% 20,000 20,000 Due 2020, 3.05% 25,000 — Due 2025, 2.54% to 3.07% 90,000 — $ 225,000 $ 140,000 The $15.00 million borrowing due in 2015 was an overnight borrowing. The borrowings due in 2016, 2017 and 2018 are callable by the FHLB with call dates during 2016. The advances are unlikely to be called unless rates would increase significantly. The borrowings with the FHLB have prepayment fees associated with them; therefore, the Company cannot prepay without incurring fees. To participate in the FHLB advance program, the Company is required to have an investment in FHLB stock. The Company’s investment in FHLB stock was $11.83 million and $8.25 million at December 31, 2015 and 2014 , respectively. Collateral is provided by the Company’s 1 to 4 family mortgage loans totaling $303.75 million at December 31, 2015 and $189.00 million at December 31, 2014 . The Company also has the ability to borrow against commercial real estate and multi-family loans totaling $184.59 million as of December 31, 2015 and $185.28 million as of December 31, 2014 and there was $0 borrowed against this collateral as of December 31, 2015 or 2014 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2015
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The components of accumulated other comprehensive income (AOCI), included in stockholders’ equity, are as follows: December 31, 2015 2014 (amounts in thousands) Net unrealized gain on available-for-sale securities $ 2,244 $ 2,072 Net unrealized (loss) gain on derivatives used for cash flow hedges (4,180 ) (2,796 ) Tax effect 741 276 Net-of-tax amount $ (1,195 ) $ (448 ) Amounts reclassified from AOCI and the affected line items in the statements of income during the years ended December 31, 2015 , 2014 and 2013 , were as follows: Amounts reclassified from AOCI Affected Line Item in the Statements of Income 2015 2014 2013 (amounts in thousands) Unrealized gains (losses) on available-for-sale securities $ — $ — $ 17 Other noninterest income Tax effect — — (7 ) Tax (expense) benefit Total reclassification out of AOCI $ — $ — $ 10

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company has an Employee Stock Purchase Plan (the “ESPP”). For each quarterly offering period, eligible employees can elect to contribute from 1% to 15% of his or her compensation. The purchase price is the lesser of the fair market value on the first day of the offering period or the last day of the offering period. The maximum dollar amount any one employee can elect to contribute in a year is $10,000 . During the year ended December 31, 2015 , 4,155 shares of stock were purchased by employees of the Bank through the ESPP. 4,184 shares of stock were purchased by employees of the Bank through the ESPP for the year ended December 31, 2014 . The Company has an Employee Stock Ownership Plan (the "ESOP") to which it makes discretionary cash contributions. The Company's contribution to the ESOP totaled $1.72 million , $1.61 million and $1.57 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. The 2015 , 2014 and 2013 discretionary contribution rates were 9% of qualified salaries. During the year ended December 31, 2011, the ESOP purchased an additional 80,056 shares of common stock in the Company with a loan from the Company. The note payable bears interest at the prime rate subject to a floor of 5.0% with principal and interest payable annually for five consecutive years. The loan is collateralized by the unreleased shares of stock purchased as well as a certificate of deposit the Company holds at the Bank in the original amount of the note. The note payable and certificate of deposit are not included in the consolidated balance sheets. There was no interest income or expense recognized in the consolidated statements of income. The note was paid off during the year ended December 31, 2015 . When the note payable is repaid by the ESOP, shares are released from collateral and allocated to qualified employees based on the proportion of principal and interest paid in the year to total principal and interest payments anticipated for the life of the loan. The number of shares released from collateral totaled 15,256 , 16,004 and 16,720 shares for the years ended December 31, 2015 , 2014 and 2013 , respectively. The shares pledged as collateral are reported as a reduction of stockholder’s equity in the consolidated balance sheet. As shares are committed to be released from collateral, the Company reports compensation expense equal to the current market price of the shares, and the shares become outstanding for earnings per share computations. Compensation expense totaled $0.17 million , $0.13 million and $0.09 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Unallocated shares were 0 , 15,256 and 31,260 as of December 31, 2015 , 2014 and 2013 , respectively. Dividends on allocated ESOP shares were recorded as a reduction of retained earnings. Dividends on unallocated ESOP shares were used to reduce debt. In the event a terminated plan participant desires to sell his or her shares of the Company stock, or for certain employees who elect to diversify their account balances, the Company may be required to purchase the shares from the participant at their fair value. To the extent that shares of common stock held by the ESOP are not readily traded, a sponsor must reflect the maximum cash obligation related to those securities outside of stockholders' equity. The Company obtains a quarterly independent appraisal of the shares of stock. As of December 31, 2015 and 2014 , the shares held by the ESOP, fair value and maximum cash obligation were as follows: 2015 2014 Shares held by the ESOP 844,088 838,088 Fair value per share $ 44.50 $ 41.25 Maximum cash obligation $ 37,562,000 $ 34,571,000 The Company has a profit-sharing plan with a 401(k) feature, which provides for discretionary annual contributions in amounts to be determined by the Board of Directors. The Company did not make a profit sharing plan contribution in the years ended December 31, 2015 , 2014 , and 2013 . The Company made matching contributions under its 401(k) plan of $0.16 million in 2015 , $0.16 million in 2014 , and $0.15 million in 2013 and each such amount is included in salaries and employee benefits expense. The Company provides a deferred compensation program for executive officers. This program allows executive officers to elect to defer a portion of their salaried compensation for payment by the Company at a subsequent date. The executive officers can defer up to 30% of their base compensation and up to 100% of any bonus into the deferral plan. Any amount so deferred is credited to the executive officer’s deferred compensation account and converted to units equivalent in value to the fair market value of a share of stock in Hills Bancorporation. The “stock units” are book entry only and do not represent an actual purchase of stock. The executive officer’s account is adjusted each year for dividends paid and the change in the market value of Hills Bancorporation stock. The deferrals and earnings grow tax deferred until withdrawn from the plan. Earnings credited to the individual’s accounts are recorded as compensation expense when earned. The deferred compensation liability is recorded in other liabilities and totals $5.37 million and $5.04 million at December 31, 2015 and 2014 , respectively. Expense related to the deferred compensation plan was $0.49 million for 2015 , $0.54 million for 2014 and $0.39 million for 2013 and is included in salaries and employee benefits expense. The Company also provides a deferred compensation program for its Board of Directors. Under the plan, each director may elect to defer up to 50% of such director’s cash compensation from retainers and meeting fees for payment by the Company at a subsequent date. Any amount so deferred is credited to the director’s deferred compensation account and converted to units equivalent in value to the fair market value of a share of stock in Hills Bancorporation. The “stock units” are book entry only and do not represent an actual purchase of stock. The director’s account is adjusted each year for dividends paid and the change in the market value of Hills Bancorporation stock. The deferred compensation liability for the directors’ plan is recorded in other liabilities and totaled $2.44 million and $2.26 million at December 31, 2015 and 2014 , respectively. Expense related to the directors’ deferred compensation plan was $0.21 million for 2015 , $0.23 million for 2014 and $0.17 million for 2013 and is included in other noninterest expense. The Company has a Stock Option and Incentive Plan for certain key employees and directors whereby shares of common stock have been reserved for awards in the form of stock options or restricted stock awards. Under the plan, the aggregate number of options and shares granted cannot exceed 188,000 shares. A Stock Option Committee may grant options at prices equal to the fair value of the stock at the date of the grant. Options expire 10 years from the date of the grant. Director options and officers' rights under the plan vest over a five -year period from the date of the grant. A summary of the stock options is as follows: Number of Shares Weighted- Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (In Thousands) Balance, December 31, 2012 35,970 $ 23.81 4.25 $ 856 Granted — Exercised (10,710 ) Balance, December 31, 2013 25,260 26.98 4.72 681 Granted — Exercised (5,880 ) Balance, December 31, 2014 19,380 29.92 5.03 580 Granted — Exercised — Balance, December 31, 2015 19,380 $ 29.92 4.03 $ 580 There were no stock options granted in 2013, 2014 or 2015. The intrinsic value of options exercised was $0.00 million , $0.10 million and $0.18 million for 2015 , 2014 and 2013 , respectively. The fair value of each option is estimated as of the date of grant using a Black Scholes option pricing model. The expected lives of options granted incorporate historical employee exercise behavior. The risk-free rate for periods that coincide with the expected life of the options is based on the ten year interest rate swap rate as published by the Federal Reserve Bank on the date of issuance. Expected volatility is based on volatility levels of the Company’s peers’ common stock as the Company’s stock has limited trading activity. Expected dividend yield was based on historical dividend rates. Significant assumptions at date of grant include: 2015 2014 Risk-free interest rate n/a n/a Expected option life n/a n/a Expected volatility n/a n/a Expected dividends n/a n/a Other pertinent information related to the options outstanding at December 31, 2015 is as follows: Exercise Price Number Outstanding Remaining Contractual Life Number Exercisable $ 26.00 9,160 16 months 9,160 33.00 7,220 76 months — 34.50 3,000 82 months — 19,380 9,160 As of December 31, 2015 , the outstanding options have a weighted-average exercise price of $29.92 per share and a weighted average remaining contractual term of 4.03 years. There was $0.04 million in unrecognized compensation cost for stock options granted under the plan as of December 31, 2015 . This cost is expected to be recognized over a weighted-average period of 1.45 years. As of December 31, 2015 , the vested options totaled 9,160 shares with a weighted-average exercise price of $26.00 per share and a weighted-average remaining contractual term of 1.33 years. As of December 31, 2015 , 104,740 shares were available for stock options and awards. The Compensation and Incentive Stock Committee is also authorized to grant awards of restricted common stock, and it authorized the issuance of 18,314 shares of common stock in 2015 , 19,144 shares in 2014 and 7,168 shares in 2013 to certain employees. The vesting period for these awards is five years and the Bank amortizes the expense on a straight line basis during the vesting period. The expense relating to these awards for the years ended December 31, 2015 , 2014 and 2013 was $0.39 million , $0.26 million and $0.21 million , respectively. 10,800 shares of the restricted common stock shares awarded in December 31, 2015 and 2014 are subject to forfeiture upon termination of the employee's employment with the Company within eight years of the award.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income taxes for the years ended December 31, 2015 , 2014 and 2013 are summarized as follows: 2015 2014 2013 (Amounts In Thousands) Current: Federal $ 11,559 $ 9,412 $ 9,120 State 2,202 1,788 1,789 Deferred: Federal (1,114 ) (27 ) (78 ) State (178 ) (44 ) 81 $ 12,469 $ 11,129 $ 10,912 Temporary differences between the amounts reported in the consolidated financial statements and the tax basis of assets and liabilities result in deferred taxes. Deferred tax assets and liabilities at December 31, 2015 and 2014 were as follows: December 31, 2015 2014 (Amounts In Thousands) Deferred income tax assets: Allowance for loan losses $ 10,140 $ 9,188 Deferred compensation 2,909 2,718 Unrealized losses on interest rate swaps 1,599 1,069 Accrued expenses 1,140 1,099 State net operating loss 708 600 Gross deferred tax assets $ 16,496 $ 14,674 Valuation allowance (708 ) (600 ) Deferred tax asset, net of valuation allowance $ 15,788 $ 14,074 Deferred income tax liabilities: Property and equipment 1,910 1,878 Unrealized gains on investment securities 858 793 Goodwill 624 624 Other 701 841 Gross deferred tax liabilities $ 4,093 $ 4,136 Net deferred tax assets $ 11,695 $ 9,938 The Company has recorded a deferred tax asset for the future tax benefits of Iowa net operating loss carry-forwards. The net operating loss carry-forwards are generated by the Company largely from its investment in tax credit real estate properties. The Company is required to file a separate Iowa tax return and cannot be consolidated with the Bank. The net operating loss carry-forwards will expire, if not utilized, between 2016 and 2035 . The Company has recorded a valuation allowance to reduce the deferred tax asset attributable to the net operating loss carry-forwards. At December 31, 2015 and 2014 , the Company believes it is more likely than not that the Iowa net operating loss carry-forwards will not be realized. The increase in net operating loss carry-forward in 2015 compared to 2014 reflects the additional Iowa income tax net operating loss generated during 2015 less any expiring carry-forward. A valuation allowance related to the remaining deferred tax assets has not been provided because management believes it is more likely than not that the results of future operations will generate sufficient taxable income to realize the deferred tax assets. The valuation allowance increased by $108,000 and $111,000 for the years ended December 31, 2015 and 2014 , respectively. The net change in the deferred income taxes for the years ended December 31, 2015 , 2014 and 2013 is reflected in the consolidated financial statements as follows: Year Ended December 31, 2015 2014 2013 (Amounts In Thousands) Consolidated statements of income $ 1,292 $ 71 $ (3 ) Consolidated statements of stockholders' equity 465 1,262 1,464 $ 1,757 $ 1,333 $ 1,461 Income tax expense for the years ended December 31, 2015 , 2014 and 2013 are less than the amounts computed by applying the maximum effective federal income tax rate to the income before income taxes because of the following items: 2015 2014 2013 Amount % Of Pretax Income Amount % Of Pretax Income Amount % Of Pretax Income (Amounts In Thousands) Expected tax expense $ 14,310 35.0 % $ 13,336 35.0 % $ 12,895 35.0 % Tax-exempt interest (1,776 ) (4.3 ) (1,788 ) (4.7 ) (1,690 ) (4.6 ) Interest expense limitation 97 0.2 96 0.3 99 0.3 State income taxes, net of federal income tax benefit 1,316 3.2 1,134 3.0 1,216 3.3 Income tax credits (1,426 ) (3.5 ) (1,546 ) (4.1 ) (1,992 ) (5.4 ) Other (52 ) (0.1 ) (103 ) (0.3 ) 384 1.0 $ 12,469 30.5 % $ 11,129 29.2 % $ 10,912 29.6 % Federal income tax expense for the years ended December 31, 2015 , 2014 and 2013 was computed using the consolidated effective federal tax rate. The Company also recognized income tax expense pertaining to state franchise taxes payable individually by the subsidiary bank. The Company files a consolidated tax return for federal purposes and separate tax returns for the State of Iowa purposes. The tax years ended December 31, 2015, 2014, 2013 and 2012 , remain subject to examination by the Internal Revenue Service. For state tax purposes, the tax years ended December 31, 2015, 2014, 2013 and 2012 , remain open for examination. There were no material unrecognized tax benefits at December 31, 2015 and December 31, 2014 . No interest or penalties on these unrecognized tax benefits has been recorded. As of December 31, 2015 , the Company does not anticipate any significant increase or decrease in unrecognized tax benefits during the twelve month period ending December 31, 2016.

Regulatory Capital Requirements

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions	12 Months Ended
	Dec. 31, 2015
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions [Abstract]
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions	Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions The Company and the Bank are subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial results. Under capital adequacy guidelines and the regulatory frameworks for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. Capital amounts and classifications of the Company and the Bank are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Quantitative measures established by the regulations to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the tables that follow) of total and Tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). Management believes that, as of December 31, 2015 and 2014 , the Company and the Bank met all capital adequacy requirements to which they are subject. As of December 31, 2015 , the most recent notifications from the Federal Reserve System categorized the Bank as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, the Bank must maintain minimum total risk-based, Tier 1 risk-based, Tier 1 common equity and Tier 1 leverage ratios as set forth in the table that follows. There are no conditions or events since that notification that management believes have changed the Bank's category. The actual amounts and capital ratios as of December 31, 2015 and 2014 , with the minimum regulatory requirements for the Company and Bank are presented below (amounts in thousands): Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Ratio Ratio As of December 31, 2015: Company: Total risk-based capital $ 334,899 15.82 % 8.00 % 10.00 % Tier 1 risk-based capital 308,432 14.57 6.00 8.00 Tier 1 common equity 308,432 14.57 4.50 6.50 Leverage ratio 308,432 12.53 4.00 5.00 Bank: Total risk-based capital 335,010 15.83 8.00 10.00 Tier 1 risk-based capital 308,562 14.58 6.00 8.00 Tier 1 common equity 308,562 14.58 4.50 6.50 Leverage ratio 308,562 12.54 4.00 5.00 Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Ratio Ratio As of December 31, 2014: Company: Total risk-based capital $ 310,622 17.21 % 8.00 % 10.00 % Tier 1 risk-based capital 288,047 15.96 4.00 6.00 Leverage ratio 288,047 12.54 4.00 5.00 Bank: Total risk-based capital 310,066 17.19 8.00 10.00 Tier 1 risk-based capital 287,504 15.94 5.00 6.00 Leverage ratio 287,504 12.51 4.00 5.00 The ability of the Company to pay dividends to its stockholders is dependent upon dividends paid by the Bank. The Bank is subject to certain statutory and regulatory restrictions on the amount it may pay in dividends. To maintain acceptable capital ratios in the Bank, certain of its retained earnings are not available for the payment of dividends. To maintain a ratio of capital to assets of 8.00%, retained earnings of $131.30 million as of December 31, 2015 are available for the payment of dividends to the Company. The Bank is required to maintain reserve balances in cash or with the Federal Reserve Bank. Reserve balances totaled $12.64 million and $0.54 million as of December 31, 2015 and 2014 , respectively.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Certain directors of the Company and the Bank, companies with which the directors are affiliated, and certain principal officers are customers of, and have banking transactions with, the Bank in the ordinary course of business. Such indebtedness has been incurred on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with unrelated persons. The following is an analysis of the changes in the loans to related parties during the years ended December 31, 2015 and 2014 : Year Ended December 31, 2015 2014 (Amounts In Thousands) Balance, beginning $ 19,246 $ 19,717 Net increase due to change in related parties — — Advances 24,523 11,760 Collections (16,765 ) (12,231 ) Balance, ending $ 27,004 $ 19,246 Deposits from these related parties totaled $6.92 million and $6.21 million as of December 31, 2015 and 2014 , respectively. Deposits from related parties are accepted subject to the same interest rates and terms as those from nonrelated parties.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The carrying value and estimated fair values of the Company’s financial instruments as of December 31, 2015 are as follows: December 31, 2015 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 $ 35,427 $ 35,427 $ 35,427 $ — $ — Investment securities 276,069 276,069 — 276,069 — Loans held for sale 5,554 5,554 — 5,554 — Loans Agricultural 98,506 98,530 — — 98,530 Commercial and financial 179,682 179,649 — — 179,649 Real estate: Construction, 1 to 4 family residential 50,480 50,487 — — 50,487 Construction, land development and commercial 81,707 81,705 — — 81,705 Mortgage, farmland 184,514 184,640 — — 184,640 Mortgage, 1 to 4 family first liens 720,229 718,566 — — 718,566 Mortgage, 1 to 4 family junior liens 116,632 122,173 — — 122,173 Mortgage, multi-family 270,261 272,446 — — 272,446 Mortgage, commercial 320,899 319,090 — — 319,090 Loans to individuals 23,518 23,509 — — 23,509 Obligations of state and political subdivisions 51,978 51,073 — — 51,073 Accrued interest receivable 8,672 8,672 — 8,672 — Total financial instrument assets $ 2,424,128 $ 2,427,590 $ 35,427 $ 290,295 $ 2,101,868 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 314,968 $ 314,968 $ — $ 314,968 $ — Interest-bearing deposits 1,575,734 1,577,684 — 1,577,684 — Other borrowings 44,051 44,051 — 44,051 — Federal Home Loan Bank borrowings 225,000 226,157 — 226,157 — Interest rate swaps 4,180 4,180 — 4,180 — Accrued interest payable 846 846 — 846 — Total financial instrument liabilities $ 2,164,779 $ 2,167,886 $ — $ 2,167,886 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 344,602 $ — $ — $ — $ — Letters of credit 11,718 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 356,320 $ — $ — $ — $ — (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, 2014 are as follows: December 31, 2014 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 $ 29,174 $ 29,174 $ 29,174 $ — $ — Investment securities 267,240 267,240 — 267,240 — Loans held for sale 4,476 4,476 — 4,476 — Loans Agricultural 95,130 95,126 — — 95,126 Commercial and financial 170,507 171,081 — — 171,081 Real estate: Construction, 1 to 4 family residential 45,139 45,159 — — 45,159 Construction, land development and commercial 75,589 75,623 — — 75,623 Mortgage, farmland 159,831 159,623 — — 159,623 Mortgage, 1 to 4 family first liens 666,406 665,428 — — 665,428 Mortgage, 1 to 4 family junior liens 109,133 115,726 — — 115,726 Mortgage, multi-family 243,723 246,191 — — 246,191 Mortgage, commercial 318,896 318,211 — — 318,211 Loans to individuals 21,043 21,016 — — 21,016 Obligations of state and political subdivisions 55,281 54,800 — — 54,800 Accrued interest receivable 8,276 8,276 — 8,276 — Total financial instrument assets $ 2,269,844 $ 2,277,150 $ 29,174 $ 279,992 $ 1,967,984 Financial instrument liabilities: Deposits Noninterest-bearing deposits 288,718 288,718 — 288,718 — Interest-bearing deposits 1,546,351 1,550,974 — 1,550,974 — Other borrowings 47,499 47,499 — 47,499 — Federal Home Loan Bank Borrowings 140,000 145,210 — 145,210 — Interest rate swaps 2,796 2,796 — 2,796 — Accrued interest payable 902 902 — 902 — Total financial instrument liabilities $ 2,026,266 $ 2,036,099 $ — $ 2,036,099 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 334,100 $ — $ — $ — $ — Letters of credit 12,437 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 346,537 $ — $ — $ — $ — (1) Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”). (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market Fair value of financial instruments : FASB ASC 820, Fair Value Measurements and Disclosures (“ASC 820”) provides a single definition for fair value, a framework for measuring fair value and expanded disclosures concerning fair value. Fair value is defined under ASC 820 as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company determines the fair market value of its financial instruments based on the fair value hierarchy established in ASC 820. There are three levels of inputs that may be used to measure fair value as follows: Level 1 Quoted prices in active markets for identical assets or liabilities. Level 2 Observable inputs other than quoted prices included within Level 1. Observable inputs include the quoted prices for similar assets or liabilities in markets that are not active and inputs other than quoted prices that are observable for the asset or liability. Level 3 Unobservable inputs supported by little or no market activity for financial instruments. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. It is the Company’s policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements. The Company is required to use observable inputs, to the extent available, in the fair value estimation process unless that data results from forced liquidations or distressed sales. The following is a description of valuation methodologies used for assets and liabilities recorded at fair value 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 year ended December 31, 2015 . 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 impaired loans to reflect (1) partial write-downs that are based on the observable market price or appraised value of the collateral or (2) the full charge-off of the loan carrying value (Level 3). These loans are considered Level 3 as the instruments used to determine fair market value require significant management judgment and estimation. A loan is considered to be impaired when it is probable that all of the principal and interest due may not be collected according to its contractual terms. Generally, when a loan is considered impaired, the amount of reserve required under ASC 310, Receivables, is measured based on the fair value of the underlying collateral. The Company makes such measurements on all material loans deemed impaired using the fair value of the collateral for collateral dependent loans. The fair value of collateral used by the Company is determined by obtaining an observable market price or by obtaining an appraised value from an independent, licensed or certified appraiser, using observable market data. This data includes information such as selling price of similar properties and capitalization rates of similar properties sold within the market, expected future cash flows or earnings of the subject property based on current market expectations, and other relevant factors. All appraised values are adjusted for market-related trends based on the Company's experience in sales and other appraisals of similar property types as well as estimated selling costs. Each quarter management reviews all collateral dependent impaired loans on a loan-by-loan basis to determine whether updated appraisals are necessary based on loan performance, collateral type and guarantor support. At times, the Company measures the fair value of collateral dependent impaired loans using appraisals with dates prior to one year from the date of review. These appraisals are discounted by applying current, observable market data about similar property types such as sales contracts, estimations of value by individuals familiar with the market, other appraisals, sales or collateral assessments based on current market activity until updated appraisals are obtained. Depending on the length of time since an appraisal was performed, the data provided through reviews and estimated selling costs, collateral values are typically discounted by 0-35%. Foreclosed assets : The Company does not record foreclosed assets at fair value on a recurring basis. Foreclosed assets consist mainly of other real estate owned but may include other types of assets repossessed by the Company. Foreclosed assets are adjusted to the lower of carrying value or fair value less the costs of disposal. Fair value is generally based upon independent market prices or appraised values of the collateral, and may include a marketability discount as deemed necessary by management based on its experience with similar types of real estate. The value of foreclosed assets is evaluated periodically as a nonrecurring fair value adjustment. Foreclosed assets are classified as Level 3. Off-balance sheet instruments : Fair values for outstanding letters of credit are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties' credit standing. The fair value of the outstanding letters of credit is not significant. Unfunded loan commitments are not valued since the loans are generally priced at market at the time of funding (Level 2). 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: December 31, 2015 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 $ — $ 24,978 $ — $ 24,978 State and political subdivisions — 173,929 — 173,929 Other securities (FHLB, FHLMC and FNMA) — 65,328 — 65,328 Derivative Financial Instruments Interest rate swaps — (4,180 ) — (4,180 ) Total $ — $ 260,055 $ — $ 260,055 December 31, 2014 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 $ — $ 22,333 $ — 22,333 State and political subdivisions — 168,968 — 168,968 Other securities (FHLB, FHLMC and FNMA) — 67,691 — 67,691 Derivative Financial Instruments Interest rate swaps — (2,796 ) — (2,796 ) Total $ — $ 256,196 $ — $ 256,196 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. There were no transfers between Levels 1, 2 or 3 during the years ended December 31, 2015 and 2014 . Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis The Company is required to measure certain assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from application of lower-of-cost-or-market accounting or write-downs of individual assets. The valuation methodologies used to measure these fair value adjustments are described above. For assets measured at fair value on a nonrecurring basis that were still held on the balance sheet at December 31, 2015 and 2014 , the following tables provide the level of valuation assumptions used to determine the adjustment and the carrying value of the related individual assets at year end. December 31, 2015 Year Ended December 31, 2015 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 1,470 $ 1,470 $ 116 Commercial and financial — — 1,178 1,178 56 Real Estate: Construction, 1 to 4 family residential — — 482 482 161 Construction, land development and commercial — — 132 132 35 Mortgage, farmland — — 2,233 2,233 — Mortgage, 1 to 4 family first liens — — 4,487 4,487 529 Mortgage, 1 to 4 family junior liens — — 286 286 166 Mortgage, multi-family — — 391 391 38 Mortgage, commercial — — 1,152 1,152 140 Loans to individuals — — — — — Foreclosed assets (5) — — 100 100 69 Total $ — $ — $ 11,911 $ 11,911 $ 1,310 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. (4) Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero. (5) Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets. December 31, 2014 Year Ended December 31, 2014 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 1,679 1,679 $ 25 Commercial and financial — — 1,709 $ 1,709 206 Real Estate: Construction, 1 to 4 family residential — — 315 $ 315 — Construction, land development and commercial — — — — — Mortgage, farmland — — 2,040 $ 2,040 — Mortgage, 1 to 4 family first liens — — 2,500 2,500 576 Mortgage, 1 to 4 family junior liens — — 369 $ 369 24 Mortgage, multi-family — — 5,525 5,525 — Mortgage, commercial — — 1,918 $ 1,918 328 Loans to individuals — — — — — Foreclosed assets (5) — — 301 $ 301 210 Total $ — $ — $ 16,356 $ 16,356 $ 1,369 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. (4) Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero. (5) Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.

Parent Company Only Financial I

Parent Company Only Financial Information	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Only Financial Information	Parent Company Only Financial Information Following is condensed financial information of the Company (parent company only): CONDENSED BALANCE SHEETS December 31, 2015 and 2014 (Amounts In Thousands) ASSETS 2015 2014 Cash and cash equivalents at subsidiary bank $ 843 $ 1,881 Investment in subsidiary bank 309,866 289,556 Other assets 1,553 1,527 Total assets $ 312,262 $ 292,964 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities $ 2,525 $ 2,361 Redeemable common stock held by ESOP 37,562 34,571 Stockholders' equity: Capital stock 43,697 42,925 Retained earnings 294,487 271,924 Accumulated other comprehensive (loss) income (1,195 ) (448 ) Treasury stock at cost (27,252 ) (23,798 ) 309,737 290,603 Less maximum cash obligation related to ESOP shares 37,562 34,571 Total stockholders' equity 272,175 256,032 Total liabilities and stockholders' equity $ 312,262 $ 292,964 CONDENSED STATEMENTS OF INCOME Years Ended December 31, 2015 , 2014 and 2013 (Amounts In Thousands) 2015 2014 2013 Dividends received from subsidiary $ 7,364 $ 7,438 $ 5,213 Other expenses (713 ) (637 ) (471 ) Income before income tax benefit and equity in undistributed income of subsidiary 6,651 6,801 4,742 Income tax benefit 338 254 141 6,989 7,055 4,883 Equity in undistributed income of subsidiary 21,429 19,919 21,048 Net income $ 28,418 $ 26,974 $ 25,931 CONDENSED STATEMENTS OF CASH FLOWS Years Ended December 31, 2015 , 2014 and 2013 (Amounts In Thousands) 2015 2014 2013 Cash flows from operating activities: Net income $ 28,418 $ 26,974 $ 25,931 Adjustments to reconcile net income to cash and cash equivalents provided by operating activities: Equity in undistributed income of subsidiary (21,429 ) (19,919 ) (21,048 ) Share-based compensation 29 29 28 Compensation expensed through issuance of common stock 1,153 1,045 467 Excess tax benefits related to share-based compensation (8 ) (60 ) (92 ) Forfeiture of common stock (37 ) (40 ) (35 ) Increase (decrease) in other assets (27 ) (63 ) 647 Increase in other liabilities 164 170 59 Net cash and cash equivalents provided by operating activities 8,263 8,136 5,957 Cash flows from financing activities: Stock options exercised — 101 175 Excess tax benefits related to share-based compensation 8 60 92 Purchase of treasury stock (3,454 ) (4,014 ) (1,387 ) Dividends paid (5,855 ) (5,420 ) (5,186 ) Net cash and cash equivalents used by financing activities (9,301 ) (9,273 ) (6,306 ) Decrease in cash and cash equivalents (1,038 ) (1,137 ) (349 ) Cash and cash equivalents: Beginning of year 1,881 3,018 3,367 Ending of year $ 843 $ 1,881 $ 3,018

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
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 $91.17 million . The concentrations of credit by type of loan are set forth in Note 3 to the Consolidated Financial Statements. Outstanding letters of credit were granted primarily to commercial borrowers. Although the Bank has a diversified loan portfolio, a substantial portion of its debtors' ability to honor their contracts is dependent upon the economic conditions in Johnson, Linn and Washington Counties, Iowa. Contingencies : In the normal course of business, the Company and Bank are involved in various legal proceedings. In the opinion of management, any liability resulting from such proceedings would not have a material adverse effect on the Consolidated Financial Statements. Financial instruments with off-balance sheet risk : The Bank is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, credit card participations and standby letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated balance sheets. The Bank’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit, credit card participations and standby letters of credit is represented by the contractual amount of those instruments. The Bank uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. A summary of the Bank’s commitments at December 31, 2015 and 2014 is as follows: 2015 2014 (Amounts In Thousands) Firm loan commitments and unused portion of lines of credit: Home equity loans $ 44,376 $ 40,484 Credit cards 41,518 46,573 Commercial, real estate and home construction 98,613 81,613 Commercial lines and real estate purchase loans 160,095 165,430 Outstanding letters of credit 11,718 12,437 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Bank evaluates each customer's credit worthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Bank upon extension of credit, is based on management's credit evaluation of the party. Collateral held varies, but may include accounts receivable, crops, livestock, inventory, property and equipment, residential real estate and income-producing commercial properties. Credit card commitments are the unused portion of the holders' credit limits. Such amounts represent the maximum amount of additional unsecured borrowings. Standby letters of credit are conditional commitments issued by the Bank to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements and, generally, have terms of one year or less. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. The Bank holds collateral, which may include accounts receivable, inventory, property, equipment, and income-producing properties, supporting those commitments if deemed necessary. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Bank would be required to fund the commitment. The maximum potential amount of future payments the Bank could be required to make is represented by the contractual amount shown in the summary above. If the commitment is funded the Bank would be entitled to seek recovery from the customer. At December 31, 2015 and 2014 , no amounts have been recorded as liabilities for the Bank’s potential obligations under these guarantees. Lease commitments: The Company leases certain facilities under operating leases. The minimum future rental commitments as of December 31, 2015 for all non-cancelable leases relating to Bank premises were as follows: Year ending December 31: (Amounts In Thousands) 2016 $ 448 2017 317 2018 287 2019 75 2020 1 Thereafter — $ 1,128 Rent expense was $0.35 million , $0.32 million and $0.33 million for the years ended December 31, 2015 , 2014 and 2013 , respectively.

Quarterly Results of Operations

Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts)	Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts) Quarter Ended March June September December Year 2015 Interest income $ 22,214 $ 23,027 $ 23,295 $ 23,631 $ 92,167 Interest expense 3,635 3,659 3,714 $ 3,959 14,967 Net interest income $ 18,579 $ 19,368 $ 19,581 $ 19,672 $ 77,200 Provision for loan losses (62 ) 517 (95 ) 1,295 1,655 Other income 4,990 5,506 5,218 5,088 20,802 Other expense 13,199 13,504 13,672 15,085 55,460 Income before income taxes $ 10,432 $ 10,853 $ 11,222 $ 8,380 40,887 Income taxes 3,052 3,383 3,537 2,497 12,469 Net income $ 7,380 $ 7,470 $ 7,685 $ 5,883 $ 28,418 Basic earnings per share $ 0.79 $ 0.80 $ 0.82 $ 0.63 $ 3.04 Diluted earnings per share 0.79 0.80 0.82 0.63 3.04 2014 Interest income $ 20,865 $ 21,473 $ 21,794 $ 22,450 $ 86,582 Interest expense 3,850 3,760 3,704 $ 3,723 15,037 Net interest income $ 17,015 $ 17,713 $ 18,090 $ 18,727 $ 71,545 Provision for loan losses 45 (246 ) (1,008 ) 2,251 1,042 Other income 4,421 4,947 5,247 4,741 19,356 Other expense 12,258 12,537 12,821 14,140 51,756 Income before income taxes $ 9,133 $ 10,369 $ 11,524 $ 7,077 38,103 Income taxes 2,389 3,188 3,625 1,927 11,129 Net income $ 6,744 $ 7,181 $ 7,899 $ 5,150 $ 26,974 Basic earnings per share $ 0.72 $ 0.76 $ 0.85 $ 0.55 $ 2.88 Diluted earnings per share 0.72 0.76 0.84 0.55 2.87

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments In the normal course of business, the Bank may use derivative financial instruments to manage its interest rate risk. These instruments carry varying degrees of credit, interest rate and market or liquidity risks. Derivative instruments are recognized as either assets or liabilities in the accompanying consolidated financial statements and are measured at fair value. The Bank’s objectives are to add stability to its net interest margin and to manage its exposure to movements in interest rates. The contract or notional amount of a derivative is used to determine, along with the other terms of the derivative, the amount to be exchanged between the counterparties. The Bank is exposed to credit risk in the event of nonperformance by counterparties to financial instruments. The Bank minimizes this risk by entering into derivative contracts with large, stable financial institutions. The Bank has not experienced any losses from nonperformance by counterparties. The Bank monitors counterparty risk in accordance with the provisions of ASC 815. In addition, the Bank’s interest rate-related derivative instruments contain language outlining collateral pledging requirements for each counterparty. Collateral must be posted when the market value exceeds certain threshold limits which are determined by credit ratings of each counterparty. The Bank was required to pledge $4.18 million of collateral as of December 31, 2015 . 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 has an effective date of November 7, 2016 and an expiration date of November 7, 2023 , also to effectively convert $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 edges as of December 31, 2015 and 2014 : Notional Amount Fair Value Balance Sheet Category Maturity (Amounts in Thousands) December 31, 2015 Interest rate swap $ 25,000 $ (1,501 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,679 ) Other Liabilities 11/7/2023 December 31, 2014 Interest rate swap 25,000 $ (864 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (1,932 ) Other Liabilities 11/7/2023 The table below identifies the gains and losses recognized on the Bank’s derivative instruments designated as cash flow hedges for the year ended December 31, 2015 and 2014 : Effective Portion Ineffective Portion Recognized in OCI Reclassified from AOCI into Income Recognized in Income on Derivatives Amount of Gain (Loss) Category Amount of Gain (Loss) Category Amount of Gain (Loss) (Amounts in Thousands) December 31, 2015 Interest rate swap $ (394 ) Interest Expense $ — Other Income $ — Interest rate swap (461 ) Interest Expense — Other Income — December 31, 2014 Interest rate swap (754 ) Interest Expense — Other Income — Interest rate swap (1,448 ) Interest Expense — Other Income —

Nature of Activities and Sign26

Nature of Activities and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of activities	Nature of activities : Hills Bancorporation (the "Company") is a holding company engaged in the business of commercial banking. The Company's subsidiary is Hills Bank and Trust Company, Hills, Iowa (the “Bank”), which is wholly-owned. The Bank is a full-service commercial bank extending its services to individuals, businesses, governmental units and institutional customers primarily in the communities of Hills, Iowa City, Coralville, North Liberty, Lisbon, Mount Vernon, Kalona, Wellman, Cedar Rapids, Marion and Washington, Iowa. The Bank competes with other financial institutions and non-financial institutions providing similar financial products. Although the loan activity of the Bank is diversified with commercial and agricultural loans, real estate loans, automobile, installment and other consumer loans, the Bank's credit is concentrated in real estate loans. All of the Company’s operations are considered to be one reportable operating segment.
Accounting estimates	Accounting estimates : The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Certain significant estimates	Certain significant estimates : The allowance for loan losses, fair values of securities and other financial instruments, and share-based compensation expense involve certain significant estimates made by management. These estimates are reviewed by management routinely and it is reasonably possible that circumstances that exist at December 31, 2015 may change in the near-term and the effect could be material to the consolidated financial statements.
Principles of consolidation	Principles of consolidation : The consolidated financial statements include the accounts of the Company and its subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation.
Revenue recognition	Revenue recognition : Interest income on loans and investment securities is recognized on the accrual method. Loan origination fees of mortgage loans originated for sale are recognized when the loans are sold. Trust fees, deposit account service charges and other fees are recognized when the services are provided or when customers use the services.
Cash and cash equivalents	Cash and cash equivalents : The Company considers all investments with original maturities of three months or less to be cash equivalents. At December 31, 2015 and 2014 , cash equivalents consisted primarily of deposits with other banks.
Investment securities	Investment securities : Available-for-sale securities consist of debt securities not classified as trading or held to maturity. Available-for-sale securities are stated at fair value, and unrealized holding gains and losses, net of the related deferred tax effect, are reported as a separate component of stockholders' equity. There were no trading or held to maturity securities as of December 31, 2015 or 2014 . Stock of the Federal Home Loan Bank is carried at cost. The Company has evaluated the stock and determined there is no impairment. Premiums and discounts on debt securities are amortized or accreted over the period to maturity of those securities. The method of amortization results in a constant effective yield on those securities (the interest method). Realized gains and losses on investment securities are included in income, determined on the basis of the cost of the specific securities sold. Declines in the fair value of investment securities available for sale (with certain exceptions for debt securities noted below) that are deemed to be other-than-temporary are charged to earnings as a realized loss, and a new cost basis for the securities is established. In evaluating other-than-temporary impairment, the Company considers the length of time and extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value in the near term. Declines in the fair value of debt securities below amortized cost are deemed to be other-than-temporary in circumstances where: (1) the Company has the intent to sell a security; (2) it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis; or (3) the Company does not expect to recover the entire amortized cost basis of the security. If the Company intends to sell a security or if it is more likely than not that the Company will be required to sell the security before recovery, an other-than-temporary impairment write-down is recognized in earnings equal to the difference between the security’s amortized cost basis and its fair value. If the Company does not intend to sell the security or it is not more likely than not that the Company will be required to sell the security before recovery, the other-than-temporary impairment write-down is separated into an amount representing credit loss, which is recognized in earnings, and an amount related to all other factors, which is recognized in other comprehensive income. Realized securities gains or losses on securities sales (using specific identification method) and declines in value judged to be other-than-temporary are included in investment securities gains (losses), net, in the consolidated statements of income.
Loans	Loans : Loans are stated at the amount of unpaid principal, reduced by the allowance for loan losses. Interest income is accrued on the unpaid balances as earned. Loans held for sale are stated at the lower of aggregate cost or estimated fair value. Loans are sold on a non-recourse basis with servicing released and gains and losses are recognized based on the difference between sales proceeds and the carrying value of the loan. The Company has had very few experiences of repurchasing loans previously sold into the secondary market. A specific reserve was not considered necessary based on the Company’s historical experience with repurchase activity. The allowance for loan losses is established through a provision for loan losses charged to expense. Loans are charged against the allowance when management believes the collectability of principal is unlikely. The allowance for loan losses is maintained at a level considered adequate to provide for probable losses that can be reasonably anticipated. The allowance is increased by provisions charged to expense and is reduced by net charge-offs. The Bank makes continuous reviews of the loan portfolio and considers current economic conditions, historical loss experience, review of specific problem loans and other factors in determining the adequacy of the allowance. Management classifies loans within the following categories: excellent, good, satisfactory, monitor, special mention and substandard. The policy for charging off loans is consistent throughout all loan categories. A loan is charged off based on criteria that includes but is not limited to: delinquency status, financial condition of the entire customer credit line and underlying collateral coverage, economic or external conditions that might impact full repayment of the loan, legal issues, overdrafts, and the customer’s willingness to work with the Company. Loans are considered impaired when, based on current information and events, it is probable the Bank will not be able to collect all amounts due. An impaired loan includes any loan that has been placed on nonaccrual status, loans greater than 90 days past due and still accruing and TDR loans. They also include loans, based on current information and events, that it is likely the Bank will be unable to collect all amounts due according to the contractual terms of the original loan agreement. The portion of the allowance for loan losses applicable to impaired loans has been computed based on the present value of the estimated future cash flows of interest and principal discounted at the loans effective interest rate or on the fair value of the collateral for collateral dependent loans. The entire change in present value of expected cash flows of impaired loans or of collateral value is reported as provision expense in the same manner in which impairment initially was recognized or as a reduction in the amount of provision expense that otherwise would be reported. Interest income on nonaccrual loans is recognized once principal has been recovered. The accrual of interest income on loans is discontinued when, in the opinion of management, there is reasonable doubt as to the borrower's ability to meet payments of interest or principal when they become due, which is generally when a loan is 90 days or more past due. When a loan is placed on nonaccrual status, all previously accrued and unpaid interest is reversed. Loans are returned to an accrual status when all of the principal and interest amounts contractually due are brought current and repayment of the remaining contractual principal and interest is expected. A loan may also return to accrual status if additional collateral is received from the borrower and, in the opinion of management, the financial position of the borrower indicates that there is no longer any reasonable doubt as to the collection of the amount contractually due. Payment received on nonaccrual loans are applied first to principal. Once principal is recovered, any remaining payments received are applied to interest income. As of December 31, 2015 , none of the Company’s nonaccrual loans were earning interest on a cash basis. Nonrefundable loan fees and origination costs are deferred and recognized as a yield adjustment over the life of the related loan.
Troubled debt restructurings (TDR loans)	Troubled debt restructurings (“TDR loans”) : A loan is classified as a troubled debt restructuring when a borrower is experiencing financial difficulties that leads to a restructuring of the loan, and the Company grants concessions to the borrower in the restructuring that it would not otherwise consider. These concessions may include rate reductions, principal forgiveness, extension of maturity date and other actions intended to minimize potential losses to the Company. A loan that is modified at a market rate of interest is no longer classified as troubled debt restructuring in the quarter following the modification if the borrower is no longer experiencing financial difficulties. Performance prior to the restructuring is considered when assessing whether the borrower can meet the new terms. At the time of restructuring, loans included in a troubled debt restructuring may be considered nonaccrual loans. TDR loans are returned to accrual status under the same criteria noted under loans above.
Transfers of financial assets	Transfers of financial assets : Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Company, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets and (3) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
Credit related financial instruments	Credit related financial instruments : In the ordinary course of business, the Company has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit and standby letters of credit. Such financial instruments are recorded when they are funded.
Tax credit real estate	Tax credit real estate : Tax credit real estate represents two multi-family rental properties, three assisted living rental properties, a multi-tenant rental property for persons with disabilities, and a multi-family senior living rental property, all which are affordable housing projects as of December 31, 2015 . The Bank has a 99% or greater limited partnership interest in each limited partnership. The investment in each was completed after the projects had been developed by the general partner. The properties are recorded at cost less accumulated depreciation. The Company evaluates the recoverability of the carrying value on a regular basis. If the recoverability was determined to be in doubt, a valuation allowance would be established by way of a charge to expense. Depreciation expense is provided on a straight-line basis over the estimated useful life of the assets. Expenditures for normal repairs and maintenance are charged to expense as incurred. The financial condition, results of operations and cash flows of each limited partnership is consolidated in the Company’s Consolidated Financial Statements. The operations of the properties are not expected to contribute significantly to the Company’s income before income taxes. However, the properties do contribute in the form of income tax credits, which lowers the Company’s effective tax rate. Once established, the credits on each property last for ten years and are passed through from the limited partnerships to the Bank and reduces the consolidated federal tax liability of the Company.
Property and equipment	Property and equipment : Property and equipment is stated at cost less accumulated depreciation. Depreciation is computed using primarily declining-balance methods over the estimated useful lives of 7-40 years for buildings and improvements and 3-10 years for furniture and equipment.
Deferred income taxes	Deferred income taxes : Deferred income taxes are provided under the asset and liability method whereby deferred tax assets are recognized for deductible temporary differences and net operating loss, and tax credit carryforwards and deferred tax liabilities are recognized for taxable temporary differences. Temporary differences are the differences between the reported amounts of assets and liabilities and their tax bases. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some or all of the deferred tax assets will not be realized. Deferred tax assets and liabilities are adjusted for the effects of changes in tax laws and rates on the date of enactment. The Company recognizes the effect of income tax positions only if those positions are more likely than not of being sustained. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. Interest and penalties on unrecognized tax benefits are classified as other noninterest expense. As of December 31, 2015 , the Company had no material unrecognized tax benefits.
Goodwill	Goodwill : Goodwill represents the excess of cost over the fair value of the net assets acquired, and is not subject to amortization, but requires, at a minimum, annual impairment tests for intangibles that are determined to have an indefinite life.
Other real estate	Other real estate : Other real estate represents property acquired through foreclosures and settlements of loans. Property acquired is carried at the lower of the principal amount of the loan outstanding at the time of acquisition, plus any acquisition costs, or the estimated fair value of the property, less disposal costs. The Bank will obtain updated appraisals to determine the estimated fair value of the property based on the type of collateral securing the loan and the date of the latest appraisal. Subsequent write downs estimated on the basis of later valuations are charged to net loss on sale of other real estate owned and other repossessed assets. Net operating expenses incurred in maintaining such properties are charged to other non-interest expense.
Derivative financial instruments	Derivative financial instruments : The Bank uses interest rate swaps as part of its interest rate risk management. Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 815 establishes accounting and reporting standards for derivative instruments and hedging activities. The Bank records all interest rate swaps on the balance sheet at fair value. Derivatives used to hedge the exposure to variability in expected future cash flows are considered cash flow hedges. To qualify for hedge accounting, the Bank must comply with the detailed rules and documentation requirements at the inception of the hedge, and hedge effectiveness is assessed at inception and periodically throughout the life of the hedging relationship. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivatives is initially reported in other comprehensive income and subsequently reclassified to interest income or expense when the hedged transaction affects earnings, while the ineffective portion of changes in fair value of the derivative, if any, is recognized immediately in other noninterest income or expense. The Bank assesses the effectiveness of each hedging relationship by comparing the cumulative changes in cash flows of the derivative hedging instruments with the cumulative changes in cash flows of the designated hedged item or transaction. No component of the change in the fair value of the hedging instrument is excluded from the assessment of hedge effectiveness. The Bank does not use derivatives for trading or speculative purposes.
Earnings per share	Earnings per share: Basic earnings per share is computed using the weighted average number of actual common shares outstanding during the period. Diluted earnings per share reflects the potential dilution that would occur from the exercise of common stock options outstanding. ESOP shares are considered outstanding for this calculation unless unearned.
Stock awards and options	Stock awards and options : Compensation expense for stock issued through the stock award plan is accounted for using the fair value method prescribed by FASB ASC 718, “Share-Based Payment” (“ASC 718”). Under this method, compensation expense is measured and recognized for all stock-based awards made to employees and directors based on the fair value of each option as of the date of the grant.
Common stock held by ESOP	Common stock held by ESOP : The Company's maximum cash obligation related to these shares is classified outside stockholders' equity because the shares are not readily traded and could be put to the Company for cash.
Treasury Stock	Treasury Stock : Treasury stock is accounted for by the cost method, whereby shares of common stock reacquired are recorded at their purchase price.
Trust Department Assets	Trust Department Assets : Property held for customers in fiduciary or agency capacities is not included in the accompanying consolidated balance sheets, as such items are not assets of the Company.
Effect of New Financial Accounting Standards	Effect of New Financial Accounting Standards : In May 2014, The FASB and International Accounting Standards Board (IASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). The core principle of ASU 2014-09 is that a company should recognize revenue to depict the transfer of promised 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 currently reviewing the provisions of this standard to determine the application to financial institutions. In February 2015, the FASB issued ASU No. 2015-02 (Topic 810), Consolidation . The ASU modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIE) or voting interest entities (VOE). The standard relaxes existing criteria for determining when fees paid to a decision maker or service provider do not represent a variable interest by focusing on whether those fees are "at market". The ASU eliminates both the consolidation model specific to limited partnerships and the current presumption that a general partner controls a limited partnership. For public companies, ASU 2015-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The Company is currently reviewing the provisions of this standard to determine the impact on the Company's financial statements. In April 2015, the FASB issued ASU No. 2015-03, Interest - Imputation of Interest (Subtopic 835-30), Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. For public companies, ASU 2015-03 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The Company has determined that the adoption of ASU 2015-03 will not have a material impact on the Company's financial statements. In April 2015, the FASB issued ASU No. 2015-05, Intangibles – Goodwill and Other Internal-Use Software (Subtopic 350-40), Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. ASU 2015-05 provides guidance to customers about whether a cloud computing arrangement includes a software license. If it does, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. The adoption of ASU 2015-05 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.

Nature of Activities and Sign27

Nature of Activities and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Calculations of earnings per share	The following table presents calculations of earnings per share: Year Ended December 31, 2015 2014 2013 (Amounts In Thousands, except share and per share data) Computation of weighted average number of basic and diluted shares: Common shares outstanding at the beginning of the year 9,380,432 9,455,250 9,424,656 Weighted average number of net shares redeemed (36,296 ) (67,022 ) (4,220 ) Weighted average shares outstanding (basic) 9,344,136 9,388,228 9,420,436 Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method 5,391 4,700 7,270 Weighted average number of shares (diluted) 9,349,527 9,392,928 9,427,706 Net income $ 28,418 $ 26,974 $ 25,931 Earnings per share: Basic $ 3.04 $ 2.88 $ 2.76 Diluted $ 3.04 $ 2.87 $ 2.75

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Carrying values of investment securities	The carrying values of investment securities at December 31, 2015 and December 31, 2014 are summarized in the following table (Amounts in Thousands): December 31, 2015 December 31, 2014 Amount Percent Amount Percent Securities available for sale U.S. Treasury $ 24,978 9.45 % $ 22,333 8.62 % Other securities (FHLB, FHLMC and FNMA) 65,328 24.72 % 67,691 26.14 % State and political subdivisions 173,929 65.83 % 168,968 65.24 % Total securities available for sale $ 264,235 100.00 % $ 258,992 100.00 %
Carrying amount of available-for-sale securities and approximate fair values	The carrying amount of available-for-sale securities and their approximate fair values were as follows (Amounts in Thousands): Amortized Cost Gross Unrealized Gains Gross Unrealized (Losses) Estimated Fair Value December 31, 2015: U.S. Treasury $ 24,893 $ 92 $ (7 ) $ 24,978 Other securities (FHLB, FHLMC and FNMA) 65,400 81 (153 ) 65,328 State and political subdivisions 171,698 2,375 (144 ) 173,929 Total $ 261,991 $ 2,548 $ (304 ) $ 264,235 December 31, 2014: U.S. Treasury $ 22,351 $ 18 $ (36 ) $ 22,333 Other securities (FHLB, FHLMC and FNMA) 67,644 147 (100 ) 67,691 State and political subdivisions 166,925 2,499 (456 ) 168,968 Total $ 256,920 $ 2,664 $ (592 ) $ 258,992
Available-for-sale securities classified as per contractual maturities	The amortized cost and estimated fair value of available-for-sale securities classified according to their contractual maturities at December 31, 2015 , were as follows (Amounts in Thousands): Amortized Cost Fair Value Due in one year or less $ 42,538 $ 42,577 Due after one year through five years 146,953 148,176 Due after five years through ten years 70,672 71,653 Due over ten years 1,828 1,829 Total $ 261,991 $ 264,235
Sales proceeds and gross realized gains and losses on available-for-sale securities	Sales proceeds and gross realized gains and losses on available-for-sale securities were as follows (Amounts in Thousands): 2015 2014 2013 Sales proceeds $ — $ — $ 566 Gross realized gains — — 17 Gross realized losses — — —
Available-for-sale securities, continuous unrealized loss position, fair value	The following table shows the Company’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2015 and 2014 (Amounts in Thousands): Less than 12 months 12 months or more Total 2015 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 3 $ 7,455 $ (7 ) 0.09 % — $ — $ — — % 3 $ 7,455 $ (7 ) 0.09 % Other securities (FHLB, FHLMC and FNMA) 15 36,830 (153 ) 0.42 % — — — — % 15 36,830 (153 ) 0.42 % State and political subdivisions 56 13,557 (70 ) 0.52 % 27 5,633 (74 ) 1.31 % 83 19,190 (144 ) 0.75 % Total temporarily impaired securities 74 $ 57,842 $ (230 ) 0.40 % 27 $ 5,633 $ (74 ) 1.31 % 101 $ 63,475 $ (304 ) 0.48 % Less than 12 months 12 months or more Total 2014 Description # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % # Fair Value Unrealized Loss % of Securities U.S. Treasury 5 $ 12,396 $ (36 ) 0.29 % — $ — $ — — % 5 $ 12,396 $ (36 ) 0.29 % Other securities (FHLB, FHLMC and FNMA) 10 24,382 (100 ) 0.41 — — — — 10 24,382 (100 ) 0.41 % State and political subdivisions 91 21,724 (124 ) 0.57 78 16,154 (332 ) 2.06 169 37,878 (456 ) 1.20 % Total temporarily impaired securities 106 $ 58,502 $ (260 ) 0.44 % 78 $ 16,154 $ (332 ) 2.06 % 184 $ 74,656 $ (592 ) 0.79 %

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Schedule of classes of loans	Classes of loans are as follows: December 31, 2015 2014 (Amounts In Thousands) Agricultural $ 101,588 $ 97,645 Commercial and financial 184,199 174,738 Real estate: Construction, 1 to 4 family residential 51,346 45,949 Construction, land development and commercial 83,121 77,020 Mortgage, farmland 187,856 162,503 Mortgage, 1 to 4 family first liens 727,160 672,674 Mortgage, 1 to 4 family junior liens 117,873 110,284 Mortgage, multi-family 271,974 245,213 Mortgage, commercial 323,409 321,601 Loans to individuals 24,019 21,342 Obligations of state and political subdivisions 52,371 55,729 2,124,916 1,984,698 Net unamortized fees and costs 768 691 2,125,684 1,985,389 Less allowance for loan losses 26,510 24,020 $ 2,099,174 $ 1,961,369
Schedule of changes in allowance for loan losses	Changes in the allowance for loan losses and the allowance for loan loss balance applicable to impaired loans and the related loan balance of impaired loans for the year ended December 31, 2015 , 2014 and 2013 are as follows: Agricultural Commercial and Financial Real Estate: Construction and land development Real Estate: Mortgage, farmland Real Estate: Mortgage, 1 to 4 family Real Estate: Mortgage, multi-family and commercial Other Total (Amounts In Thousands) 2015 Allowance for loan losses: Beginning balance $ 2,515 $ 4,231 $ 2,241 $ 2,672 $ 7,419 $ 4,195 $ 747 $ 24,020 Charge-offs (325 ) (526 ) (285 ) — (1,108 ) (723 ) (438 ) (3,405 ) Recoveries 123 1,370 501 6 762 1,310 168 4,240 Provision 769 (558 ) (177 ) 664 1,099 (559 ) 417 1,655 Ending balance $ 3,082 $ 4,517 $ 2,280 $ 3,342 $ 8,172 $ 4,223 $ 894 $ 26,510 Ending balance, individually evaluated for impairment $ 1 $ 324 $ 22 $ — $ 326 $ 110 $ 100 $ 883 Ending balance, collectively evaluated for impairment $ 3,081 $ 4,193 $ 2,258 $ 3,342 $ 7,846 $ 4,113 $ 794 $ 25,627 Loan balances: Ending balance $ 101,588 $ 184,199 $ 134,467 $ 187,856 $ 845,033 $ 595,383 $ 76,390 $ 2,124,916 Ending balance, individually evaluated for impairment $ 1,710 $ 2,110 $ 954 $ 2,233 $ 5,926 $ 3,228 $ 100 $ 16,261 Ending balance, collectively evaluated for impairment $ 99,878 $ 182,089 $ 133,513 $ 185,623 $ 839,107 $ 592,155 $ 76,290 $ 2,108,655 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) 2014 Allowance for loan losses: Beginning balance $ 2,852 $ 4,733 $ 2,918 $ 2,557 $ 7,064 $ 4,787 $ 639 $ 25,550 Charge-offs (174 ) (3,388 ) (250 ) — (1,195 ) (217 ) (325 ) (5,549 ) Recoveries 66 1,128 390 — 870 377 146 2,977 Provision (229 ) 1,758 (817 ) 115 680 (752 ) 287 1,042 Ending balance $ 2,515 $ 4,231 $ 2,241 $ 2,672 $ 7,419 $ 4,195 $ 747 $ 24,020 Ending balance, individually evaluated for impairment $ 44 $ 9 $ 28 $ 12 $ 52 $ 9 $ — $ 154 Ending balance, collectively evaluated for impairment $ 2,471 $ 4,222 $ 2,213 $ 2,660 $ 7,367 $ 4,186 $ 747 $ 23,866 Loan balances: Ending balance $ 97,645 $ 174,738 $ 122,969 $ 162,503 $ 782,958 $ 566,814 $ 77,071 $ 1,984,698 Ending balance, individually evaluated for impairment $ 1,844 $ 2,709 $ 560 $ 2,318 $ 3,826 $ 9,512 $ — $ 20,769 Ending balance, collectively evaluated for impairment $ 95,801 $ 172,029 $ 122,409 $ 160,185 $ 779,132 $ 557,302 $ 77,071 $ 1,963,929 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) 2013 Allowance for loan losses: Beginning balance $ 1,653 $ 4,573 $ 3,175 $ 1,746 $ 8,088 $ 5,104 $ 821 $ 25,160 Charge-offs — (1,692 ) (245 ) — (887 ) (356 ) (166 ) (3,346 ) Recoveries 35 1,002 323 — 618 464 163 2,605 Provision 1,164 850 (335 ) 811 (755 ) (425 ) (179 ) 1,131 Ending balance $ 2,852 $ 4,733 $ 2,918 $ 2,557 $ 7,064 $ 4,787 $ 639 $ 25,550 Ending balance, individually evaluated for impairment $ 3 $ 16 $ — $ 14 $ 66 $ 205 $ — $ 304 Ending balance, collectively evaluated for impairment $ 2,849 $ 4,717 $ 2,918 $ 2,543 $ 6,998 $ 4,582 $ 639 $ 25,246 Loan balances: Ending balance $ 82,138 $ 166,102 $ 99,491 $ 142,685 $ 711,472 $ 559,277 $ 64,991 $ 1,826,156 Ending balance, individually evaluated for impairment $ 120 $ 2,407 $ 1,410 $ 284 $ 4,542 $ 17,763 $ — $ 26,526 Ending balance, collectively evaluated for impairment $ 82,018 $ 163,695 $ 98,081 $ 142,401 $ 706,930 $ 541,514 $ 64,991 $ 1,799,630
Schedule of credit quality indicators by type of loans	The following table presents the credit quality indicators by type of loans in each category as of December 31, 2015 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2015 Grade: Excellent $ 1,786 $ 3,298 $ — $ 260 Good 15,959 38,764 1,898 11,570 Satisfactory 36,819 102,188 34,357 52,731 Monitor 18,064 27,181 8,684 11,550 Special Mention 25,356 8,231 5,842 6,542 Substandard 3,604 4,537 565 468 Total $ 101,588 $ 184,199 $ 51,346 $ 83,121 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 2015 Grade: Excellent $ 2,559 $ 426 $ — $ 6,651 Good 31,186 15,773 2,992 64,002 Satisfactory 112,038 620,731 107,091 166,193 Monitor 27,304 55,499 4,198 29,732 Special Mention 11,181 16,237 1,846 4,873 Substandard 3,588 18,494 1,746 523 Total $ 187,856 $ 727,160 $ 117,873 $ 271,974 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2015 Grade: Excellent $ 12,484 $ — $ 2,365 $ 29,829 Good 81,305 70 37,045 300,564 Satisfactory 187,728 23,197 12,425 1,455,498 Monitor 32,141 285 518 215,156 Special Mention 6,183 198 — 86,489 Substandard 3,568 269 18 37,380 Total $ 323,409 $ 24,019 $ 52,371 $ 2,124,916 The following table presents the credit quality indicators by type of loans in each category as of December 31, 2014 : Agricultural Commercial and Financial Real Estate: Construction, 1 to 4 family residential Real Estate: Construction, land development and commercial (Amounts In Thousands) 2014 Grade: Excellent $ 1,375 $ 4,820 $ — $ 276 Good 13,214 37,941 6,893 13,875 Satisfactory 51,107 94,158 27,738 47,852 Monitor 15,243 20,445 8,435 2,811 Special Mention 13,070 11,031 1,881 11,870 Substandard 3,636 6,343 1,002 336 Total $ 97,645 $ 174,738 $ 45,949 $ 77,020 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 2014 Grade: Excellent $ 2,867 $ 474 $ — $ 7,011 Good 36,680 22,094 2,875 73,852 Satisfactory 103,552 571,546 99,095 111,650 Monitor 11,754 41,805 3,377 35,812 Special Mention 4,721 18,428 2,520 16,611 Substandard 2,929 18,327 2,417 277 Total $ 162,503 $ 672,674 $ 110,284 $ 245,213 Real Estate: Mortgage, commercial Loans to individuals Obligations of state and political subdivisions Total 2014 Grade: Excellent $ 15,416 $ 87 $ 2,440 $ 34,766 Good 87,612 94 43,108 338,238 Satisfactory 178,069 20,465 10,181 1,315,413 Monitor 25,165 251 — 165,098 Special Mention 9,371 353 — 89,856 Substandard 5,968 92 — 41,327 Total $ 321,601 $ 21,342 $ 55,729 $ 1,984,698
Schedule of past due loans	Past due loans as of December 31, 2015 and 2014 were as follows: 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Accruing Loans Past Due 90 Days or More (Amounts In Thousands) December 31, 2015 Agricultural $ 3,064 $ 961 $ — $ 4,025 $ 97,563 $ 101,588 $ — Commercial and financial 854 71 1,312 2,237 181,962 184,199 — Real estate: Construction, 1 to 4 family residential — — 214 214 51,132 51,346 — Construction, land development and commercial — — 88 88 83,033 83,121 — Mortgage, farmland 320 88 — 408 187,448 187,856 — Mortgage, 1 to 4 family first liens 4,526 1,192 2,085 7,803 719,357 727,160 406 Mortgage, 1 to 4 family junior liens 250 13 110 373 117,500 117,873 — Mortgage, multi-family 135 — 113 248 271,726 271,974 — Mortgage, commercial 1,033 — 331 1,364 322,045 323,409 61 Loans to individuals 158 40 — 198 23,821 24,019 — Obligations of state and political subdivisions — — — — 52,371 52,371 — $ 10,340 $ 2,365 $ 4,253 $ 16,958 $ 2,107,958 $ 2,124,916 $ 467 30 - 59 Days Past Due 60 - 89 Days Past Due 90 Days or More Past Due Total Past Due Current Total Loans Receivable Accruing Loans Past Due 90 Days or More (Amounts In Thousands) December 31, 2014 Agricultural $ 310 $ 99 $ — $ 409 $ 97,236 $ 97,645 $ — Commercial and financial 397 14 1,048 1,459 173,279 174,738 — Real estate: Construction, 1 to 4 family residential — — — — 45,949 45,949 — Construction, land development and commercial 937 — — 937 76,083 77,020 — Mortgage, farmland 753 — — 753 161,750 162,503 — Mortgage, 1 to 4 family first liens 3,594 1,656 1,582 6,832 665,842 672,674 348 Mortgage, 1 to 4 family junior liens 181 12 244 437 109,847 110,284 — Mortgage, multi-family — 21 — 21 245,192 245,213 — Mortgage, commercial 359 557 34 950 320,651 321,601 — Loans to individuals 27 — — 27 21,315 21,342 — Obligations of state and political subdivisions — — — — 55,729 55,729 — $ 6,558 $ 2,359 $ 2,908 $ 11,825 $ 1,972,873 $ 1,984,698 $ 348
Schedule of impaired loan information	Certain impaired loan information by loan type at December 31, 2015 and 2014 was as follows: December 31, 2015 December 31, 2014 Nonaccrual loans (1) Accruing loans past due 90 days or more TDR loans Nonaccrual loans (1) Accruing loans past due 90 days or more TDR loans (Amounts In Thousands) (Amounts In Thousands) Agricultural $ — $ — $ 1,710 $ — $ — $ 1,942 Commercial and financial 1,498 — 612 1,343 — 1,366 Real estate: Construction, 1 to 4 family residential 214 — 473 — — 431 Construction, land development and commercial 145 — 122 127 — — Mortgage, farmland — — 2,233 — — 2,220 Mortgage, 1 to 4 family first liens 3,845 406 1,369 1,912 348 1,199 Mortgage, 1 to 4 family junior liens 279 — 27 369 — — Mortgage, multi-family 449 — — 55 — 5,470 Mortgage, commercial 985 61 1,733 2,275 — 1,712 Loans to individuals — — — — — — $ 7,415 $ 467 $ 8,279 $ 6,081 $ 348 $ 14,340 (1) There were $2.31 million and $2.14 million of TDR loans included within nonaccrual loans as of December 31, 2015 and 2014 , respectively.
Schedule of information for TDR loans	Below is a summary of information for TDR loans as of December 31, 2015 and 2014 : December 31, 2015 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 7 $ 1,710 $ 32 Commercial and financial 8 1,818 241 Real estate: Construction, 1 to 4 family residential 3 646 138 Construction, land development and commercial 1 122 — Mortgage, farmland 5 2,233 — Mortgage, 1 to 4 family first liens 13 1,575 — Mortgage, 1 to 4 family junior liens 2 36 — Mortgage, multi-family 1 71 — Mortgage, commercial 10 2,381 — Loans to individuals — — — 50 $ 10,592 $ 411 December 31, 2014 Number of contracts Recorded investment Commitments outstanding (Dollar Amounts In Thousands) Agricultural 9 $ 1,942 $ 272 Commercial and financial 13 2,202 53 Real estate: Construction, 1 to 4 family residential 3 431 111 Construction, land development and commercial 1 127 — Mortgage, farmland 4 2,220 — Mortgage, 1 to 4 family first liens 11 1,467 — Mortgage, 1 to 4 family junior liens 1 225 65 Mortgage, multi-family 2 5,470 — Mortgage, commercial 8 2,398 — Loans to individuals — — — 52 $ 16,482 $ 501 A summary of TDR loans that were modified during the year ended December 31, 2015 and 2014 was as follows: December 31, 2015 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 3 $ 279 $ 163 Commercial and financial 2 676 663 Real estate: Construction, 1 to 4 family residential 1 277 277 Construction, land development and commercial — — — Mortgage, farmland 2 513 399 Mortgage, 1 to 4 family first liens 4 353 353 Mortgage, 1 to 4 family junior liens 2 41 41 Mortgage, multi-family 1 71 71 Mortgage, commercial 2 144 144 Loans to individuals — — — 17 $ 2,354 $ 2,111 December 31, 2014 Number of Contracts Pre-modification recorded investment Post-modification recorded investment ( Dollar Amounts In Thousands) Agricultural 8 $ 2,033 $ 2,033 Commercial and financial 5 803 803 Real estate: Construction, 1 to 4 family residential 3 443 431 Construction, land development and commercial 1 132 132 Mortgage, farmland 3 2,007 2,007 Mortgage, 1 to 4 family first liens 3 433 433 Mortgage, 1 to 4 family junior liens 1 225 225 Mortgage, multi-family — — — Mortgage, commercial 1 319 319 Loans to individuals — — — 25 $ 6,395 $ 6,383
Schedule of impaired loans	Information regarding impaired loans as of and for the year ended December 31, 2015 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2015 With no related allowance recorded: Agricultural $ 1,609 $ 1,773 $ — $ 1,620 $ 80 Commercial and financial 1,263 1,981 — 1,421 5 Real estate: Construction, 1 to 4 family residential 238 238 — 173 5 Construction, land development and commercial 210 314 — 231 6 Mortgage, farmland 2,233 2,351 — 2,305 110 Mortgage, 1 to 4 family first liens 3,558 4,419 — 3,806 48 Mortgage, 1 to 4 family junior liens 189 500 — 204 — Mortgage, multi-family 157 226 — 175 — Mortgage, commercial 1,831 3,018 — 1,839 50 Loans to individuals — 20 — — — $ 11,288 $ 14,840 $ — $ 11,774 $ 304 With an allowance recorded: Agricultural $ 101 $ 101 $ 1 $ 106 $ 5 Commercial and financial 847 847 324 990 30 Real estate: Construction, 1 to 4 family residential 449 461 9 449 12 Construction, land development and commercial 57 58 13 58 — Mortgage, farmland — — — — — Mortgage, 1 to 4 family first liens 2,062 2,156 306 2,133 36 Mortgage, 1 to 4 family junior liens 117 270 20 179 1 Mortgage, multi-family 292 332 58 316 — Mortgage, commercial 948 1,030 52 974 38 Loans to individuals 100 100 100 67 4 $ 4,973 $ 5,355 $ 883 $ 5,272 $ 126 Total: Agricultural $ 1,710 $ 1,874 $ 1 $ 1,726 $ 85 Commercial and financial 2,110 2,828 324 2,411 35 Real estate: Construction, 1 to 4 family residential 687 699 9 622 17 Construction, land development and commercial 267 372 13 289 6 Mortgage, farmland 2,233 2,351 — 2,305 110 Mortgage, 1 to 4 family first liens 5,620 6,575 306 5,939 84 Mortgage, 1 to 4 family junior liens 306 770 20 383 1 Mortgage, multi-family 449 558 58 491 — Mortgage, commercial 2,779 4,048 52 2,813 88 Loans to individuals 100 120 100 67 4 $ 16,261 $ 20,195 $ 883 $ 17,046 $ 430 Information regarding impaired loans as of and for the year ended December 31, 2014 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2014 With no related allowance recorded: Agricultural $ 1,634 $ 1,696 $ — $ 1,496 $ 71 Commercial and financial 2,076 3,695 — 1,930 29 Real estate: Construction, 1 to 4 family residential 89 89 — 44 1 Construction, land development and commercial 128 220 — 142 — Mortgage, farmland 2,040 2,040 — 1,897 90 Mortgage, 1 to 4 family first liens 2,951 3,705 — 2,980 47 Mortgage, 1 to 4 family junior liens 369 673 — 386 — Mortgage, multi-family 5,525 5,632 — 5,598 249 Mortgage, commercial 3,290 4,588 — 3,534 53 Loans to individuals — 20 — — — $ 18,102 $ 22,358 $ — $ 18,007 $ 540 With an allowance recorded: Agricultural $ 210 $ 247 $ 44 $ 220 $ 11 Commercial and financial 633 633 9 694 36 Real estate: Construction, 1 to 4 family residential 343 354 28 348 19 Construction, land development and commercial — — — — — Mortgage, farmland 278 278 12 281 14 Mortgage, 1 to 4 family first liens 506 596 52 526 22 Mortgage, 1 to 4 family junior liens — — — — — Mortgage, multi-family — — — — — Mortgage, commercial 697 697 9 706 37 Loans to individuals — — — — — $ 2,667 $ 2,805 $ 154 $ 2,775 $ 139 Total: Agricultural $ 1,844 $ 1,943 $ 44 $ 1,716 $ 82 Commercial and financial 2,709 4,328 9 2,624 65 Real estate: Construction, 1 to 4 family residential 432 443 28 392 20 Construction, land development and commercial 128 220 — 142 — Mortgage, farmland 2,318 2,318 12 2,178 104 Mortgage, 1 to 4 family first liens 3,457 4,301 52 3,506 69 Mortgage, 1 to 4 family junior liens 369 673 — 386 — Mortgage, multi-family 5,525 5,632 — 5,598 249 Mortgage, commercial 3,987 5,285 9 4,240 90 Loans to individuals — 20 — — — $ 20,769 $ 25,163 $ 154 $ 20,782 $ 679 Information regarding impaired loans as of and for the year ended December 31, 2013 is as follows: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized (Amounts in Thousands) 2013 With no related allowance recorded: Agricultural $ — $ — $ — $ — $ — Commercial and financial 1,602 3,140 — 1,645 45 Real estate: Construction, 1 to 4 family residential 1,270 2,974 — 1,727 4 Construction, land development and commercial 140 140 — 229 — Mortgage, farmland — — — — — Mortgage, 1 to 4 family first liens 2,597 3,542 — 2,691 24 Mortgage, 1 to 4 family junior liens 177 451 — 198 — Mortgage, multi-family 456 1,068 — 666 — Mortgage, commercial 2,494 5,303 — 2,793 46 Loans to individuals — 20 — — — $ 8,736 $ 16,638 $ — $ 9,949 $ 119 With an allowance recorded: Agricultural $ 120 $ 120 $ 3 $ 123 $ 5 Commercial and financial 805 838 16 871 46 Real estate: Construction, 1 to 4 family residential — — — — — Construction, land development and commercial — — — — — Mortgage, farmland 284 284 14 289 14 Mortgage, 1 to 4 family first liens 1,768 1,897 66 1,821 79 Mortgage, 1 to 4 family junior liens — — — — — Mortgage, multi-family 5,608 5,608 188 5,673 255 Mortgage, commercial 9,205 9,205 17 9,300 535 Loans to individuals — — — — — $ 17,790 $ 17,952 $ 304 $ 18,077 $ 934 Total: Agricultural $ 120 $ 120 $ 3 $ 123 $ 5 Commercial and financial 2,407 3,978 16 2,516 91 Real estate: Construction, 1 to 4 family residential 1,270 2,974 — 1,727 4 Construction, land development and commercial 140 140 — 229 — Mortgage, farmland 284 284 14 289 14 Mortgage, 1 to 4 family first liens 4,365 5,439 66 4,512 103 Mortgage, 1 to 4 family junior liens 177 451 — 198 — Mortgage, multi-family 6,064 6,676 188 6,339 255 Mortgage, commercial 11,699 14,508 17 12,093 581 Loans to individuals — 20 — — — $ 26,526 $ 34,590 $ 304 $ 28,026 $ 1,053

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Major classes of property and equipment and the total accumulated depreciation	The major classes of property and equipment and the total accumulated depreciation are as follows: December 31, 2015 2014 (Amounts In Thousands) Land $ 8,996 $ 7,835 Buildings and improvements 33,178 29,402 Furniture and equipment 29,549 27,298 71,723 64,535 Less accumulated depreciation 38,201 35,464 Net $ 33,522 $ 29,071

Interest-Bearing Deposits (Tabl

Interest-Bearing Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Interest-bearing Deposit Liabilities [Abstract]
Deposits	A summary of these deposits is as follows: December 31, 2015 2014 (Amounts In Thousands) NOW and other demand $ 477,241 $ 450,486 Savings 644,115 588,781 Time, $100,000 and over 157,331 177,795 Other time 297,047 329,289 $ 1,575,734 $ 1,546,351
Time Deposits	Time deposits have a maturity as follows: December 31, 2015 2014 (Amounts In Thousands) Due in one year or less $ 195,369 $ 243,316 Due after one year through two years 113,438 128,927 Due after two years through three years 73,845 74,493 Due after three years through four years 21,821 43,490 Due over four years 49,905 16,858 $ 454,378 $ 507,084

Other Borrowings (Tables)

Other Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
Schedule of Short-term Debt	The following table sets forth selected information for other borrowings each of which having a maturity of less than one year: December 31, 2015 2014 (Amounts In Thousands) Federal funds purchased, secured by other securities (FHLB, FHLMC and FNMA) $ — $ 6,945 Repurchase agreements with customers, renewable daily, interest payable monthly, secured by other securities (FHLB, FHLMC and FNMA) 44,051 40,554 $ 44,051 $ 47,499

Federal Home Loan Bank Borrow33

Federal Home Loan Bank Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Federal Home Loan Banks [Abstract]
Schedule of federal home loan bank borrowings	As of December 31, 2015 and 2014 , the borrowings were as follows: 2015 2014 (Effective interest rates as of December 31, 2014) (Amounts In Thousands) Due 2015, 0.28% $ — $ 15,000 Due 2016, 4.46% to 4.66% 30,000 45,000 Due 2017, 4.09% to 4.89% 60,000 60,000 Due 2018, 3.65% 20,000 20,000 Due 2020, 3.05% 25,000 — Due 2025, 2.54% to 3.07% 90,000 — $ 225,000 $ 140,000

Accumulated Other Comprehensi34

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2015
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of accumulated other comprehensive income (AOCI)	The components of accumulated other comprehensive income (AOCI), included in stockholders’ equity, are as follows: December 31, 2015 2014 (amounts in thousands) Net unrealized gain on available-for-sale securities $ 2,244 $ 2,072 Net unrealized (loss) gain on derivatives used for cash flow hedges (4,180 ) (2,796 ) Tax effect 741 276 Net-of-tax amount $ (1,195 ) $ (448 )
Summary of amounts reclassified from AOCI	Amounts reclassified from AOCI and the affected line items in the statements of income during the years ended December 31, 2015 , 2014 and 2013 , were as follows: Amounts reclassified from AOCI Affected Line Item in the Statements of Income 2015 2014 2013 (amounts in thousands) Unrealized gains (losses) on available-for-sale securities $ — $ — $ 17 Other noninterest income Tax effect — — (7 ) Tax (expense) benefit Total reclassification out of AOCI $ — $ — $ 10

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Schedule of Employee Stock Ownership Plan (ESOP)	As of December 31, 2015 and 2014 , the shares held by the ESOP, fair value and maximum cash obligation were as follows: 2015 2014 Shares held by the ESOP 844,088 838,088 Fair value per share $ 44.50 $ 41.25 Maximum cash obligation $ 37,562,000 $ 34,571,000
Schedule of stock options activity	A summary of the stock options is as follows: Number of Shares Weighted- Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (In Thousands) Balance, December 31, 2012 35,970 $ 23.81 4.25 $ 856 Granted — Exercised (10,710 ) Balance, December 31, 2013 25,260 26.98 4.72 681 Granted — Exercised (5,880 ) Balance, December 31, 2014 19,380 29.92 5.03 580 Granted — Exercised — Balance, December 31, 2015 19,380 $ 29.92 4.03 $ 580
Significant assumptions	Expected dividend yield was based on historical dividend rates. Significant assumptions at date of grant include: 2015 2014 Risk-free interest rate n/a n/a Expected option life n/a n/a Expected volatility n/a n/a Expected dividends n/a n/a
Schedule of pertinent information related to the options outstanding	Other pertinent information related to the options outstanding at December 31, 2015 is as follows: Exercise Price Number Outstanding Remaining Contractual Life Number Exercisable $ 26.00 9,160 16 months 9,160 33.00 7,220 76 months — 34.50 3,000 82 months — 19,380 9,160

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Components of income tax	Income taxes for the years ended December 31, 2015 , 2014 and 2013 are summarized as follows: 2015 2014 2013 (Amounts In Thousands) Current: Federal $ 11,559 $ 9,412 $ 9,120 State 2,202 1,788 1,789 Deferred: Federal (1,114 ) (27 ) (78 ) State (178 ) (44 ) 81 $ 12,469 $ 11,129 $ 10,912
Schedule of deferred tax assets and liabilities	Deferred tax assets and liabilities at December 31, 2015 and 2014 were as follows: December 31, 2015 2014 (Amounts In Thousands) Deferred income tax assets: Allowance for loan losses $ 10,140 $ 9,188 Deferred compensation 2,909 2,718 Unrealized losses on interest rate swaps 1,599 1,069 Accrued expenses 1,140 1,099 State net operating loss 708 600 Gross deferred tax assets $ 16,496 $ 14,674 Valuation allowance (708 ) (600 ) Deferred tax asset, net of valuation allowance $ 15,788 $ 14,074 Deferred income tax liabilities: Property and equipment 1,910 1,878 Unrealized gains on investment securities 858 793 Goodwill 624 624 Other 701 841 Gross deferred tax liabilities $ 4,093 $ 4,136 Net deferred tax assets $ 11,695 $ 9,938
Summary of change in deferred income tax	The net change in the deferred income taxes for the years ended December 31, 2015 , 2014 and 2013 is reflected in the consolidated financial statements as follows: Year Ended December 31, 2015 2014 2013 (Amounts In Thousands) Consolidated statements of income $ 1,292 $ 71 $ (3 ) Consolidated statements of stockholders' equity 465 1,262 1,464 $ 1,757 $ 1,333 $ 1,461
Schedule of effective income tax rate reconciliation	Income tax expense for the years ended December 31, 2015 , 2014 and 2013 are less than the amounts computed by applying the maximum effective federal income tax rate to the income before income taxes because of the following items: 2015 2014 2013 Amount % Of Pretax Income Amount % Of Pretax Income Amount % Of Pretax Income (Amounts In Thousands) Expected tax expense $ 14,310 35.0 % $ 13,336 35.0 % $ 12,895 35.0 % Tax-exempt interest (1,776 ) (4.3 ) (1,788 ) (4.7 ) (1,690 ) (4.6 ) Interest expense limitation 97 0.2 96 0.3 99 0.3 State income taxes, net of federal income tax benefit 1,316 3.2 1,134 3.0 1,216 3.3 Income tax credits (1,426 ) (3.5 ) (1,546 ) (4.1 ) (1,992 ) (5.4 ) Other (52 ) (0.1 ) (103 ) (0.3 ) 384 1.0 $ 12,469 30.5 % $ 11,129 29.2 % $ 10,912 29.6 %

Regulatory Capital Requiremen37

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions (Tables)	12 Months Ended
	Dec. 31, 2015
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions [Abstract]
Schedule of minimum regulatory requirements	The actual amounts and capital ratios as of December 31, 2015 and 2014 , with the minimum regulatory requirements for the Company and Bank are presented below (amounts in thousands): Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Ratio Ratio As of December 31, 2015: Company: Total risk-based capital $ 334,899 15.82 % 8.00 % 10.00 % Tier 1 risk-based capital 308,432 14.57 6.00 8.00 Tier 1 common equity 308,432 14.57 4.50 6.50 Leverage ratio 308,432 12.53 4.00 5.00 Bank: Total risk-based capital 335,010 15.83 8.00 10.00 Tier 1 risk-based capital 308,562 14.58 6.00 8.00 Tier 1 common equity 308,562 14.58 4.50 6.50 Leverage ratio 308,562 12.54 4.00 5.00 Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Action Provisions Amount Ratio Ratio Ratio As of December 31, 2014: Company: Total risk-based capital $ 310,622 17.21 % 8.00 % 10.00 % Tier 1 risk-based capital 288,047 15.96 4.00 6.00 Leverage ratio 288,047 12.54 4.00 5.00 Bank: Total risk-based capital 310,066 17.19 8.00 10.00 Tier 1 risk-based capital 287,504 15.94 5.00 6.00 Leverage ratio 287,504 12.51 4.00 5.00

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	The following is an analysis of the changes in the loans to related parties during the years ended December 31, 2015 and 2014 : Year Ended December 31, 2015 2014 (Amounts In Thousands) Balance, beginning $ 19,246 $ 19,717 Net increase due to change in related parties — — Advances 24,523 11,760 Collections (16,765 ) (12,231 ) Balance, ending $ 27,004 $ 19,246

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Carrying value and estimated fair values of entity's financial instruments	The carrying value and estimated fair values of the Company’s financial instruments as of December 31, 2015 are as follows: December 31, 2015 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 $ 35,427 $ 35,427 $ 35,427 $ — $ — Investment securities 276,069 276,069 — 276,069 — Loans held for sale 5,554 5,554 — 5,554 — Loans Agricultural 98,506 98,530 — — 98,530 Commercial and financial 179,682 179,649 — — 179,649 Real estate: Construction, 1 to 4 family residential 50,480 50,487 — — 50,487 Construction, land development and commercial 81,707 81,705 — — 81,705 Mortgage, farmland 184,514 184,640 — — 184,640 Mortgage, 1 to 4 family first liens 720,229 718,566 — — 718,566 Mortgage, 1 to 4 family junior liens 116,632 122,173 — — 122,173 Mortgage, multi-family 270,261 272,446 — — 272,446 Mortgage, commercial 320,899 319,090 — — 319,090 Loans to individuals 23,518 23,509 — — 23,509 Obligations of state and political subdivisions 51,978 51,073 — — 51,073 Accrued interest receivable 8,672 8,672 — 8,672 — Total financial instrument assets $ 2,424,128 $ 2,427,590 $ 35,427 $ 290,295 $ 2,101,868 Financial instrument liabilities: Deposits Noninterest-bearing deposits $ 314,968 $ 314,968 $ — $ 314,968 $ — Interest-bearing deposits 1,575,734 1,577,684 — 1,577,684 — Other borrowings 44,051 44,051 — 44,051 — Federal Home Loan Bank borrowings 225,000 226,157 — 226,157 — Interest rate swaps 4,180 4,180 — 4,180 — Accrued interest payable 846 846 — 846 — Total financial instrument liabilities $ 2,164,779 $ 2,167,886 $ — $ 2,167,886 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 344,602 $ — $ — $ — $ — Letters of credit 11,718 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 356,320 $ — $ — $ — $ — (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, 2014 are as follows: December 31, 2014 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 $ 29,174 $ 29,174 $ 29,174 $ — $ — Investment securities 267,240 267,240 — 267,240 — Loans held for sale 4,476 4,476 — 4,476 — Loans Agricultural 95,130 95,126 — — 95,126 Commercial and financial 170,507 171,081 — — 171,081 Real estate: Construction, 1 to 4 family residential 45,139 45,159 — — 45,159 Construction, land development and commercial 75,589 75,623 — — 75,623 Mortgage, farmland 159,831 159,623 — — 159,623 Mortgage, 1 to 4 family first liens 666,406 665,428 — — 665,428 Mortgage, 1 to 4 family junior liens 109,133 115,726 — — 115,726 Mortgage, multi-family 243,723 246,191 — — 246,191 Mortgage, commercial 318,896 318,211 — — 318,211 Loans to individuals 21,043 21,016 — — 21,016 Obligations of state and political subdivisions 55,281 54,800 — — 54,800 Accrued interest receivable 8,276 8,276 — 8,276 — Total financial instrument assets $ 2,269,844 $ 2,277,150 $ 29,174 $ 279,992 $ 1,967,984 Financial instrument liabilities: Deposits Noninterest-bearing deposits 288,718 288,718 — 288,718 — Interest-bearing deposits 1,546,351 1,550,974 — 1,550,974 — Other borrowings 47,499 47,499 — 47,499 — Federal Home Loan Bank Borrowings 140,000 145,210 — 145,210 — Interest rate swaps 2,796 2,796 — 2,796 — Accrued interest payable 902 902 — 902 — Total financial instrument liabilities $ 2,026,266 $ 2,036,099 $ — $ 2,036,099 $ — Face Amount Financial instrument with off-balance sheet risk: Loan commitments $ 334,100 $ — $ — $ — $ — Letters of credit 12,437 — — — — Total financial instrument liabilities with off-balance-sheet risk $ 346,537 $ — $ — $ — $ — (1) Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”). (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market
Schedule of assets and liabilities measured at fair value on a recurring basis	The table below represents the balances of assets and liabilities measured at fair value on a recurring basis: December 31, 2015 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 $ — $ 24,978 $ — $ 24,978 State and political subdivisions — 173,929 — 173,929 Other securities (FHLB, FHLMC and FNMA) — 65,328 — 65,328 Derivative Financial Instruments Interest rate swaps — (4,180 ) — (4,180 ) Total $ — $ 260,055 $ — $ 260,055 December 31, 2014 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 $ — $ 22,333 $ — 22,333 State and political subdivisions — 168,968 — 168,968 Other securities (FHLB, FHLMC and FNMA) — 67,691 — 67,691 Derivative Financial Instruments Interest rate swaps — (2,796 ) — (2,796 ) Total $ — $ 256,196 $ — $ 256,196 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
Schedule of assets measured at fair value on a nonrecurring basis	For assets measured at fair value on a nonrecurring basis that were still held on the balance sheet at December 31, 2015 and 2014 , the following tables provide the level of valuation assumptions used to determine the adjustment and the carrying value of the related individual assets at year end. December 31, 2015 Year Ended December 31, 2015 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 1,470 $ 1,470 $ 116 Commercial and financial — — 1,178 1,178 56 Real Estate: Construction, 1 to 4 family residential — — 482 482 161 Construction, land development and commercial — — 132 132 35 Mortgage, farmland — — 2,233 2,233 — Mortgage, 1 to 4 family first liens — — 4,487 4,487 529 Mortgage, 1 to 4 family junior liens — — 286 286 166 Mortgage, multi-family — — 391 391 38 Mortgage, commercial — — 1,152 1,152 140 Loans to individuals — — — — — Foreclosed assets (5) — — 100 100 69 Total $ — $ — $ 11,911 $ 11,911 $ 1,310 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. (4) Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero. (5) Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets. December 31, 2014 Year Ended December 31, 2014 Readily Available Market Prices(1) Observable Market Prices(2) Company Determined Market Prices(3) Total at Fair Value Total Losses (Amounts in Thousands) Loans (4) Agricultural $ — $ — $ 1,679 1,679 $ 25 Commercial and financial — — 1,709 $ 1,709 206 Real Estate: Construction, 1 to 4 family residential — — 315 $ 315 — Construction, land development and commercial — — — — — Mortgage, farmland — — 2,040 $ 2,040 — Mortgage, 1 to 4 family first liens — — 2,500 2,500 576 Mortgage, 1 to 4 family junior liens — — 369 $ 369 24 Mortgage, multi-family — — 5,525 5,525 — Mortgage, commercial — — 1,918 $ 1,918 328 Loans to individuals — — — — — Foreclosed assets (5) — — 301 $ 301 210 Total $ — $ — $ 16,356 $ 16,356 $ 1,369 (1) Considered Level 1 under ASC 820. (2) Considered Level 2 under ASC 820. (3) Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market. (4) Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero. (5) Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.

Parent Company Only Financial40

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
CONDENSED BALANCE SHEETS	ASSETS 2015 2014 Cash and cash equivalents at subsidiary bank $ 843 $ 1,881 Investment in subsidiary bank 309,866 289,556 Other assets 1,553 1,527 Total assets $ 312,262 $ 292,964 LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities $ 2,525 $ 2,361 Redeemable common stock held by ESOP 37,562 34,571 Stockholders' equity: Capital stock 43,697 42,925 Retained earnings 294,487 271,924 Accumulated other comprehensive (loss) income (1,195 ) (448 ) Treasury stock at cost (27,252 ) (23,798 ) 309,737 290,603 Less maximum cash obligation related to ESOP shares 37,562 34,571 Total stockholders' equity 272,175 256,032 Total liabilities and stockholders' equity $ 312,262 $ 292,964
CONDENSED STATEMENTS OF INCOME	2015 2014 2013 Dividends received from subsidiary $ 7,364 $ 7,438 $ 5,213 Other expenses (713 ) (637 ) (471 ) Income before income tax benefit and equity in undistributed income of subsidiary 6,651 6,801 4,742 Income tax benefit 338 254 141 6,989 7,055 4,883 Equity in undistributed income of subsidiary 21,429 19,919 21,048 Net income $ 28,418 $ 26,974 $ 25,931
CONDENSED STATEMENTS OF CASH FLOWS	2015 2014 2013 Cash flows from operating activities: Net income $ 28,418 $ 26,974 $ 25,931 Adjustments to reconcile net income to cash and cash equivalents provided by operating activities: Equity in undistributed income of subsidiary (21,429 ) (19,919 ) (21,048 ) Share-based compensation 29 29 28 Compensation expensed through issuance of common stock 1,153 1,045 467 Excess tax benefits related to share-based compensation (8 ) (60 ) (92 ) Forfeiture of common stock (37 ) (40 ) (35 ) Increase (decrease) in other assets (27 ) (63 ) 647 Increase in other liabilities 164 170 59 Net cash and cash equivalents provided by operating activities 8,263 8,136 5,957 Cash flows from financing activities: Stock options exercised — 101 175 Excess tax benefits related to share-based compensation 8 60 92 Purchase of treasury stock (3,454 ) (4,014 ) (1,387 ) Dividends paid (5,855 ) (5,420 ) (5,186 ) Net cash and cash equivalents used by financing activities (9,301 ) (9,273 ) (6,306 ) Decrease in cash and cash equivalents (1,038 ) (1,137 ) (349 ) Cash and cash equivalents: Beginning of year 1,881 3,018 3,367 Ending of year $ 843 $ 1,881 $ 3,018

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of banks commitments	A summary of the Bank’s commitments at December 31, 2015 and 2014 is as follows: 2015 2014 (Amounts In Thousands) Firm loan commitments and unused portion of lines of credit: Home equity loans $ 44,376 $ 40,484 Credit cards 41,518 46,573 Commercial, real estate and home construction 98,613 81,613 Commercial lines and real estate purchase loans 160,095 165,430 Outstanding letters of credit 11,718 12,437
Non-cancelable leases relating to Bank premises	The minimum future rental commitments as of December 31, 2015 for all non-cancelable leases relating to Bank premises were as follows: Year ending December 31: (Amounts In Thousands) 2016 $ 448 2017 317 2018 287 2019 75 2020 1 Thereafter — $ 1,128

Quarterly Results of Operatio42

Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts) (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations	Quarter Ended March June September December Year 2015 Interest income $ 22,214 $ 23,027 $ 23,295 $ 23,631 $ 92,167 Interest expense 3,635 3,659 3,714 $ 3,959 14,967 Net interest income $ 18,579 $ 19,368 $ 19,581 $ 19,672 $ 77,200 Provision for loan losses (62 ) 517 (95 ) 1,295 1,655 Other income 4,990 5,506 5,218 5,088 20,802 Other expense 13,199 13,504 13,672 15,085 55,460 Income before income taxes $ 10,432 $ 10,853 $ 11,222 $ 8,380 40,887 Income taxes 3,052 3,383 3,537 2,497 12,469 Net income $ 7,380 $ 7,470 $ 7,685 $ 5,883 $ 28,418 Basic earnings per share $ 0.79 $ 0.80 $ 0.82 $ 0.63 $ 3.04 Diluted earnings per share 0.79 0.80 0.82 0.63 3.04 2014 Interest income $ 20,865 $ 21,473 $ 21,794 $ 22,450 $ 86,582 Interest expense 3,850 3,760 3,704 $ 3,723 15,037 Net interest income $ 17,015 $ 17,713 $ 18,090 $ 18,727 $ 71,545 Provision for loan losses 45 (246 ) (1,008 ) 2,251 1,042 Other income 4,421 4,947 5,247 4,741 19,356 Other expense 12,258 12,537 12,821 14,140 51,756 Income before income taxes $ 9,133 $ 10,369 $ 11,524 $ 7,077 38,103 Income taxes 2,389 3,188 3,625 1,927 11,129 Net income $ 6,744 $ 7,181 $ 7,899 $ 5,150 $ 26,974 Basic earnings per share $ 0.72 $ 0.76 $ 0.85 $ 0.55 $ 2.88 Diluted earnings per share 0.72 0.76 0.84 0.55 2.87

Derivative Financial Instrume43

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
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 edges as of December 31, 2015 and 2014 : Notional Amount Fair Value Balance Sheet Category Maturity (Amounts in Thousands) December 31, 2015 Interest rate swap $ 25,000 $ (1,501 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (2,679 ) Other Liabilities 11/7/2023 December 31, 2014 Interest rate swap 25,000 $ (864 ) Other Liabilities 11/9/2020 Interest rate swap 25,000 (1,932 ) Other Liabilities 11/7/2023
Identification of the gains and losses recognized on the derivative instruments designated as cash flow hedges	The table below identifies the gains and losses recognized on the Bank’s derivative instruments designated as cash flow hedges for the year ended December 31, 2015 and 2014 : Effective Portion Ineffective Portion Recognized in OCI Reclassified from AOCI into Income Recognized in Income on Derivatives Amount of Gain (Loss) Category Amount of Gain (Loss) Category Amount of Gain (Loss) (Amounts in Thousands) December 31, 2015 Interest rate swap $ (394 ) Interest Expense $ — Other Income $ — Interest rate swap (461 ) Interest Expense — Other Income — December 31, 2014 Interest rate swap (754 ) Interest Expense — Other Income — Interest rate swap (1,448 ) Interest Expense — Other Income —

Nature of Activities and Sign44

Nature of Activities and Significant Accounting Policies (Details)	Mar. 24, 2015	Dec. 31, 2015propertysegment	Dec. 31, 2014
Nature of activities
Number of Reportable Segments | segment		1
Loans
Period of past due loans considered as impaired		90 days
Tax credit real estate
Number of multi family rental properties		2
Number of assisted living rental properties		3
Number of multi tenant rental properties for persons with disabilities		1
Number of multi family senior living rental properties		1
Ownership interest in each limited partnership (or greater)		99.00%
Duration of tax credit of each property		10 years
Deferred income taxes
Recognized income tax positions, maximum realized (in hundredths)		50.00%
Earnings per share
Stock split conversion ratio	2
Building and Improvements [Member] | Minimum [Member]
Property and equipment
Estimated useful lives		7 years	7 years
Building and Improvements [Member] | Maximum [Member]
Property and equipment
Estimated useful lives		40 years	40 years
Furniture and Equipment [Member] | Minimum [Member]
Property and equipment
Estimated useful lives		3 years	3 years
Furniture and Equipment [Member] | Maximum [Member]
Property and equipment
Estimated useful lives		10 years	10 years

Nature of Activities and Sign45

Nature of Activities and Significant Accounting Policies - Earning per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Computation of weighted average number of basic and diluted shares:
Common shares outstanding at the beginning of the year									9,380,432	9,455,250	9,424,656
Weighted average number of net shares redeemed									(36,296)	(67,022)	(4,220)
Weighted average shares outstanding (basic)									9,344,136	9,388,228	9,420,436
Weighted average of potential dilutive shares attributable to stock options granted, computed under the treasury stock method									5,391	4,700	7,270
Weighted average number of shares (diluted)									9,349,527	9,392,928	9,427,706
Net income	$ 5,883	$ 7,685	$ 7,470	$ 7,380	$ 5,150	$ 7,899	$ 7,181	$ 6,744	$ 28,418	$ 26,974	$ 25,931
Earnings per share:
Basic (in dollars per share)	$ 0.63	$ 0.82	$ 0.80	$ 0.79	$ 0.55	$ 0.85	$ 0.76	$ 0.72	$ 3.04	$ 2.88	$ 2.76
Diluted (in dollars per share)	$ 0.63	$ 0.82	$ 0.80	$ 0.79	$ 0.55	$ 0.84	$ 0.76	$ 0.72	$ 3.04	$ 2.87	$ 2.75

Investment Securities - Carryin

Investment Securities - Carrying Values of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities [Abstract]
Investment in subsidiary bank	$ 264,235	$ 258,992
Securities available for sale, Percent	100.00%	100.00%
US Treasury [Member]
Available-for-sale Securities [Abstract]
Investment in subsidiary bank	$ 24,978	$ 22,333
Securities available for sale, Percent	9.45%	8.62%
Other securities (FHLB, FHLMC and FNMA) [Member]
Available-for-sale Securities [Abstract]
Investment in subsidiary bank	$ 65,328	$ 67,691
Securities available for sale, Percent	24.72%	26.14%
State and political subdivisions [Member]
Available-for-sale Securities [Abstract]
Investment in subsidiary bank	$ 173,929	$ 168,968
Securities available for sale, Percent	65.83%	65.24%

Investment Securities - Carry47

Investment Securities - Carrying Amount of Available-for-Sale Securities and Approximate Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 261,991	$ 256,920
Gross Unrealized Gains	2,548	2,664
Gross Unrealized (Losses)	(304)	(592)
Estimated Fair Value	264,235	258,992
US Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,893	22,351
Gross Unrealized Gains	92	18
Gross Unrealized (Losses)	(7)	(36)
Estimated Fair Value	24,978	22,333
Other securities (FHLB, FHLMC and FNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	65,400	67,644
Gross Unrealized Gains	81	147
Gross Unrealized (Losses)	(153)	(100)
Estimated Fair Value	65,328	67,691
State and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	171,698	166,925
Gross Unrealized Gains	2,375	2,499
Gross Unrealized (Losses)	(144)	(456)
Estimated Fair Value	$ 173,929	$ 168,968

Investment Securities - Availab

Investment Securities - Available-for-Sale Securities Classified as per Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amortized Cost
Due in one year or less	$ 42,538
Due after one year through five years	146,953
Due after five years through ten years	70,672
Due over ten years	1,828
Amortized Cost	261,991	$ 256,920
Fair Value
Due in one year or less	42,577
Due after one year through five years	148,176
Due after five years through ten years	71,653
Due over ten years	1,829
Total	$ 264,235	$ 258,992

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) $ in Thousands	Dec. 31, 2015USD ($)
Collateralized Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Carrying value of investment securities pledged to collateralize short-term borrowings	$ 69,520

Investment Securities - Sales P

Investment Securities - Sales Proceeds and Gross Realized Gains and Losses on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Sales proceeds	$ 0	$ 0	$ 566
Gross realized gains	0	0	17
Gross realized losses	$ 0	$ 0	$ 0

Investment Securities - Avail51

Investment Securities - Available-for-Sale Securities, Continuous Unrealized Loss Position, Fair Value (Details) $ in Thousands	Dec. 31, 2015USD ($)security	Dec. 31, 2014USD ($)security
Less than 12 months [Abstract]
Number of securities | security	74	106
Fair Value	$ 57,842	$ 58,502
Unrealized Loss	$ (230)	$ (260)
Percent of Unrealized Loss	0.40%	0.44%
12 months or more [Abstract]
Number of securities | security	27	78
Fair Value	$ 5,633	$ 16,154
Unrealized Loss	$ (74)	$ (332)
Percent of Unrealized Loss	1.31%	2.06%
Total [Abstract]
Number of securities | security	101	184
Fair Value	$ 63,475	$ 74,656
Unrealized Loss	$ (304)	$ (592)
Percent of Unrealized Loss	0.48%	0.79%
US Treasury Securities [Member]
Less than 12 months [Abstract]
Number of securities | security	3	5
Fair Value	$ 7,455	$ 12,396
Unrealized Loss	$ (7)	$ (36)
Percent of Unrealized Loss	0.09%	0.29%
12 months or more [Abstract]
Number of securities | security	0	0
Fair Value	$ 0	$ 0
Unrealized Loss	$ 0	$ 0
Percent of Unrealized Loss	0.00%	0.00%
Total [Abstract]
Number of securities | security	3	5
Fair Value	$ 7,455	$ 12,396
Unrealized Loss	$ (7)	$ (36)
Percent of Unrealized Loss	0.09%	0.29%
Other securities (FHLB, FHLMC and FNMA) [Member]
Less than 12 months [Abstract]
Number of securities | security	15	10
Fair Value	$ 36,830	$ 24,382
Unrealized Loss	$ (153)	$ (100)
Percent of Unrealized Loss	0.42%	0.41%
12 months or more [Abstract]
Number of securities | security	0	0
Fair Value	$ 0	$ 0
Unrealized Loss	$ 0	$ 0
Percent of Unrealized Loss	0.00%	0.00%
Total [Abstract]
Number of securities | security	15	10
Fair Value	$ 36,830	$ 24,382
Unrealized Loss	$ (153)	$ (100)
Percent of Unrealized Loss	0.42%	0.41%
State and political subdivisions [Member]
Less than 12 months [Abstract]
Number of securities | security	56	91
Fair Value	$ 13,557	$ 21,724
Unrealized Loss	$ (70)	$ (124)
Percent of Unrealized Loss	0.52%	0.57%
12 months or more [Abstract]
Number of securities | security	27	78
Fair Value	$ 5,633	$ 16,154
Unrealized Loss	$ (74)	$ (332)
Percent of Unrealized Loss	1.31%	2.06%
Total [Abstract]
Number of securities | security	83	169
Fair Value	$ 19,190	$ 37,878
Unrealized Loss	$ (144)	$ (456)
Percent of Unrealized Loss	0.75%	1.20%

Loans - Classes of Loans (Detai

Loans - Classes of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of classes of loans [Abstract]
Loans and receivable	$ 2,124,916	$ 1,984,698	$ 1,826,156
Net unamortized fees and costs	768	691
Loans and receivable, gross	2,125,684	1,985,389
Less allowance for loan losses	26,510	24,020
Loans and receivable, net	2,099,174	1,961,369
Agricultural [Member]
Summary of classes of loans [Abstract]
Loans and receivable	101,588	97,645	82,138
Commercial and financial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	184,199	174,738	166,102
Construction, 1 to 4 family residential [Member]
Summary of classes of loans [Abstract]
Loans and receivable	51,346	45,949
Construction, land development and commercial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	83,121	77,020
Mortgage, farmland [Member]
Summary of classes of loans [Abstract]
Loans and receivable	187,856	162,503	$ 142,685
Mortgage, 1 to 4 family first liens [Member]
Summary of classes of loans [Abstract]
Loans and receivable	727,160	672,674
Mortgage, 1 to 4 family junior liens [Member]
Summary of classes of loans [Abstract]
Loans and receivable	117,873	110,284
Mortgage, multi-family [Member]
Summary of classes of loans [Abstract]
Loans and receivable	271,974	245,213
Mortgage, commercial [Member]
Summary of classes of loans [Abstract]
Loans and receivable	323,409	321,601
Loans to individuals [Member]
Summary of classes of loans [Abstract]
Loans and receivable	24,019	21,342
Obligations of state and political subdivisions [Member]
Summary of classes of loans [Abstract]
Loans and receivable	$ 52,371	$ 55,729

Loans - Allowance For Credit Lo

Loans - Allowance For Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for loan losses:
Beginning balance	$ 24,020	$ 25,550	$ 25,160
Charge-offs	(3,405)	(5,549)	(3,346)
Recoveries	4,240	2,977	2,605
Provision	1,655	1,042	1,131
Ending balance	26,510	24,020	25,550
Ending balance, individually evaluated for impairment	883	154	304
Ending balance, collectively evaluated for impairment	25,627	23,866	25,246
Loan balances:
Ending balance	2,124,916	1,984,698	1,826,156
Ending balance, individually evaluated for impairment	16,261	20,769	26,526
Ending balance, collectively evaluated for impairment	2,108,655	1,963,929	1,799,630
Agricultural [Member]
Allowance for loan losses:
Beginning balance	2,515	2,852	1,653
Charge-offs	(325)	(174)	0
Recoveries	123	66	35
Provision	769	(229)	1,164
Ending balance	3,082	2,515	2,852
Ending balance, individually evaluated for impairment	1	44	3
Ending balance, collectively evaluated for impairment	3,081	2,471	2,849
Loan balances:
Ending balance	101,588	97,645	82,138
Ending balance, individually evaluated for impairment	1,710	1,844	120
Ending balance, collectively evaluated for impairment	99,878	95,801	82,018
Commercial and Financial [Member]
Allowance for loan losses:
Beginning balance	4,231	4,733	4,573
Charge-offs	(526)	(3,388)	(1,692)
Recoveries	1,370	1,128	1,002
Provision	(558)	1,758	850
Ending balance	4,517	4,231	4,733
Ending balance, individually evaluated for impairment	324	9	16
Ending balance, collectively evaluated for impairment	4,193	4,222	4,717
Loan balances:
Ending balance	184,199	174,738	166,102
Ending balance, individually evaluated for impairment	2,110	2,709	2,407
Ending balance, collectively evaluated for impairment	182,089	172,029	163,695
Real Estate: Construction and land development [Member]
Allowance for loan losses:
Beginning balance	2,241	2,918	3,175
Charge-offs	(285)	(250)	(245)
Recoveries	501	390	323
Provision	(177)	(817)	(335)
Ending balance	2,280	2,241	2,918
Ending balance, individually evaluated for impairment	22	28	0
Ending balance, collectively evaluated for impairment	2,258	2,213	2,918
Loan balances:
Ending balance	134,467	122,969	99,491
Ending balance, individually evaluated for impairment	954	560	1,410
Ending balance, collectively evaluated for impairment	133,513	122,409	98,081
Real Estate: Mortgage, farmland [Member]
Allowance for loan losses:
Beginning balance	2,672	2,557	1,746
Charge-offs	0	0	0
Recoveries	6	0	0
Provision	664	115	811
Ending balance	3,342	2,672	2,557
Ending balance, individually evaluated for impairment	0	12	14
Ending balance, collectively evaluated for impairment	3,342	2,660	2,543
Loan balances:
Ending balance	187,856	162,503	142,685
Ending balance, individually evaluated for impairment	2,233	2,318	284
Ending balance, collectively evaluated for impairment	185,623	160,185	142,401
Real Estate: Mortgage, 1 to 4 family [Member]
Allowance for loan losses:
Beginning balance	7,419	7,064	8,088
Charge-offs	(1,108)	(1,195)	(887)
Recoveries	762	870	618
Provision	1,099	680	(755)
Ending balance	8,172	7,419	7,064
Ending balance, individually evaluated for impairment	326	52	66
Ending balance, collectively evaluated for impairment	7,846	7,367	6,998
Loan balances:
Ending balance	845,033	782,958	711,472
Ending balance, individually evaluated for impairment	5,926	3,826	4,542
Ending balance, collectively evaluated for impairment	839,107	779,132	706,930
Real Estate: Mortgage, multi-family and commercial [Member]
Allowance for loan losses:
Beginning balance	4,195	4,787	5,104
Charge-offs	(723)	(217)	(356)
Recoveries	1,310	377	464
Provision	(559)	(752)	(425)
Ending balance	4,223	4,195	4,787
Ending balance, individually evaluated for impairment	110	9	205
Ending balance, collectively evaluated for impairment	4,113	4,186	4,582
Loan balances:
Ending balance	595,383	566,814	559,277
Ending balance, individually evaluated for impairment	3,228	9,512	17,763
Ending balance, collectively evaluated for impairment	592,155	557,302	541,514
Others [Member]
Allowance for loan losses:
Beginning balance	747	639	821
Charge-offs	(438)	(325)	(166)
Recoveries	168	146	163
Provision	417	287	(179)
Ending balance	894	747	639
Ending balance, individually evaluated for impairment	100	0	0
Ending balance, collectively evaluated for impairment	794	747	639
Loan balances:
Ending balance	76,390	77,071	64,991
Ending balance, individually evaluated for impairment	100	0	0
Ending balance, collectively evaluated for impairment	$ 76,290	$ 77,071	$ 64,991

Loans - Credit Quality Indicato

Loans - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	$ 2,124,916	$ 1,984,698	$ 1,826,156
Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	101,588	97,645	82,138
Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	184,199	174,738	166,102
Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	51,346	45,949
Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	83,121	77,020
Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	187,856	162,503	$ 142,685
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	727,160	672,674
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	117,873	110,284
Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	271,974	245,213
Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	323,409	321,601
Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	24,019	21,342
Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	52,371	55,729
Excellent [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	29,829	34,766
Excellent [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,786	1,375
Excellent [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,298	4,820
Excellent [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Excellent [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	260	276
Excellent [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	2,559	2,867
Excellent [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	426	474
Excellent [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Excellent [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	6,651	7,011
Excellent [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	12,484	15,416
Excellent [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	87
Excellent [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	2,365	2,440
Good [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	300,564	338,238
Good [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	15,959	13,214
Good [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	38,764	37,941
Good [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,898	6,893
Good [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	11,570	13,875
Good [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	31,186	36,680
Good [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	15,773	22,094
Good [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	2,992	2,875
Good [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	64,002	73,852
Good [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	81,305	87,612
Good [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	70	94
Good [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	37,045	43,108
Satisfactory [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,455,498	1,315,413
Satisfactory [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	36,819	51,107
Satisfactory [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	102,188	94,158
Satisfactory [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	34,357	27,738
Satisfactory [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	52,731	47,852
Satisfactory [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	112,038	103,552
Satisfactory [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	620,731	571,546
Satisfactory [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	107,091	99,095
Satisfactory [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	166,193	111,650
Satisfactory [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	187,728	178,069
Satisfactory [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	23,197	20,465
Satisfactory [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	12,425	10,181
Monitor [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	215,156	165,098
Monitor [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	18,064	15,243
Monitor [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	27,181	20,445
Monitor [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	8,684	8,435
Monitor [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	11,550	2,811
Monitor [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	27,304	11,754
Monitor [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	55,499	41,805
Monitor [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,198	3,377
Monitor [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	29,732	35,812
Monitor [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	32,141	25,165
Monitor [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	285	251
Monitor [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	518	0
Special Mention [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	86,489	89,856
Special Mention [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	25,356	13,070
Special Mention [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	8,231	11,031
Special Mention [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	5,842	1,881
Special Mention [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	6,542	11,870
Special Mention [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	11,181	4,721
Special Mention [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	16,237	18,428
Special Mention [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,846	2,520
Special Mention [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,873	16,611
Special Mention [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	6,183	9,371
Special Mention [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	198	353
Special Mention [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	0	0
Substandard [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	37,380	41,327
Substandard [Member] | Agricultural [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,604	3,636
Substandard [Member] | Commercial and Financial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	4,537	6,343
Substandard [Member] | Real Estate: Construction, 1 to 4 family residential [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	565	1,002
Substandard [Member] | Real Estate: Construction, land development and commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	468	336
Substandard [Member] | Real Estate: Mortgage, farmland [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,588	2,929
Substandard [Member] | Real Estate: Mortgage, 1 to 4 family first liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	18,494	18,327
Substandard [Member] | Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	1,746	2,417
Substandard [Member] | Real Estate: Mortgage, multi-family [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	523	277
Substandard [Member] | Real Estate: Mortgage, commercial [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	3,568	5,968
Substandard [Member] | Loans to individuals [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	269	92
Substandard [Member] | Obligations of state and political subdivisions [Member]
Summary of credit quality indicators by type of loans [Abstract]
Loans and receivable	$ 18	$ 0

Loans - Past Due Receivables (D

Loans - Past Due Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	$ 10,340	$ 6,558
60 - 89 Days Past Due	2,365	2,359
90 Days or More Past Due	4,253	2,908
Total Past Due	16,958	11,825
Current	2,107,958	1,972,873
Ending balance	2,124,916	1,984,698	$ 1,826,156
Accruing Loans Past Due 90 Days or More	467	348
Agricultural [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	3,064	310
60 - 89 Days Past Due	961	99
90 Days or More Past Due	0	0
Total Past Due	4,025	409
Current	97,563	97,236
Ending balance	101,588	97,645	82,138
Accruing Loans Past Due 90 Days or More	0	0
Commercial and financial [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	854	397
60 - 89 Days Past Due	71	14
90 Days or More Past Due	1,312	1,048
Total Past Due	2,237	1,459
Current	181,962	173,279
Ending balance	184,199	174,738	166,102
Accruing Loans Past Due 90 Days or More	0	0
Construction, 1 to 4 family residential [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
90 Days or More Past Due	214	0
Total Past Due	214	0
Current	51,132	45,949
Ending balance	51,346	45,949
Accruing Loans Past Due 90 Days or More	0	0
Construction, land development and commercial [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	0	937
60 - 89 Days Past Due	0	0
90 Days or More Past Due	88	0
Total Past Due	88	937
Current	83,033	76,083
Ending balance	83,121	77,020
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, farmland [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	320	753
60 - 89 Days Past Due	88	0
90 Days or More Past Due	0	0
Total Past Due	408	753
Current	187,448	161,750
Ending balance	187,856	162,503	$ 142,685
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, 1 to 4 family first liens [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	4,526	3,594
60 - 89 Days Past Due	1,192	1,656
90 Days or More Past Due	2,085	1,582
Total Past Due	7,803	6,832
Current	719,357	665,842
Ending balance	727,160	672,674
Accruing Loans Past Due 90 Days or More	406	348
Mortgage, 1 to 4 family junior liens [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	250	181
60 - 89 Days Past Due	13	12
90 Days or More Past Due	110	244
Total Past Due	373	437
Current	117,500	109,847
Ending balance	117,873	110,284
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, multi-family [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	135	0
60 - 89 Days Past Due	0	21
90 Days or More Past Due	113	0
Total Past Due	248	21
Current	271,726	245,192
Ending balance	271,974	245,213
Accruing Loans Past Due 90 Days or More	0	0
Mortgage, commercial [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	1,033	359
60 - 89 Days Past Due	0	557
90 Days or More Past Due	331	34
Total Past Due	1,364	950
Current	322,045	320,651
Ending balance	323,409	321,601
Accruing Loans Past Due 90 Days or More	61	0
Loans to individuals [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	158	27
60 - 89 Days Past Due	40	0
90 Days or More Past Due	0	0
Total Past Due	198	27
Current	23,821	21,315
Ending balance	24,019	21,342
Accruing Loans Past Due 90 Days or More	0	0
Obligations of state and political subdivisions [Member]
Schedule of past due loans [Abstract]
30 - 59 Days Past Due	0	0
60 - 89 Days Past Due	0	0
90 Days or More Past Due	0	0
Total Past Due	0	0
Current	52,371	55,729
Ending balance	52,371	55,729
Accruing Loans Past Due 90 Days or More	$ 0	$ 0

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Accruing loans past due 90 days or more decreased	$ 120,000
Accruing loans past due 90 days or more percentage of total loans (in hundredths)	0.02%	0.02%
Average 90 days or more past due loan balance	$ 90,000	$ 70,000
TDR loans default payment	0
Impaired loans decrease	4,610,000
Decrease in TDR loans	$ 6,060,000
Prior period within which impairment is being measured	1 year
Number of period within which average appraisals obtained	1 month

Loans - Impaired Financing Rece

Loans - Impaired Financing Receivable Loan Type (Details) - USD ($) $ in Thousands	Dec. 31, 2015		Dec. 31, 2014
Summary of certain impaired loan information [Abstract]
Non-accrual loans	$ 7,415	[1]	$ 6,081
Accruing loans past due 90 days or more	467		348
TDR loans	8,279		14,340
Agricultural [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	[1]	0
Accruing loans past due 90 days or more	0		0
TDR loans	1,710		1,942
Commercial and financial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	1,498	[1]	1,343
Accruing loans past due 90 days or more	0		0
TDR loans	612		1,366
Construction, 1 to 4 family residential [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	214	[1]	0
Accruing loans past due 90 days or more	0		0
TDR loans	473		431
Construction, land development and commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	145	[1]	127
Accruing loans past due 90 days or more	0		0
TDR loans	122		0
Mortgage, farmland [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	[1]	0
Accruing loans past due 90 days or more	0		0
TDR loans	2,233		2,220
Mortgage, 1 to 4 family first liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	3,845	[1]	1,912
Accruing loans past due 90 days or more	406		348
TDR loans	1,369		1,199
Mortgage, 1 to 4 family junior liens [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	279	[1]	369
Accruing loans past due 90 days or more	0		0
TDR loans	27		0
Mortgage, multi-family [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	449	[1]	55
Accruing loans past due 90 days or more	0		0
TDR loans	0		5,470
Mortgage, commercial [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	985	[1]	2,275
Accruing loans past due 90 days or more	61		0
TDR loans	1,733		1,712
Loans to individuals [Member]
Summary of certain impaired loan information [Abstract]
Non-accrual loans	0	[1]	0
Accruing loans past due 90 days or more	0		0
TDR loans	0		0
Troubled Debt Restructuring [Member]
Summary of certain impaired loan information [Abstract]
TDR Loans included within nonaccrual loans	$ 2,310		$ 2,140
[1]	There were $2.31 million and $2.14 million of TDR loans included within nonaccrual loans as of December 31, 2015 and 2014, respectively.

Loans - Troubled Debt Restructu

Loans - Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)contract	Dec. 31, 2014USD ($)contract
Summary of information for TDR loans [Abstract]
Number of contracts | contract	50	52
Recorded investment	$ 10,592	$ 16,482
Commitments outstanding	$ 411	$ 501
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	17	25
Pre-modification recorded investment	$ 2,354	$ 6,395
Post-modification recorded investment	$ 2,111	$ 6,383
Agricultural [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	7	9
Recorded investment	$ 1,710	$ 1,942
Commitments outstanding	$ 32	$ 272
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	3	8
Pre-modification recorded investment	$ 279	$ 2,033
Post-modification recorded investment	$ 163	$ 2,033
Commercial and financial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	8	13
Recorded investment	$ 1,818	$ 2,202
Commitments outstanding	$ 241	$ 53
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	2	5
Pre-modification recorded investment	$ 676	$ 803
Post-modification recorded investment	$ 663	$ 803
Construction, 1 to 4 family residential [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	3	3
Recorded investment	$ 646	$ 431
Commitments outstanding	$ 138	$ 111
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	1	3
Pre-modification recorded investment	$ 277	$ 443
Post-modification recorded investment	$ 277	$ 431
Construction, land development and commercial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	1	1
Recorded investment	$ 122	$ 127
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	0	1
Pre-modification recorded investment	$ 0	$ 132
Post-modification recorded investment	$ 0	$ 132
Mortgage, farmland [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	5	4
Recorded investment	$ 2,233	$ 2,220
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	2	3
Pre-modification recorded investment	$ 513	$ 2,007
Post-modification recorded investment	$ 399	$ 2,007
Mortgage, 1 to 4 family first liens [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	13	11
Recorded investment	$ 1,575	$ 1,467
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	4	3
Pre-modification recorded investment	$ 353	$ 433
Post-modification recorded investment	$ 353	$ 433
Mortgage, 1 to 4 family junior liens [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	2	1
Recorded investment	$ 36	$ 225
Commitments outstanding	$ 0	$ 65
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	2	1
Pre-modification recorded investment	$ 41	$ 225
Post-modification recorded investment	$ 41	$ 225
Mortgage, multi-family [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	1	2
Recorded investment	$ 71	$ 5,470
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	1	0
Pre-modification recorded investment	$ 71	$ 0
Post-modification recorded investment	$ 71	$ 0
Mortgage, commercial [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	10	8
Recorded investment	$ 2,381	$ 2,398
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	2	1
Pre-modification recorded investment	$ 144	$ 319
Post-modification recorded investment	$ 144	$ 319
Loans to individuals [Member]
Summary of information for TDR loans [Abstract]
Number of contracts | contract	0	0
Recorded investment	$ 0	$ 0
Commitments outstanding	$ 0	$ 0
Summary of TDR loans were modified [Abstract]
Number of Contracts | contract	0	0
Pre-modification recorded investment	$ 0	$ 0
Post-modification recorded investment	$ 0	$ 0

Loans - Impaired Financing Re59

Loans - Impaired Financing Receivables Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Recorded Investment
With no related allowance recorded	$ 11,288	$ 18,102	$ 8,736
With a related allowance recorded	4,973	2,667	17,790
Total	16,261	20,769	26,526
Unpaid Principal Balance
With no related allowance recorded	14,840	22,358	16,638
With a related allowance recorded	5,355	2,805	17,952
Total	20,195	25,163	34,590
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	883	154	304
Total	883	154	304
Average Recorded Investment
With no related allowance recorded	11,774	18,007	9,949
With an related allowance recorded	5,272	2,775	18,077
Total	17,046	20,782	28,026
Interest Income Recognized
With no related allowance recorded	304	540	119
With an related allowance recorded	126	139	934
Total	430	679	1,053
Agricultural [Member]
Recorded Investment
With no related allowance recorded	1,609	1,634	0
With a related allowance recorded	101	210	120
Total	1,710	1,844	120
Unpaid Principal Balance
With no related allowance recorded	1,773	1,696	0
With a related allowance recorded	101	247	120
Total	1,874	1,943	120
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	1	44	3
Total	1	44	3
Average Recorded Investment
With no related allowance recorded	1,620	1,496	0
With an related allowance recorded	106	220	123
Total	1,726	1,716	123
Interest Income Recognized
With no related allowance recorded	80	71	0
With an related allowance recorded	5	11	5
Total	85	82	5
Commercial and financial [Member]
Recorded Investment
With no related allowance recorded	1,263	2,076	1,602
With a related allowance recorded	847	633	805
Total	2,110	2,709	2,407
Unpaid Principal Balance
With no related allowance recorded	1,981	3,695	3,140
With a related allowance recorded	847	633	838
Total	2,828	4,328	3,978
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	324	9	16
Total	324	9	16
Average Recorded Investment
With no related allowance recorded	1,421	1,930	1,645
With an related allowance recorded	990	694	871
Total	2,411	2,624	2,516
Interest Income Recognized
With no related allowance recorded	5	29	45
With an related allowance recorded	30	36	46
Total	35	65	91
Construction, 1 to 4 family residential [Member]
Recorded Investment
With no related allowance recorded	238	89	1,270
With a related allowance recorded	449	343	0
Total	687	432	1,270
Unpaid Principal Balance
With no related allowance recorded	238	89	2,974
With a related allowance recorded	461	354	0
Total	699	443	2,974
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	9	28	0
Total	9	28	0
Average Recorded Investment
With no related allowance recorded	173	44	1,727
With an related allowance recorded	449	348	0
Total	622	392	1,727
Interest Income Recognized
With no related allowance recorded	5	1	4
With an related allowance recorded	12	19	0
Total	17	20	4
Construction, land development and commercial [Member]
Recorded Investment
With no related allowance recorded	210	128	140
With a related allowance recorded	57	0	0
Total	267	128	140
Unpaid Principal Balance
With no related allowance recorded	314	220	140
With a related allowance recorded	58	0	0
Total	372	220	140
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	13	0	0
Total	13	0	0
Average Recorded Investment
With no related allowance recorded	231	142	229
With an related allowance recorded	58	0	0
Total	289	142	229
Interest Income Recognized
With no related allowance recorded	6	0	0
With an related allowance recorded	0	0	0
Total	6	0	0
Mortgage, farmland [Member]
Recorded Investment
With no related allowance recorded	2,233	2,040	0
With a related allowance recorded	0	278	284
Total	2,233	2,318	284
Unpaid Principal Balance
With no related allowance recorded	2,351	2,040	0
With a related allowance recorded	0	278	284
Total	2,351	2,318	284
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	0	12	14
Total	0	12	14
Average Recorded Investment
With no related allowance recorded	2,305	1,897	0
With an related allowance recorded	0	281	289
Total	2,305	2,178	289
Interest Income Recognized
With no related allowance recorded	110	90	0
With an related allowance recorded	0	14	14
Total	110	104	14
Mortgage, 1 to 4 family first liens [Member]
Recorded Investment
With no related allowance recorded	3,558	2,951	2,597
With a related allowance recorded	2,062	506	1,768
Total	5,620	3,457	4,365
Unpaid Principal Balance
With no related allowance recorded	4,419	3,705	3,542
With a related allowance recorded	2,156	596	1,897
Total	6,575	4,301	5,439
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	306	52	66
Total	306	52	66
Average Recorded Investment
With no related allowance recorded	3,806	2,980	2,691
With an related allowance recorded	2,133	526	1,821
Total	5,939	3,506	4,512
Interest Income Recognized
With no related allowance recorded	48	47	24
With an related allowance recorded	36	22	79
Total	84	69	103
Mortgage, 1 to 4 family junior liens [Member]
Recorded Investment
With no related allowance recorded	189	369	177
With a related allowance recorded	117	0	0
Total	306	369	177
Unpaid Principal Balance
With no related allowance recorded	500	673	451
With a related allowance recorded	270	0	0
Total	770	673	451
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	20	0	0
Total	20	0	0
Average Recorded Investment
With no related allowance recorded	204	386	198
With an related allowance recorded	179	0	0
Total	383	386	198
Interest Income Recognized
With no related allowance recorded	0	0	0
With an related allowance recorded	1	0	0
Total	1	0	0
Mortgage, multi-family [Member]
Recorded Investment
With no related allowance recorded	157	5,525	456
With a related allowance recorded	292	0	5,608
Total	449	5,525	6,064
Unpaid Principal Balance
With no related allowance recorded	226	5,632	1,068
With a related allowance recorded	332	0	5,608
Total	558	5,632	6,676
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	58	0	188
Total	58	0	188
Average Recorded Investment
With no related allowance recorded	175	5,598	666
With an related allowance recorded	316	0	5,673
Total	491	5,598	6,339
Interest Income Recognized
With no related allowance recorded	0	249	0
With an related allowance recorded	0	0	255
Total	0	249	255
Real Estate: Mortgage, commercial [Member]
Recorded Investment
With no related allowance recorded	1,831	3,290	2,494
With a related allowance recorded	948	697	9,205
Total	2,779	3,987	11,699
Unpaid Principal Balance
With no related allowance recorded	3,018	4,588	5,303
With a related allowance recorded	1,030	697	9,205
Total	4,048	5,285	14,508
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	52	9	17
Total	52	9	17
Average Recorded Investment
With no related allowance recorded	1,839	3,534	2,793
With an related allowance recorded	974	706	9,300
Total	2,813	4,240	12,093
Interest Income Recognized
With no related allowance recorded	50	53	46
With an related allowance recorded	38	37	535
Total	88	90	581
Loans to individuals [Member]
Recorded Investment
With no related allowance recorded	0	0	0
With a related allowance recorded	100	0	0
Total	100	0	0
Unpaid Principal Balance
With no related allowance recorded	20	20	20
With a related allowance recorded	100	0	0
Total	120	20	20
Related Allowance
With no related allowance recorded	0	0	0
With an related allowance recorded	100	0	0
Total	100	0	0
Average Recorded Investment
With no related allowance recorded	0	0	0
With an related allowance recorded	67	0	0
Total	67	0	0
Interest Income Recognized
With no related allowance recorded	0	0	0
With an related allowance recorded	4	0	0
Total	$ 4	$ 0	$ 0

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Gross	$ 71,723	$ 64,535
Less accumulated depreciation	38,201	35,464
Net	33,522	29,071
Land [Member]
Property, Plant and Equipment [Line Items]
Gross	8,996	7,835
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Gross	33,178	29,402
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Gross	$ 29,549	$ 27,298

Interest-Bearing Deposits - Sum

Interest-Bearing Deposits - Summary of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Interest-bearing Deposit Liabilities [Abstract]
NOW and other demand	$ 477,241	$ 450,486
Savings	644,115	588,781
Time, $100,000 and over	157,331	177,795
Other time	297,047	329,289
Total deposits	$ 1,575,734	$ 1,546,351

Interest-Bearing Deposits (Narr

Interest-Bearing Deposits (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Interest-bearing Deposit Liabilities [Abstract]
Total brokered deposits	$ 62,740	$ 64,490
Average interest rate of brokered deposits	0.42%	0.39%
Brokered deposits included in savings deposits	$ 54,010	$ 55,480
Brokered deposits included in time deposits	8,730	9,010
Brokered time-deposits 100000 or more	$ 6,970	$ 7,250

Interest-Bearing Deposits - Tim

Interest-Bearing Deposits - Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Interest-bearing Deposit Liabilities [Abstract]
Due in one year or less	$ 195,369	$ 243,316
Due after one year through two years	113,438	128,927
Due after two years through three years	73,845	74,493
Due after three years through four years	21,821	43,490
Due over four years	49,905	16,858
Time Deposits	$ 454,378	$ 507,084

Other Borrowings (Details)

Other Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Short-term Debt	$ 44,051	$ 47,499
Weighted average interest rate of short-term debt (in hundredths)	0.25%	0.26%
Securities sold under agreements to repurchase	$ 44,050
Weighted average interest rate on securities sold under agreements to repurchase (in hundredths)	0.26%
Amortized cost of collateralized investment securities	$ 59,510
Federal Funds Purchased, Secured by Other Securities [Member]
Short-term Debt [Line Items]
Short-term Debt	0	$ 6,945
Repurchase agreements with customers, renewable daily, interest payable monthly, secured by other securities (FHLB, FHLMC, FNMA) [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 44,051	$ 40,554

Federal Home Loan Bank Borrow65

Federal Home Loan Bank Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 225,000	$ 140,000
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal Home Loan Bank, Advances, floating rate, under one year	$ 0	15,000
Effective interest rates	0.28%
Federal Home Loan Bank Advances [Member] | Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	4.46%
Federal Home Loan Bank Advances [Member] | Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	4.66%
Federal Home Loan Bank Borrowings Due year two [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 30,000	45,000
Federal Home Loan Bank Borrowings Due year two [Member] | Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	4.09%
Federal Home Loan Bank Borrowings Due year two [Member] | Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	4.89%
Federal Home Loan Bank Borrowings Due year three [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 60,000	60,000
Effective interest rates	3.65%
Federal Home Loan Bank Borrowings Due year four [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 20,000	20,000
Federal Home Loan Bank Borrowings Due year five [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 25,000	0
Effective interest rates	3.05%
Federal Home Loan Bank Borrowings Due thereafter [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank borrowings	$ 90,000	$ 0
Federal Home Loan Bank Borrowings Due thereafter [Member] | Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	2.54%
Federal Home Loan Bank Borrowings Due thereafter [Member] | Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Effective interest rates	3.07%

Federal Home Loan Bank Borrow66

Federal Home Loan Bank Borrowings (Narrative) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Federal Home Loan Bank, Advances [Line Items]
Federal home loan bank stock	$ 11,834,000	$ 8,248,000
Loans receivable 1 to 4 family mortgage loans Pledged As Collateral	303,750,000	189,000,000
Loans receivable commercial real estate and multi family mortgage loans pledged as collateral	184,590,000	185,280,000
Loan borrowed against collateral	0	0
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
Amount of overnight borrowing	$ 0	$ 15,000,000

Accumulated Other Comprehensi67

Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect	$ 741	$ 276
Net-of-tax amount	(1,195)	(448)
Net unrealized gain on available-for-sale securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	2,244	2,072
Net unrealized (loss) gain on derivatives used for cash flow hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), before Tax	$ (4,180)	$ (2,796)

Accumulated Other Comprehensi68

Accumulated Other Comprehensive Income - Reclassification from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other noninterest income									$ 2,612	$ 2,496	$ 2,487
Tax (expense) benefit	$ (2,497)	$ (3,537)	$ (3,383)	$ (3,052)	$ (1,927)	$ (3,625)	$ (3,188)	$ (2,389)	(12,469)	(11,129)	(10,912)
Net income	$ 5,883	$ 7,685	$ 7,470	$ 7,380	$ 5,150	$ 7,899	$ 7,181	$ 6,744	28,418	26,974	25,931
Net unrealized gain on available-for-sale securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other noninterest income									0	0	17
Tax (expense) benefit									0	0	(7)
Net income									$ 0	$ 0	$ 10

Employee Benefit Plans (Narrati

Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percentage of employee cash contributions to ESPP, Minimum	1.00%
Percentage of employee cash contributions to ESPP, Maximum	15.00%
Maximum contribution to ESPP per offering period	$ 10,000
Employee Stock Purchase Plan (ESPP) number of shares purchased	4,155	4,184
Cash contributions to ESOP	$ 1,720,000	$ 1,610,000	$ 1,570,000
Percentage of cash contributions to ESOP	9.00%	9.00%	9.00%
Employee stock ownership plan (ESOP), number of shares contributed to ESOP				80,056
Percentage of floor rate payable on notes payable under ESOP				5.00%
Employee Stock Ownership Plan (ESOP), interest payable expected term				5 years
Employee Stock Ownership Plan (ESOP), shares issued	15,256	16,004	16,720
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 170,000	$ 130,000	$ 90,000
Employee Stock Ownership Plan (ESOP), unallocated ESOP	0	15,256	31,260
Matching contribution under 401(k) plan	$ 160,000	$ 160,000	$ 150,000
Maximum number of options and shares granted	188,000
Award expiration period	10 years
Directors' and officers' rights under the plan vesting period	5 years
Intrinsic Value, option exercised	$ 0	$ 100,000	$ 180,000
Period of interest rate swap used to calculate expected life of options	10 years
Stock option outstanding weighted-average exercise price (in dollars per share)	$ 29.92
Stock options outstanding, weighted average remaining contractual life	4 years 10 days
Share based compensation unrecognized compensation expense	$ 40,000
Share based compensation expected weighted average period	1 year 5 months 12 days
Number of exercisable stock options	9,160
Stock options exercisable, weighted average exercise price (in dollars per share)	$ 26
Stock options exercisable, weighted-average remaining contractual life	1 year 4 months
Number of shares available for stock options	104,740
Restricted common stock shares subject to forfeiture upon termination	10,800	10,800
Number of years of employment subject to forfeiture	8 years	8 years
Restricted Stock [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Directors' and officers' rights under the plan vesting period	5 years
Number of restricted shares authorized	18,314	19,144	7,168
Expense relating to awards	$ 390,000	$ 260,000	$ 210,000
Director [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation liability recorded in other liabilities	2,440,000	2,260,000
Deferred compensation expenses included in other noninterest expense	$ 210,000	230,000	170,000
Director [Member] | Maximum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Director contribution	50.00%
Executive Officer [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation liability recorded in other liabilities	$ 5,370,000	5,040,000
Deferred compensation expenses included in salaries and employee benefits expense	$ 490,000	$ 540,000	$ 390,000
Executive Officer [Member] | Maximum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percentage of deferment of base compensation	30.00%
Percentage of deferment of bonus	100.00%

Employee Benefit Plans - Shares

Employee Benefit Plans - Shares Held by ESOP (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 170,000	$ 130,000	$ 90,000
Shares held by the ESOP	844,088	838,088
Fair value per share	$ 44.50	$ 41.25
Maximum cash obligation	$ 37,562,000	$ 34,571,000

Employee Benefit Plans - Summar

Employee Benefit Plans - Summary of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Number of Shares
Options Outstanding Beginning Balance	19,380	25,260	35,970
Granted	0	0	0
Exercised	0	(5,880)	(10,710)
Options Outstanding Ending Balance	19,380	19,380	25,260	35,970
Weighted- Average Exercise Price
Options Outstanding Weighted Average Exercise Price Beginning Balance (in dollars per share)	$ 29.92	$ 26.98	$ 23.81
Options Outstanding Weighted Average Exercise Price Ending Balance (in dollars per share)	$ 29.92	$ 29.92	$ 26.98	$ 23.81
Weighted-Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term	4 years 11 days	5 years 11 days	4 years 8 months 19 days	4 years 3 months
Aggregate Intrinsic Value (In Thousands)
Aggregate Intrinsic Value	$ 580	$ 580	$ 681	$ 856

Employee Benefit Plans - Other

Employee Benefit Plans - Other Pertinent Information Related to Options (Details)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Defined Benefit Plan Disclosure [Line Items]
Stock option outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 29.92
Number Outstanding (in shares)	19,380
Remaining Contractual Life	4 years 10 days
Number of exercisable stock options	9,160
Exercise Price 52.00 [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock option outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 26
Number Outstanding (in shares)	9,160
Remaining Contractual Life	16 months
Number of exercisable stock options	9,160
Exercise Price 66.00 [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock option outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 33
Number Outstanding (in shares)	7,220
Remaining Contractual Life	76 months
Number of exercisable stock options	0
Exercise Price 69.00 [Member]
Defined Benefit Plan Disclosure [Line Items]
Stock option outstanding weighted-average exercise price (in dollars per share) | $ / shares	$ 34.50
Number Outstanding (in shares)	3,000
Remaining Contractual Life	82 months
Number of exercisable stock options	0

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal									$ 11,559	$ 9,412	$ 9,120
State									2,202	1,788	1,789
Deferred:
Federal									(1,114)	(27)	(78)
State									(178)	(44)	81
Total	$ 2,497	$ 3,537	$ 3,383	$ 3,052	$ 1,927	$ 3,625	$ 3,188	$ 2,389	$ 12,469	$ 11,129	$ 10,912

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax assets:
Allowance for loan losses	$ 10,140	$ 9,188
Deferred compensation	2,909	2,718
Unrealized losses on interest rate swaps	1,599	1,069
Accrued expenses	1,140	1,099
State net operating loss	708	600
Gross deferred tax assets	16,496	14,674
Valuation allowance	(708)	(600)
Deferred tax asset, net of valuation allowance	15,788	14,074
Deferred income tax liabilities:
Property and equipment	1,910	1,878
Unrealized gains on investment securities	858	793
Goodwill	624	624
Other	701	841
Gross deferred tax liabilities	4,093	4,136
Net deferred tax assets	$ 11,695	$ 9,938

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Valuation allowance increase	$ 108,000	$ 111,000
Income Tax Examination, Penalties and Interest Expense	$ 0	$ 0
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Income tax year, under examination	December 31, 2015, 2014, 2013 and 2012
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Income tax year, under examination	December 31, 2015, 2014, 2013 and 2012

Income Taxes - Summary of Chang

Income Taxes - Summary of Change in Deferred Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Consolidated statements of income	$ 1,292	$ 71	$ (3)
Consolidated statements of stockholders' equity	465	1,262	1,464
Net change in deferred income tax	$ 1,757	$ 1,333	$ 1,461

Income Taxes - Effective Income

Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income Tax Examination, Penalties and Interest Expense									$ 0	$ 0
Reconciliation of effective income tax rate with federal statutory tax rate
Expected tax expense, Amount									$ 14,310,000	$ 13,336,000	$ 12,895,000
Expected tax expense, Percent Of Pretax Income									35.00%	35.00%	35.00%
Tax-exempt interest, Amount									$ (1,776,000)	$ (1,788,000)	$ (1,690,000)
Tax-exempt interest, Percent Of Pretax Income									(4.30%)	(4.70%)	(4.60%)
Interest expense limitation, Amount									$ 97,000	$ 96,000	$ 99,000
Interest expenses limitation, Percent Of Pretax Income									0.20%	0.30%	0.30%
State income taxes, net of federal income tax benefit, Amount									$ 1,316,000	$ 1,134,000	$ 1,216,000
State income taxes, net of federal income tax benefit, Percent Of Pretax Income									3.20%	3.00%	3.30%
Income tax credits, Amount									$ (1,426,000)	$ (1,546,000)	$ (1,992,000)
Income tax credits, Percent Of Pretax Income									(3.50%)	(4.10%)	(5.40%)
Other, Amount									$ (52,000)	$ (103,000)	$ 384,000
Other, Percent Of Pretax Income									(0.10%)	(0.30%)	1.00%
Total	$ 2,497,000	$ 3,537,000	$ 3,383,000	$ 3,052,000	$ 1,927,000	$ 3,625,000	$ 3,188,000	$ 2,389,000	$ 12,469,000	$ 11,129,000	$ 10,912,000
Total, Percent Of Pretax Income									30.50%	29.20%	29.60%

Regulatory Capital Requiremen78

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Parent Company [Member]
Minimum regulatory requirements [Abstract]
Total risk-based capital, Actual Amount	$ 334,899	$ 310,622
Total risk-based capital, Actual Ratio	15.82%	17.21%
Total risk-based capital, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 risk-based capital, Actual Amount	$ 308,432	$ 288,047
Tier 1 risk-based capital, Actual Ratio	14.57%	15.96%
Tier 1 risk-based capital, For Capital Adequacy Purposes, Ratio	6.00%	4.00%
Tier 1 risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	6.00%
Tier one common equity capital, Actual Amount	$ 308,432
Tier one common equity capital to risk weighted assets	14.57%
Tier One Minimum Capital Requirement to Common Equity	4.50%
Tier One Common Equity Capital to be Well Capitalized	6.50%
Leverage ratio, Actual Amount	$ 308,432	$ 288,047
Leverage ratio, Actual Ratio	12.53%	12.54%
Leverage ratio, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Leverage ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Bank [Member]
Minimum regulatory requirements [Abstract]
Total risk-based capital, Actual Amount	$ 335,010	$ 310,066
Total risk-based capital, Actual Ratio	15.83%	17.19%
Total risk-based capital, For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 risk-based capital, Actual Amount	$ 308,562	$ 287,504
Tier 1 risk-based capital, Actual Ratio	14.58%	15.94%
Tier 1 risk-based capital, For Capital Adequacy Purposes, Ratio	6.00%	5.00%
Tier 1 risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	6.00%
Tier one common equity capital, Actual Amount	$ 308,562
Tier one common equity capital to risk weighted assets	14.58%
Tier One Minimum Capital Requirement to Common Equity	4.50%
Tier One Common Equity Capital to be Well Capitalized	6.50%
Leverage ratio, Actual Amount	$ 308,562	$ 287,504
Leverage ratio, Actual Ratio	12.54%	12.51%
Leverage ratio, For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Leverage ratio, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%

Regulatory Capital Requiremen79

Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Regulatory Capital Requirements, Restrictions on Subsidiary Dividends and Cash Restrictions [Abstract]
Retained Earnings, available for payment of dividends	$ 131,300
Cash reserve balances	$ 12,640	$ 540

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Changes in loans to related parties [Roll Forward]
Balance, beginning	$ 19,246	$ 19,717
Net increase due to change in related parties	0	0
Advances	24,523	11,760
Collections	(16,765)	(12,231)
Balance, ending	27,004	19,246
Related Party Deposits	$ 6,920	$ 6,210

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Value and Estimated Fair Values (Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014
Readily Available Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents		$ 35,427	[1]	$ 29,174	[2]
Investment securities		0	[1]	0	[2]
Loans held for sale		0	[1]	0	[2]
Loans
Agricultural		0	[1]	0	[2]
Commercial and financial		0	[1]	0	[2]
Real estate:
Construction, 1 to 4 family residential		0	[1]	0	[2]
Construction, land development and commercial		0	[1]	0	[2]
Mortgage, farmland		0	[1]	0	[2]
Mortgage, 1 to 4 family first liens		0	[1]	0	[2]
Mortgage, 1 to 4 family junior liens		0	[1]	0	[2]
Mortgage, multi-family		0	[1]	0	[2]
Mortgage, commercial		0	[1]	0	[2]
Loans to individuals		0	[1]	0	[2]
Obligations of state and political subdivisions		0	[1]	0	[2]
Accrued interest receivable		0	[1]	0	[2]
Total financial instrument assets		35,427	[1]	29,174	[2]
Deposits
Noninterest-bearing deposits		0	[1]	0	[2]
Deposits Interest Bearing Fair Value Disclosure		0	[1]	0	[2]
Short-term Debt, Fair Value		0	[1]	0	[2]
Federal Home Loan Bank borrowings		0	[1]	0	[2]
Interest rate swaps	[1]	0		0
Accrued interest payable		0	[1]	0	[2]
Total financial instrument liabilities		0	[1]	0	[2]
Financial instrument with off-balance sheet risk:
Loan commitments		0	[1]	0	[2]
Letters of credit		0	[1]	0	[2]
Total financial instrument liabilities with off-balance-sheet risk		0	[1]	0	[2]
Observable Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents		0	[3]	0	[4]
Investment securities		276,069	[3]	267,240	[4]
Loans held for sale		5,554	[3]	4,476	[4]
Loans
Agricultural		0	[3]	0	[4]
Commercial and financial		0	[3]	0	[4]
Real estate:
Construction, 1 to 4 family residential		0	[3]	0	[4]
Construction, land development and commercial		0	[3]	0	[4]
Mortgage, farmland		0	[3]	0	[4]
Mortgage, 1 to 4 family first liens		0	[3]	0	[4]
Mortgage, 1 to 4 family junior liens		0	[3]	0	[4]
Mortgage, multi-family		0	[3]	0	[4]
Mortgage, commercial		0	[3]	0	[4]
Loans to individuals		0	[3]	0	[4]
Obligations of state and political subdivisions		0	[3]	0	[4]
Accrued interest receivable		8,672	[3]	8,276	[4]
Total financial instrument assets		290,295	[3]	279,992	[4]
Deposits
Noninterest-bearing deposits		314,968	[3]	288,718	[4]
Deposits Interest Bearing Fair Value Disclosure		1,577,684	[3]	1,550,974	[4]
Short-term Debt, Fair Value		44,051	[3]	47,499	[4]
Federal Home Loan Bank borrowings		226,157	[3]	145,210	[4]
Interest rate swaps	[3]	4,180		2,796
Accrued interest payable		846	[3]	902	[4]
Total financial instrument liabilities		2,167,886	[3]	2,036,099	[4]
Financial instrument with off-balance sheet risk:
Loan commitments		0	[3]	0	[4]
Letters of credit		0	[3]	0	[4]
Total financial instrument liabilities with off-balance-sheet risk		0	[3]	0	[4]
Company Determined Market Prices [Member]
Financial instrument assets:
Cash and cash equivalents		0	[5]	0	[6]
Investment securities		0	[5]	0	[6]
Loans held for sale		0	[5]	0	[6]
Loans
Agricultural		98,530	[5]	95,126	[6]
Commercial and financial		179,649	[5]	171,081	[6]
Real estate:
Construction, 1 to 4 family residential		50,487	[5]	45,159	[6]
Construction, land development and commercial		81,705	[5]	75,623	[6]
Mortgage, farmland		184,640	[5]	159,623	[6]
Mortgage, 1 to 4 family first liens		718,566	[5]	665,428	[6]
Mortgage, 1 to 4 family junior liens		122,173	[5]	115,726	[6]
Mortgage, multi-family		272,446	[5]	246,191	[6]
Mortgage, commercial		319,090	[5]	318,211	[6]
Loans to individuals		23,509	[5]	21,016	[6]
Obligations of state and political subdivisions		51,073	[5]	54,800	[6]
Accrued interest receivable		0	[5]	0	[6]
Total financial instrument assets		2,101,868	[5]	1,967,984	[6]
Deposits
Noninterest-bearing deposits		0	[5]	0	[6]
Deposits Interest Bearing Fair Value Disclosure		0	[5]	0	[6]
Short-term Debt, Fair Value		0	[5]	0	[6]
Federal Home Loan Bank borrowings		0	[5]	0	[6]
Interest rate swaps	[5]	0		0
Accrued interest payable		0	[5]	0	[6]
Total financial instrument liabilities		0	[5]	0	[6]
Financial instrument with off-balance sheet risk:
Loan commitments		0	[5]	0	[6]
Letters of credit		0	[5]	0	[6]
Total financial instrument liabilities with off-balance-sheet risk		0	[5]	0	[6]
Carrying Amount [Member]
Financial instrument assets:
Cash and cash equivalents		35,427		29,174
Investment securities		276,069		267,240
Loans held for sale		5,554		4,476
Loans
Agricultural		98,506		95,130
Commercial and financial		179,682		170,507
Real estate:
Construction, 1 to 4 family residential		50,480		45,139
Construction, land development and commercial		81,707		75,589
Mortgage, farmland		184,514		159,831
Mortgage, 1 to 4 family first liens		720,229		666,406
Mortgage, 1 to 4 family junior liens		116,632		109,133
Mortgage, multi-family		270,261		243,723
Mortgage, commercial		320,899		318,896
Loans to individuals		23,518		21,043
Obligations of state and political subdivisions		51,978		55,281
Accrued interest receivable		8,672		8,276
Total financial instrument assets		2,424,128		2,269,844
Deposits
Noninterest-bearing deposits		314,968		288,718
Deposits Interest Bearing Fair Value Disclosure		1,575,734		1,546,351
Short-term Debt, Fair Value		44,051		47,499
Federal Home Loan Bank borrowings		225,000		140,000
Interest rate swaps		4,180		2,796
Accrued interest payable		846		902
Total financial instrument liabilities		2,164,779		2,026,266
Financial instrument with off-balance sheet risk:
Loan commitments		344,602		334,100
Letters of credit		11,718		12,437
Total financial instrument liabilities with off-balance-sheet risk		356,320		346,537
Estimated Fair Value [Member]
Financial instrument assets:
Cash and cash equivalents		35,427		29,174
Investment securities		276,069		267,240
Loans held for sale		5,554		4,476
Loans
Agricultural		98,530		95,126
Commercial and financial		179,649		171,081
Real estate:
Construction, 1 to 4 family residential		50,487		45,159
Construction, land development and commercial		81,705		75,623
Mortgage, farmland		184,640		159,623
Mortgage, 1 to 4 family first liens		718,566		665,428
Mortgage, 1 to 4 family junior liens		122,173		115,726
Mortgage, multi-family		272,446		246,191
Mortgage, commercial		319,090		318,211
Loans to individuals		23,509		21,016
Obligations of state and political subdivisions		51,073		54,800
Accrued interest receivable		8,672		8,276
Total financial instrument assets		2,427,590		2,277,150
Deposits
Noninterest-bearing deposits		314,968		288,718
Deposits Interest Bearing Fair Value Disclosure		1,577,684		1,550,974
Short-term Debt, Fair Value		44,051		47,499
Federal Home Loan Bank borrowings		226,157		145,210
Interest rate swaps		4,180		2,796
Accrued interest payable		846		902
Total financial instrument liabilities		2,167,886		2,036,099
Financial instrument with off-balance sheet risk:
Loan commitments		0		0
Letters of credit		0		0
Total financial instrument liabilities with off-balance-sheet risk		$ 0		$ 0
[1]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[2]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[3]	Considered Level 2 under ASC 820.
[4]	Considered Level 2 under ASC 820.
[5]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
[6]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Recurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		$ 264,235	$ 258,992
US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		24,978	22,333
State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		173,929	168,968
Readily Available Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability	[1]	0	0
Observable Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability	[2]	(4,180)	(2,796)
Company Determined Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability	[3]	0	0
Recurring Basis [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total		260,055	256,196
Recurring Basis [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		24,978	22,333
Recurring Basis [Member] | State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		173,929	168,968
Recurring Basis [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value		65,328	67,691
Recurring Basis [Member] | Derivative Financial Instruments, Liabilities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability		(4,180)
Recurring Basis [Member] | Derivative Financial Instruments, Assets [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative asset			(2,796)
Recurring Basis [Member] | Readily Available Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	[4]	0	0
Recurring Basis [Member] | Readily Available Market Prices [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[4]	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]
Estimated Fair Value	[4]	0	0
Recurring Basis [Member] | Readily Available Market Prices [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[4]	0	0
Recurring Basis [Member] | Readily Available Market Prices [Member] | Derivative Financial Instruments, Assets [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative asset	[4]		0
Recurring Basis [Member] | Observable Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	[5]	260,055	256,196
Recurring Basis [Member] | Observable Market Prices [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[5]	24,978	22,333
Recurring Basis [Member] | Observable Market Prices [Member] | State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[5]	173,929	168,968
Recurring Basis [Member] | Observable Market Prices [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[5]	65,328	67,691
Recurring Basis [Member] | Observable Market Prices [Member] | Derivative Financial Instruments, Liabilities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative liability	[5]	(4,180)
Recurring Basis [Member] | Observable Market Prices [Member] | Derivative Financial Instruments, Assets [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative asset	[5]		(2,796)
Recurring Basis [Member] | Company Determined Market Prices [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Total	[6]	0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | US Treasury Securities [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[6]	0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | State and political subdivisions [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[6]	0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | Other securities (FHLB, FHLMC and FNMA) [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Estimated Fair Value	[6]	$ 0	0
Recurring Basis [Member] | Company Determined Market Prices [Member] | Derivative Financial Instruments, Assets [Member]
Summary of assets and liabilities measured at fair value on a recurring basis [Abstract]
Interest rate swaps, derivative asset	[6]		$ 0
[1]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[2]	Considered Level 2 under ASC 820.
[3]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
[4]	Considered Level 1 under ASC 820.
[5]	Considered Level 2 under ASC 820.
[6]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.

Fair Value Measurements - Ass83

Fair Value Measurements - Assets and Liabilities on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014
Readily Available Market Prices [Member]
Loans
Agricultural	$ 0	[1]	$ 0	[2]
Commercial and financial	0	[1]	0	[2]
Real Estate:
Construction, land development and commercial	0	[1]	0	[2]
Mortgage, farmland	0	[1]	0	[2]
Mortgage, 1 to 4 family first liens	0	[1]	0	[2]
Mortgage, 1 to 4 family junior liens	0	[1]	0	[2]
Mortgage, multi-family	0	[1]	0	[2]
Mortgage, commercial	0	[1]	0	[2]
Loans to individuals	0	[1]	0	[2]
Total financial instrument assets	35,427	[1]	29,174	[2]
Observable Market Prices [Member]
Loans
Agricultural	0	[3]	0	[4]
Commercial and financial	0	[3]	0	[4]
Real Estate:
Construction, land development and commercial	0	[3]	0	[4]
Mortgage, farmland	0	[3]	0	[4]
Mortgage, 1 to 4 family first liens	0	[3]	0	[4]
Mortgage, 1 to 4 family junior liens	0	[3]	0	[4]
Mortgage, multi-family	0	[3]	0	[4]
Mortgage, commercial	0	[3]	0	[4]
Loans to individuals	0	[3]	0	[4]
Total financial instrument assets	290,295	[3]	279,992	[4]
Company Determined Market Prices [Member]
Loans
Agricultural	98,530	[5]	95,126	[6]
Commercial and financial	179,649	[5]	171,081	[6]
Real Estate:
Construction, land development and commercial	81,705	[5]	75,623	[6]
Mortgage, farmland	184,640	[5]	159,623	[6]
Mortgage, 1 to 4 family first liens	718,566	[5]	665,428	[6]
Mortgage, 1 to 4 family junior liens	122,173	[5]	115,726	[6]
Mortgage, multi-family	272,446	[5]	246,191	[6]
Mortgage, commercial	319,090	[5]	318,211	[6]
Loans to individuals	23,509	[5]	21,016	[6]
Total financial instrument assets	2,101,868	[5]	1,967,984	[6]
Nonrecurring Basis [Member]
Loans
Agricultural	1,470	[7]	1,679	[8]
Commercial and financial	1,178	[7]	1,709	[8]
Real Estate:
Construction, 1 to 4 family residential	482	[7]	315	[8]
Construction, land development and commercial	132	[7]	0	[8]
Mortgage, farmland	2,233	[7]	2,040	[8]
Mortgage, 1 to 4 family first liens	4,487	[7]	2,500	[8]
Mortgage, 1 to 4 family junior liens	286	[7]	369	[8]
Mortgage, multi-family	391	[7]	5,525	[8]
Mortgage, commercial	1,152	[7]	1,918	[8]
Loans to individuals	0	[7]	0	[8]
Foreclosed assets	100	[9]	301	[10]
Total financial instrument assets	11,911	[7]	16,356	[8]
Total Losses	1,310	[7]	1,369	[8]
Nonrecurring Basis [Member] | Readily Available Market Prices [Member]
Loans
Agricultural	0	[7],[11]	0	[8],[12]
Commercial and financial	0	[7],[11]	0	[8],[12]
Real Estate:
Construction, 1 to 4 family residential	0	[7],[11]	0	[8],[12]
Construction, land development and commercial	0	[7],[11]	0	[8],[12]
Mortgage, farmland	0	[7],[11]	0	[8],[12]
Mortgage, 1 to 4 family first liens	0	[7],[11]	0	[8],[12]
Mortgage, 1 to 4 family junior liens	0	[7],[11]	0	[8],[12]
Mortgage, multi-family	0	[7],[11]	0	[8],[12]
Mortgage, commercial	0	[7],[11]	0	[8],[12]
Loans to individuals	0	[7],[11]	0	[8],[12]
Foreclosed assets	0	[9],[11]	0	[10],[12]
Total financial instrument assets	0	[11]	0	[12]
Nonrecurring Basis [Member] | Observable Market Prices [Member]
Loans
Agricultural	0	[7],[13]	0	[8],[14]
Commercial and financial	0	[7],[13]	0	[8],[14]
Real Estate:
Construction, 1 to 4 family residential	0	[7],[13]	0	[8],[14]
Construction, land development and commercial	0	[7],[13]	0	[8],[14]
Mortgage, farmland	0	[7],[13]	0	[8],[14]
Mortgage, 1 to 4 family first liens	0	[7],[13]	0	[8],[14]
Mortgage, 1 to 4 family junior liens	0	[7],[13]	0	[8],[14]
Mortgage, multi-family	0	[7],[13]	0	[8],[14]
Mortgage, commercial	0	[7],[13]	0	[8],[14]
Loans to individuals	0	[7],[13]	0	[8],[14]
Foreclosed assets	0	[9],[13]	0	[10],[14]
Total financial instrument assets	0	[13]	0	[14]
Nonrecurring Basis [Member] | Company Determined Market Prices [Member]
Loans
Agricultural	1,470	[7],[15]	1,679	[8],[16]
Commercial and financial	1,178	[7],[15]	1,709	[8],[16]
Real Estate:
Construction, 1 to 4 family residential	482	[7],[15]	315	[8],[16]
Construction, land development and commercial	132	[7],[15]	0	[8],[16]
Mortgage, farmland	2,233	[7],[15]	2,040	[8],[16]
Mortgage, 1 to 4 family first liens	4,487	[7],[15]	2,500	[8],[16]
Mortgage, 1 to 4 family junior liens	286	[7],[15]	369	[8],[16]
Mortgage, multi-family	391	[7],[15]	5,525	[8],[16]
Mortgage, commercial	1,152	[7],[15]	1,918	[8],[16]
Loans to individuals	0	[7],[15]	0	[8],[16]
Foreclosed assets	100	[9],[15]	301	[10],[16]
Total financial instrument assets	11,911	[15]	16,356	[16]
Agricultural [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	116	[7]	25	[8]
Commercial and financial [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	56	[7]	206	[8]
Construction, 1 to 4 family residential [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	161	[7]	0	[8]
Construction, land development and commercial [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	35	[7]	0	[8]
Mortgage, farmland [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	0	[8]
Mortgage, 1 to 4 family first liens [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	529	[7]	576	[8]
Mortgage, 1 to 4 family junior liens [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	166	[7]	24	[8]
Mortgage, multi-family [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	38	[7]	0	[8]
Real Estate: Mortgage, commercial [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	140	[7]	328	[8]
Loans to individuals [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	0	[7]	0	[8]
Foreclosed assets [Member] | Nonrecurring Basis [Member]
Real Estate:
Total Losses	$ 69	[9]	$ 210	[10]
[1]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[2]	Considered Level 1 under Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC 820”).
[3]	Considered Level 2 under ASC 820.
[4]	Considered Level 2 under ASC 820.
[5]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
[6]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market
[7]	Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero.
[8]	Represents carrying value and related write-downs of loans for which adjustments are based on the value of the collateral. The carrying value of loans fully charged off is zero.
[9]	Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.
[10]	Represents the fair value and related losses of foreclosed real estate and other collateral owned that were measured at fair value subsequent to their initial classification as foreclosed assets.
[11]	Considered Level 1 under ASC 820.
[12]	Considered Level 1 under ASC 820.
[13]	Considered Level 2 under ASC 820.
[14]	Considered Level 2 under ASC 820.
[15]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.
[16]	Considered Level 3 under ASC 820 and are based on valuation models that use significant assumptions that are not observable in an active market.

Parent Company Only Financial84

Parent Company Only Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents at subsidiary bank	$ 35,427	$ 29,174
Investment in subsidiary bank	264,235	258,992
Other assets	4,241	3,802
Total Assets	2,493,607	2,334,318
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities	2,183,870	2,044,219
Redeemable common stock held by ESOP	37,562	34,571
Stockholders' equity:
Capital stock	0	0
Retained earnings	294,487	271,924
Accumulated other comprehensive (loss) income	(1,195)	(448)
Treasury stock at cost	(27,252)	(23,798)
Total Stockholders' Equity	309,737	290,099
Less maximum cash obligation related to ESOP shares	37,562	34,571
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	272,175	255,528	$ 243,789	$ 225,196
Total Liabilities & Stockholders' Equity	2,493,607	2,334,318
Parent Company [Member]
ASSETS
Cash and cash equivalents at subsidiary bank	843	1,881	$ 3,018	$ 3,367
Investment in subsidiary bank	309,866	289,556
Other assets	1,553	1,527
Total Assets	312,262	292,964
LIABILITIES AND STOCKHOLDERS' EQUITY
Liabilities	2,525	2,361
Redeemable common stock held by ESOP	37,562	34,571
Stockholders' equity:
Capital stock	43,697	42,925
Retained earnings	294,487	271,924
Accumulated other comprehensive (loss) income	(1,195)	(448)
Treasury stock at cost	(27,252)	(23,798)
Total Stockholders' Equity	309,737	290,603
Less maximum cash obligation related to ESOP shares	37,562	34,571
Total Stockholders' Equity Less Maximum Cash Obligations Related To ESOP Shares	272,175	256,032
Total Liabilities & Stockholders' Equity	$ 312,262	$ 292,964

Parent Company Only Financial85

Parent Company Only Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Income before income taxes	$ 8,380	$ 11,222	$ 10,853	$ 10,432	$ 7,077	$ 11,524	$ 10,369	$ 9,133	$ 40,887	$ 38,103	$ 36,843
Income tax benefit	(2,497)	(3,537)	(3,383)	(3,052)	(1,927)	(3,625)	(3,188)	(2,389)	(12,469)	(11,129)	(10,912)
Net income	$ 5,883	$ 7,685	$ 7,470	$ 7,380	$ 5,150	$ 7,899	$ 7,181	$ 6,744	28,418	26,974	25,931
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends received from subsidiary									7,364	7,438	5,213
Other expenses									(713)	(637)	(471)
Income before income taxes									6,651	6,801	4,742
Income tax benefit									338	254	141
Total income after tax benefit									6,989	7,055	4,883
Equity in undistributed income of subsidiary									21,429	19,919	21,048
Net income									$ 28,418	$ 26,974	$ 25,931

Parent Company Only Financial86

Parent Company Only Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 5,883	$ 7,685	$ 7,470	$ 7,380	$ 5,150	$ 7,899	$ 7,181	$ 6,744	$ 28,418	$ 26,974	$ 25,931
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:
Share-based compensation									29	29	28
Compensation expensed through issuance of common stock									1,657	1,549	997
Excess tax benefits related to share-based compensation									(8)	(60)	(92)
Forfeiture of common stock									(37)	(40)	(35)
(Increase) decrease in other assets									(431)	(19)	2,438
Net cash and cash equivalents provided by operating activities									32,451	33,145	59,798
Cash Flows from Financing Activities
Stock options exercised									0	101	175
Excess tax benefits related to share-based compensation									8	60	93
Purchase of treasury stock									(3,454)	(4,014)	(1,387)
Dividends paid									(5,855)	(5,420)	(5,186)
Net cash and cash equivalents used by financing activities									127,884	136,402	44,261
Decrease in cash and cash equivalents									6,253	(14,528)	(19,880)
Cash and cash equivalents:
Beginning of year				29,174					29,174
Ending of year	35,427				29,174				35,427	29,174
Parent Company [Member]
Cash flows from operating activities:
Net income									28,418	26,974	25,931
Adjustments to reconcile net income to cash and cash equivalents provided by operating activities:
Equity in undistributed income of subsidiary									(21,429)	(19,919)	(21,048)
Share-based compensation									29	29	28
Compensation expensed through issuance of common stock									1,153	1,045	467
Excess tax benefits related to share-based compensation									(8)	(60)	(92)
Forfeiture of common stock									(37)	(40)	(35)
(Increase) decrease in other assets									(27)	(63)	647
Increase in other liabilities									164	170	59
Net cash and cash equivalents provided by operating activities									8,263	8,136	5,957
Cash Flows from Financing Activities
Stock options exercised									0	101	175
Excess tax benefits related to share-based compensation									8	60	92
Purchase of treasury stock									(3,454)	(4,014)	(1,387)
Dividends paid									(5,855)	(5,420)	(5,186)
Net cash and cash equivalents used by financing activities									(9,301)	(9,273)	(6,306)
Decrease in cash and cash equivalents									(1,038)	(1,137)	(349)
Cash and cash equivalents:
Beginning of year				$ 1,881				$ 3,018	1,881	3,018	3,367
Ending of year	$ 843				$ 1,881				$ 843	$ 1,881	$ 3,018

Commitments and Contingencies87

Commitments and Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Cost-method Investments [Line Items]
Liabilities for potential obligations from standby letters of credit issued	$ 0	$ 0
Rent expense	350,000	$ 320,000	$ 330,000
State and political subdivisions [Member]
Schedule of Cost-method Investments [Line Items]
Investment in securities issued by state and political subdivisions within the state of Iowa	$ 91,170,000

Commitments and Contingencies -

Commitments and Contingencies - Summary of Bank's Commitments (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Off-balance sheet liability [Line Items]
Liabilities for potential obligations from standby letters of credit issued	$ 0	$ 0
Home equity loans [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	44,376,000	40,484,000
Credit cards [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	41,518,000	46,573,000
Commercial, real estate and home construction [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	98,613,000	81,613,000
Commercial lines and real estate purchase loans [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	160,095,000	165,430,000
Outstanding letters of credit [Member]
Firm loan commitments and unused portion of lines of credit:
Total financial instrument liabilities with off-balance-sheet risk	$ 11,718,000	$ 12,437,000

Commitments and Contingencies89

Commitments and Contingencies - Minimum Future Rental Commitments (Details) $ in Thousands	Dec. 31, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,015	$ 448
2,016	317
2,017	287
2,018	75
2,019	1
Thereafter	0
Total	$ 1,128

Quarterly Results of Operatio90

Quarterly Results of Operations (unaudited, amounts in thousands, except per share amounts) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 23,631	$ 23,295	$ 23,027	$ 22,214	$ 22,450	$ 21,794	$ 21,473	$ 20,865	$ 92,167	$ 86,582	$ 84,895
Net interest income	3,959	3,714	3,659	3,635	3,723	3,704	3,760	3,850	14,967	15,037	16,848
Net interest income	19,672	19,581	19,368	18,579	18,727	18,090	17,713	17,015	77,200	71,545	68,047
Provision for loan losses	1,295	(95)	517	(62)	2,251	(1,008)	(246)	45	1,655	1,042	1,131
Other income	5,088	5,218	5,506	4,990	4,741	5,247	4,947	4,421	20,802	19,356	19,205
Other expense	15,085	13,672	13,504	13,199	14,140	12,821	12,537	12,258	55,460	51,756	49,278
Income before income taxes	8,380	11,222	10,853	10,432	7,077	11,524	10,369	9,133	40,887	38,103	36,843
Income taxes	2,497	3,537	3,383	3,052	1,927	3,625	3,188	2,389	12,469	11,129	10,912
Net income	$ 5,883	$ 7,685	$ 7,470	$ 7,380	$ 5,150	$ 7,899	$ 7,181	$ 6,744	$ 28,418	$ 26,974	$ 25,931
Basic earnings per share	$ 0.63	$ 0.82	$ 0.80	$ 0.79	$ 0.55	$ 0.85	$ 0.76	$ 0.72	$ 3.04	$ 2.88	$ 2.76
Diluted earnings per share	$ 0.63	$ 0.82	$ 0.80	$ 0.79	$ 0.55	$ 0.84	$ 0.76	$ 0.72	$ 3.04	$ 2.87	$ 2.75

Derivative Financial Instrume91

Derivative Financial Instruments (Narrative) (Details)	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Nov. 07, 2013USD ($)derivative
Derivatives, Fair Value [Line Items]
Collateral required by the bank	$ 4,180,000
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Number of interest rate swaps held | derivative			2
Description of terms	three-month LIBOR
Interest Rate Swap 1 [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			$ 25,000,000
Interest Rate Swap 1 [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Maturity date	Nov. 9, 2020
Notional Amount		$ 25,000,000
Interest Rate Swap 1 [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 25,000,000
Interest Rate Swap 2 [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			$ 25,000,000
Interest Rate Swap 2 [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Maturity date	Nov. 7, 2023
Notional Amount		$ 25,000,000
Interest Rate Swap 2 [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 25,000,000

Derivative Financial Instrume92

Derivative Financial Instruments - Balance Sheet Category and Fair Value for Cash Flow Hedges (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Nov. 07, 2013
Interest Rate Swap 1 [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			$ 25,000,000
Interest Rate Swap 1 [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 25,000,000
Fair Value	(1,501,000)
Interest Rate Swap 1 [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		$ 25,000,000
Fair Value		(864,000)
Interest Rate Swap 2 [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			$ 25,000,000
Interest Rate Swap 2 [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	25,000,000
Fair Value	$ (2,679,000)
Interest Rate Swap 2 [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		25,000,000
Fair Value		$ (1,932,000)

Derivative Financial Instrume93

Derivative Financial Instruments (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Interest Rate Swap 1 [Member] | Interest Expense [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Amount of Gain (Loss), Recognized in OCI, Effective Portion	$ (394)	$ (754)
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 2 [Member] | Interest Expense [Member]
Gain (Loss) Recognized in Other Comprehensive Income, Net [Abstract]
Amount of Gain (Loss), Recognized in OCI, Effective Portion	(461)	(1,448)
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