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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment $ 190 $ 263    
Collectively evaluated for impairment 14,130 13,975    
Total 14,433 14,361 $ 14,315 $ 14,268
Individually evaluated for impairment 9,419 7,354    
Collectively evaluated for impairment 996,060 993,910    
Total 1,005,803 1,001,527    
Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans acquired with credit deterioration 113 123    
Loan balance of loans acquired with credit deterioration 324 263    
Commercial and Agriculture [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment   23    
Collectively evaluated for impairment 1,446 1,455    
Total 1,446 1,478 1,795 1,819
Individually evaluated for impairment 2,521 873    
Collectively evaluated for impairment 119,555 123,397    
Total 122,207 124,402    
Commercial and Agriculture [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loan balance of loans acquired with credit deterioration 131 132    
Commercial Real Estate Owner Occupied [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 4 103    
Collectively evaluated for impairment 2,368 2,364    
Total 2,372 2,467 1,808 2,221
Individually evaluated for impairment 1,650 2,141    
Collectively evaluated for impairment 165,209 165,756    
Total 166,859 167,897    
Commercial Real Estate Non Owner Occupied [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 23      
Collectively evaluated for impairment 4,688 4,657    
Total 4,711 4,657 4,926 4,334
Individually evaluated for impairment 1,982 1,742    
Collectively evaluated for impairment 342,735 346,697    
Total 344,717 348,439    
Residential Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Individually evaluated for impairment 163 137    
Collectively evaluated for impairment 3,838 3,826    
Total 4,114 4,086 3,666 3,747
Individually evaluated for impairment 1,865 1,642    
Collectively evaluated for impairment 241,777 234,565    
Total 243,835 236,338    
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans acquired with credit deterioration 113 123    
Loan balance of loans acquired with credit deterioration 193 131    
Real Estate Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 408 371    
Total 408 371 498 428
Collectively evaluated for impairment 64,176 58,898    
Total 64,176 58,898    
Farm Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 496 538    
Total 496 538 799 822
Individually evaluated for impairment 1,398 953    
Collectively evaluated for impairment 43,562 46,040    
Total 44,960 46,993    
Consumer and Other [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 358 382    
Total 358 382 190 200
Individually evaluated for impairment 3 3    
Collectively evaluated for impairment 19,046 18,557    
Total 19,049 18,560    
Unallocated [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment 528 382    
Total $ 528 $ 382 $ 633 $ 697