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Allowance for Loan Losses - Ending Allocation of Allowance for Loan Losses and Loan Balances Outstanding (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment $ 189   $ 263      
Collectively evaluated for impairment 14,253   13,975      
Total 14,547 $ 14,433 14,361 $ 14,707 $ 14,315 $ 14,268
Individually evaluated for impairment 8,061   7,354      
Collectively evaluated for impairment 1,020,561   993,910      
Total 1,028,922   1,001,527      
Receivables Acquired with Deteriorated Credit Quality [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans acquired with credit deterioration 105   123      
Loan balance of loans acquired with credit deterioration 300   263      
Commercial and Agriculture [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment     23      
Collectively evaluated for impairment 1,557   1,455      
Total 1,557 1,446 1,478 1,395 1,795 1,819
Individually evaluated for impairment 2,417   873      
Collectively evaluated for impairment 124,013   123,397      
Total 126,540   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 110   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 2,389   2,364      
Total 2,393 2,372 2,467 5,073 1,808 2,221
Individually evaluated for impairment 1,609   2,141      
Collectively evaluated for impairment 166,285   165,756      
Total 167,894   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 4,946   4,657      
Total 4,969 4,711 4,657 3,153 4,926 4,334
Individually evaluated for impairment 744   1,742      
Collectively evaluated for impairment 369,132   346,697      
Total 369,876   348,439      
Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Individually evaluated for impairment 162   137      
Collectively evaluated for impairment 3,632   3,826      
Total 3,899 4,114 4,086 3,470 3,666 3,747
Individually evaluated for impairment 1,891   1,642      
Collectively evaluated for impairment 243,860   234,565      
Total 245,941   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 105   123      
Loan balance of loans acquired with credit deterioration 190   131      
Real Estate Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 366   371      
Total 366 408 371 434 498 428
Collectively evaluated for impairment 56,274   58,898      
Total 56,274   58,898      
Farm Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 476   538      
Total 476 496 538 584 799 822
Individually evaluated for impairment 1,398   953      
Collectively evaluated for impairment 41,891   46,040      
Total 43,289   46,993      
Consumer and Other [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 358   382      
Total 358 358 382 190 190 200
Individually evaluated for impairment 2   3      
Collectively evaluated for impairment 19,106   18,557      
Total 19,108   18,560      
Unallocated [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Collectively evaluated for impairment 529   382      
Total $ 529 $ 528 $ 382 $ 408 $ 633 $ 697