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Loans - Loan Balances (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 1,100,817 $ 1,055,506  
Allowance for loan losses (13,047) (13,305) $ (13,047)
Net loans 1,087,770 1,042,201  
Commercial and Agriculture [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 143,708 135,462  
Commercial Real Estate Owner Occupied [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 172,262 161,364  
Commercial Real Estate Non Owner Occupied [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 405,876 395,931  
Residential Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 258,580 247,308  
Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 63,538 56,293  
Farm Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans 39,069 41,170  
Consumer and Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 17,784 $ 17,978