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Loans - Recorded Investment in Nonaccrual Loans by Portfolio Segment of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans $ 1,634 $ 3,329 $ 2,908
Consumer Real Estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans 568 483  
Agricultural Real Estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans 0 0  
Agricultural [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans 2 0  
Commercial Real Estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans 709 2,436  
Commercial and Industrial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans 350 410  
Consumer [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans $ 5 $ 0