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Loans - Recorded Investment in Nonaccrual Loans by Portfolio Segment of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans $ 3,329 $ 4,828
Consumer Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans 483 964
Agricultural Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans      
Agricultural [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans      
Commercial Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans 2,436 877
Commercial and Industrial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans 410 2,987
Consumer [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Investment in nonaccrual loans