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LOANS - Recorded Investment in Nonaccrual Loans by Portfolio Segment of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans $ 4,609 $ 4,828 $ 4,893
Consumer Real Estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans 551 964  
Agricultural Real Estate [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans 88    
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 1,035 877  
Commercial and Industrial [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans 2,935 2,987  
Consumer [Member]
     
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Investment in nonaccrual loans