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Loans - Maturity Schedule by Major Category of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maturity schedule by major category of loans, Within One Year $ 148,846  
Maturity schedule by major category of loans, After One Year Within Five Years 203,865  
Maturity schedule by major category of loans, After Five Years 223,632  
Maturity schedule by major category of loans, Total 576,343 501,535
Commercial Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maturity schedule by major category of loans, Within One Year 34,689  
Maturity schedule by major category of loans, After One Year Within Five Years 101,279  
Maturity schedule by major category of loans, After Five Years 112,925  
Maturity schedule by major category of loans, Total 248,893 199,999
Agricultural Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maturity schedule by major category of loans, Within One Year 1,981  
Maturity schedule by major category of loans, After One Year Within Five Years 11,301  
Maturity schedule by major category of loans, After Five Years 31,019  
Maturity schedule by major category of loans, Total 44,301 40,143
Consumer Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maturity schedule by major category of loans, Within One Year 10,483  
Maturity schedule by major category of loans, After One Year Within Five Years 16,694  
Maturity schedule by major category of loans, After Five Years 65,261  
Maturity schedule by major category of loans, Total 92,438 80,287
Commercial and Industrial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maturity schedule by major category of loans, Within One Year 54,079  
Maturity schedule by major category of loans, After One Year Within Five Years 39,597  
Maturity schedule by major category of loans, After Five Years 5,822  
Maturity schedule by major category of loans, Total 99,498 101,624
Agricultural [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maturity schedule by major category of loans, Within One Year 40,158  
Maturity schedule by major category of loans, After One Year Within Five Years 21,682  
Maturity schedule by major category of loans, After Five Years 3,609  
Maturity schedule by major category of loans, Total 65,449 57,770
Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maturity schedule by major category of loans, Within One Year 5,524  
Maturity schedule by major category of loans, After One Year Within Five Years 12,770  
Maturity schedule by major category of loans, After Five Years 3,112  
Maturity schedule by major category of loans, Total 21,406 20,413
Industrial Development Bonds [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maturity schedule by major category of loans, Within One Year 1,932  
Maturity schedule by major category of loans, After One Year Within Five Years 542  
Maturity schedule by major category of loans, After Five Years 1,884  
Maturity schedule by major category of loans, Total $ 4,358 $ 1,299