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Loans - Maturity Schedule by Major Category of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Consumer Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year $ 10,419
Maturity schedule by major category of loans, After One Year Within Five Years 19,495
Maturity schedule by major category of loans, After Five Years 65,949
Agricultural Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 2,988
Maturity schedule by major category of loans, After One Year Within Five Years 14,550
Maturity schedule by major category of loans, After Five Years 30,207
Agricultural [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 36,743
Maturity schedule by major category of loans, After One Year Within Five Years 22,880
Maturity schedule by major category of loans, After Five Years 3,770
Commercial Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 44,870
Maturity schedule by major category of loans, After One Year Within Five Years 95,279
Maturity schedule by major category of loans, After Five Years 125,753
Commercial and Industrial [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 58,309
Maturity schedule by major category of loans, After One Year Within Five Years 34,190
Maturity schedule by major category of loans, After Five Years 5,793
Consumer [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 5,456
Maturity schedule by major category of loans, After One Year Within Five Years 13,167
Maturity schedule by major category of loans, After Five Years 4,178
Industrial Development Bonds [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 1,633
Maturity schedule by major category of loans, After One Year Within Five Years 529
Maturity schedule by major category of loans, After Five Years $ 2,001