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Loans - Maturity Schedule by Major Category of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Commercial Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year $ 46,874
Maturity schedule by major category of loans, After One Year Within Five Years 98,903
Maturity schedule by major category of loans, After Five Years 115,857
Agricultural Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 2,986
Maturity schedule by major category of loans, After One Year Within Five Years 15,099
Maturity schedule by major category of loans, After Five Years 31,544
Consumer Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 9,786
Maturity schedule by major category of loans, After One Year Within Five Years 16,834
Maturity schedule by major category of loans, After Five Years 64,748
Commercial and Industrial [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 49,684
Maturity schedule by major category of loans, After One Year Within Five Years 34,923
Maturity schedule by major category of loans, After Five Years 5,417
Agricultural [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 40,408
Maturity schedule by major category of loans, After One Year Within Five Years 20,987
Maturity schedule by major category of loans, After Five Years 3,464
Consumer [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 5,316
Maturity schedule by major category of loans, After One Year Within Five Years 12,318
Maturity schedule by major category of loans, After Five Years 3,688
Industrial Development Bonds [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Maturity schedule by major category of loans, Within One Year 1,933
Maturity schedule by major category of loans, After One Year Within Five Years 542
Maturity schedule by major category of loans, After Five Years $ 1,859