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Loans - Maturity Schedule by Major Category of Loans (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014
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Consumer Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maturity schedule by major category of loans, Within One Year | $ 10,820
Maturity schedule by major category of loans, After One Year Within Five Years | 19,204
Maturity schedule by major category of loans, After Five Years | 67,627
Agricultural Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maturity schedule by major category of loans, Within One Year | 3,558
Maturity schedule by major category of loans, After One Year Within Five Years | 14,253
Maturity schedule by major category of loans, After Five Years | 31,001
Agricultural [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maturity schedule by major category of loans, Within One Year | 39,834
Maturity schedule by major category of loans, After One Year Within Five Years | 23,228
Maturity schedule by major category of loans, After Five Years | 4,159
Commercial Real Estate [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maturity schedule by major category of loans, Within One Year | 43,036
Maturity schedule by major category of loans, After One Year Within Five Years | 92,764
Maturity schedule by major category of loans, After Five Years | 138,274
Commercial and Industrial [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maturity schedule by major category of loans, Within One Year | 55,248
Maturity schedule by major category of loans, After One Year Within Five Years | 31,686
Maturity schedule by major category of loans, After Five Years | 5,992
Consumer [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maturity schedule by major category of loans, Within One Year | 5,307
Maturity schedule by major category of loans, After One Year Within Five Years | 14,137
Maturity schedule by major category of loans, After Five Years | 4,011
Industrial Development Bonds [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Maturity schedule by major category of loans, Within One Year | 2,363
Maturity schedule by major category of loans, After One Year Within Five Years | 340
Maturity schedule by major category of loans, After Five Years | $ 2,151

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