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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	$ 41,081
Distribution of variable rate loans by major loan category, Variable Rate	13,978
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	68,594
Distribution of variable rate loans by major loan category, Variable Rate	4,599
Industrial Development Bonds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	6,509
Distribution of variable rate loans by major loan category, Variable Rate	140
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	70,370
Distribution of variable rate loans by major loan category, Variable Rate	17,852
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	210,079
Distribution of variable rate loans by major loan category, Variable Rate	91,762
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	22,379
Distribution of variable rate loans by major loan category, Variable Rate	4,061
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Distribution of fixed rate loans by major loan category, Fixed Rate	66,815
Distribution of variable rate loans by major loan category, Variable Rate	$ 17,556