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Loans - Distribution of Fixed Rate Loans and Variable Rate Loans by Major Loan Category (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Consumer Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate $ 77,757
Distribution of variable rate loans by major loan category, Variable Rate 19,894
Agricultural Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 34,129
Distribution of variable rate loans by major loan category, Variable Rate 14,683
Agricultural [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 62,153
Distribution of variable rate loans by major loan category, Variable Rate 5,068
Commercial Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 175,742
Distribution of variable rate loans by major loan category, Variable Rate 98,332
Commercial and Industrial [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 69,495
Distribution of variable rate loans by major loan category, Variable Rate 23,431
Consumer [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 19,191
Distribution of variable rate loans by major loan category, Variable Rate 4,264
Industrial Development Bonds [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 4,685
Distribution of variable rate loans by major loan category, Variable Rate $ 169