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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
Mar. 31, 2014
Commercial Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate $ 170,058
Distribution of variable rate loans by major loan category, Variable Rate 91,576
Agricultural Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 35,240
Distribution of variable rate loans by major loan category, Variable Rate 14,389
Consumer Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 74,606
Distribution of variable rate loans by major loan category, Variable Rate 16,762
Commercial and Industrial [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 68,909
Distribution of variable rate loans by major loan category, Variable Rate 21,115
Agricultural [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 60,876
Distribution of variable rate loans by major loan category, Variable Rate 3,983
Consumer [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 17,194
Distribution of variable rate loans by major loan category, Variable Rate 4,128
Industrial Development Bonds [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 4,137
Distribution of variable rate loans by major loan category, Variable Rate $ 197