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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
Dec. 31, 2013
Commercial Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate $ 150,698
Distribution of variable rate loans by major loan category, Variable Rate 98,195
Agricultural Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 34,741
Distribution of variable rate loans by major loan category, Variable Rate 9,560
Consumer Real Estate [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 75,105
Distribution of variable rate loans by major loan category, Variable Rate 17,333
Commercial and Industrial [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 78,906
Distribution of variable rate loans by major loan category, Variable Rate 20,592
Agricultural [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 60,441
Distribution of variable rate loans by major loan category, Variable Rate 5,008
Consumer [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 16,837
Distribution of variable rate loans by major loan category, Variable Rate 4,569
Industrial Development Bonds [Member]
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Distribution of fixed rate loans by major loan category, Fixed Rate 4,358
Distribution of variable rate loans by major loan category, Variable Rate