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Loans - Additional Information (Detail) (USD $)
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale $ 0 $ 556,000  
Residential mortgage loan 22,600,000 24,200,000  
Impaired loans classified as troubled debt restructured 964,000 861,200 2,900,000
Troubled debt restructuring $ 0   $ 0
Maximum time for re-evaluation (in months) 12 months    
Re-evaluation period for real estate 2 years    
Unsecured consumer loans, credit card credits and overdraft lines of credit reach 90 days    
Delinquent period for charging down consumer loans 120 days    
Delinquent period for charging down commercial and agricultural credits 120 days    
Maximum [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Leverage position of balance sheet 1.50    
Leverage position of customers 2.00    
Minimum [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Repayment period of loan with a reasonable reduction of principal balance 2 years