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Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Times
Sep. 30, 2012
Sep. 30, 2013
Times
Sep. 30, 2012
Dec. 31, 2012
Times
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Days principal payments should be past due for recognition of income on a loan be discontinued and previously accrued interest is reversed 90 days   90 days    
Loan charge-off, amount $ 114,000 $ 259,000 $ 708,000 $ 897,000  
Loan portfolio risk factor 1.18   1.18   1.15
Increase in estimated allowance for loan losses     62,000    
Days loans are past due to be nonperforming loans     90 days   90 days
Commitments to lend additional funds 0   0   0
Specific allowance for loan losses related to TDRs modified 100,000 350,000 575,000 1,125,000  
Installment Loans
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan charge-off period     90 days    
Bank Overdrafts
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan charge-off period     45 days    
Overall Qualitative Factor
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase in estimated allowance for loan losses     345,000   419,000
Qualitative Factor Economic Condition
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio risk factor 1.20   1.20   1.20
Qualitative Factor Past Due Loans
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio risk factor 1.20   1.20   1.20
Qualitative Factor Other Internal and External Factors
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan portfolio risk factor 1.30   1.30   1.20
Partial charge-off loan
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan charge-off, amount     497,000    
Number of loan     11    
Classified Loans
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase in estimated allowance for loan losses     400,000   664,000
Troubled Debt Restructuring
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Principal charge-offs recorded as a result of TDRs 0 0 0 0  
Specific allowance for loan losses related to TDRs modified 0   0    
Minimum
          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Period of performance borrower need to demonstrate for a loan be restored to accrual status     6 months    
Value of significant property $ 200,000   $ 200,000