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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Summary Of Significant Accounting Policies [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  
Loan charge-off, amount $ 1,198,000 $ 2,427,000
Loan commitments, Fixed rate 830,000  
Percentages of income tax more likely threshold positions 50.00%  
Other Consumer
    
Summary Of Significant Accounting Policies [Line Items]    
Loan charge-off, amount 313,000 302,000
Loan charge-off period 90 days  
Bank Overdrafts
    
Summary Of Significant Accounting Policies [Line Items]    
Loan charge-off period 45 days  
Impaired Loans Partially Charged Off
    
Summary Of Significant Accounting Policies [Line Items]    
Loan charge-off, amount 510,000  
Loan charge-off, number of loans 10  
Impaired Loans Partially Charged Off | Charge Off Treatment
    
Summary Of Significant Accounting Policies [Line Items]    
Loan charge-off, amount 366,000 501,000
Minimum
    
Summary Of Significant Accounting Policies [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