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Fair Value Measurements - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Provisions for loan losses $ 100,000 $ 350,000 $ 575,000 $ 1,125,000
Impaired Loans
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Provisions for loan losses 284,000   329,000  
Impaired Loans | Level 3 | Minimum
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurement, discount rate     10.00%  
Fair value measurement, estimated costs to sell the collateral     10.00%  
Impaired Loans | Level 3 | Maximum
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurement, discount rate     20.00%  
Fair value measurement, estimated costs to sell the collateral     15.00%  
Foreclosed Real Estate
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Foreclosed real estate write down charges $ 10,000   $ 32,000  
Foreclosed Real Estate | Level 3 | Minimum
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurement, discount rate     10.00%  
Fair value measurement, estimated costs to sell the collateral     10.00%  
Foreclosed Real Estate | Level 3 | Maximum
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value measurement, discount rate     20.00%  
Fair value measurement, estimated costs to sell the collateral     15.00%