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Fair Value Measurements - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Provisions for loan losses $ 400,000 $ 350,000 $ 300,000 $ 475,000 $ 500,000 $ 400,000 $ 425,000 $ 500,000 $ 1,525,000 $ 1,825,000
Impaired Loans
                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Provisions for loan losses                 $ 185,000 $ 182,000
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 | 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                 48.00%  
Fair value measurement, estimated costs to sell the collateral                 15.00%