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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Provisions for loan losses $ 250,000 $ 475,000
Impaired Loans
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Provisions for loan losses 45,000  
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 $ 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 48.00%  
Fair value measurement, estimated costs to sell the collateral 15.00%