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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Line Items]    
Statutory federal income tax rate 34.00%  
Retained earnings-substantially restricted $ 34,101,000 $ 32,297,000
Bad Debt Reserve for Tax Purposes of US Savings and Loan Associations or Other Qualified Thrift Lender
   
Income Tax Disclosure [Line Items]    
Retained earnings-substantially restricted 1,000,000 1,000,000
Unrecorded deferred liability $ 354,000 $ 354,000