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Allowance for Loan Losses - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Contract
Jun. 30, 2013
Contract
Jun. 30, 2014
Contract
Jun. 30, 2013
Contract
Dec. 31, 2013
Receivables [Abstract]          
Troubled debt restructurings (TDRs) $ 2,000,000   $ 2,000,000   $ 1,900,000
TDRs performing under the restructured terms 978,000 829,000 978,000 829,000  
Pre-modification recorded investment totaled     283,000    
Post-modification recorded investment totaled     344,000    
Loans modified under TDRs 0 0 1 0  
Troubled debt restructuring loan subsequent default $ 0 $ 0 $ 0 $ 0  
Troubled debt restructuring loan subsequent default period     90 days