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Allowance for Loan and Lease Losses - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Minimum
Jun. 30, 2013
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Troubled debt restructuring reserves amount $ 4,408 $ 4,140    
Appraisal receiving period     30 days 60 days
Percentage collateral to impaired loan balances 92.00%      
General $ 5,030 $ 6,748