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Allowance for Loan and Lease Losses - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Minimum
Jun. 30, 2012
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Troubled debt restructuring reserves amount $ 4,669 $ 3,635    
Appraisal receiving period     30 days 60 days
Percentage collateral to impaired loan balances 76.00%      
General reserve established for probable incurred losses on unimpaired loans $ 6,192 $ 8,529