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Commitments And Contingencies - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Other Liabilities
Sep. 30, 2012
Interest rate swaps
Dec. 31, 2011
Interest rate swaps
Sep. 30, 2012
Interest rate swaps
Commercial Loan
Dec. 31, 2011
Forward commitments to sell residential mortgage loans
Legal Proceedings [Line Items]            
Notional amount of derivative     $ 43,000,000 $ 43,000,000 $ 8,100,000 $ 7,773,000
Cash held as collateral 13,000,000          
Fair value derivative liability     12,200,000      
Increase in fair value of swap agreement classified as other liabilities   645,000        
Net Payment on Derivatives $ 1,500,000