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Loan and Lease Finance Receivables and Allowance for Credit Losses - Schedule Activity of Loans Held-for-Sale (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Write-down of loans held-for-sale   $ (1,700,000)
Non-Covered Loans Held-for-Sale Activity [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 348,000 2,954,000
Originations of mortgage loans 25,489,000 37,304,000
Sales of mortgage loans (22,250,000) (34,962,000)
Transfer of mortgage loans to held-for-investment (3,587,000) (3,292,000)
Sales of other loans   (6,000,000)
Transfers of other loans to held-for-sale   6,000,000
Write-down of loans held-for-sale   (1,656,000)
Balance, end of period   348,000
Covered Loans Held-for-Sale Activity [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance, beginning of period 5,664,000  
Sales of other loans (3,745,000)  
Transfers of other loans to held-for-sale   5,726,000
Write-down of loans held-for-sale (1,219,000) 0
Payment on other loans (700,000) (62,000)
Balance, end of period   $ 5,664,000