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Loan and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Activity Related to Troubled Debt Restructurings (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Performing TDRs [Member]
        
Financing Receivable, Modifications [Line Items]        
Beginning balance $ 57,591 $ 41,873 $ 50,392 $ 38,554
New modifications 11,119 7,246 21,364 10,600
Payoffs and payments, net (7,144) (1,352) (11,339) (1,904)
TDRs returned to accrual status 1,149 517 1,149 517
TDRs placed on nonaccrual status   (2,524)   (2,524)
Ending balance 61,566 45,243 61,566 45,243
Nonperforming TDRs [Member]
        
Financing Receivable, Modifications [Line Items]        
Beginning balance 29,566 18,620 31,309 23,844
New modifications 28 12,951 128 12,951
Payoffs and payments, net (3,097) (2,342) (3,791) (7,049)
TDRs returned to accrual status (1,149) (517) (1,149) (517)
TDRs placed on nonaccrual status   2,524   2,524
Ending balance $ 26,497 $ 31,753 $ 26,497 $ 31,753