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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Performing TDRs [Member]
        
Financing Receivable, Modifications [Line Items]        
Beginning balance $ 61,566 $ 45,243 $ 50,392 $ 38,554
New modifications    9,506 21,364 20,106
Payoffs and payments, net (2,481) (480) (13,820) (2,384)
TDRs returned to accrual status 110    1,259 517
TDRs placed on nonaccrual status    (5,180)    (5,180)
Ending balance 59,195 51,613 59,195 51,613
Nonperforming TDRs [Member]
        
Financing Receivable, Modifications [Line Items]        
Beginning balance 26,497 31,753 31,309 23,844
New modifications 3,676 1,612 3,804 14,563
Charge-offs (68)    (68)   
Payoffs and payments, net (1,950) (2,922) (5,741) (9,971)
TDRs returned to accrual status (110)    (1,259) (517)
TDRs placed on nonaccrual status    5,180    5,180
Ending balance $ 28,045 $ 33,099 $ 28,045 $ 33,099