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Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Activity Related to Troubled Debt Restructurings (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financing Receivable, Modifications [Line Items]        
Total TDRs $ 60,361 $ 78,214 $ 60,361 $ 78,214
Performing TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Beginning balance 45,166 61,878 53,589 66,955
New modifications 2,353 0 2,383 41
Payoffs and payments, net (2,306) (6,270) (11,275) (11,388)
TDRs returned to accrual status 0 0 516 0
TDRs placed on nonaccrual status 0 0 0 0
Ending balance 45,213 55,608 45,213 55,608
Nonperforming TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Beginning balance 15,167 27,397 20,285 25,119
New modifications 330 0 661 4,187
Charge-offs 0 (1,061) 0 (1,061)
Transfer to OREO 0 0 (842) 0
Payoffs and payments, net (349) (3,730) (4,440) (5,639)
TDRs returned to accrual status 0 0 (516) 0
TDRs placed on nonaccrual status 0 0 0 0
Ending balance $ 15,148 $ 22,606 $ 15,148 $ 22,606