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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
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]    
Total TDRs $ 55,309 $ 73,874
Performing TDRs [Member]    
Financing Receivable, Modifications [Line Items]    
Beginning balance 53,589 66,955
New modifications 3,689 462
Payoffs and payments, net (15,235) (14,527)
TDRs returned to accrual status 644 699
TDRs placed on nonaccrual status 0 0
Ending balance 42,687 53,589
Nonperforming TDRs [Member]    
Financing Receivable, Modifications [Line Items]    
Beginning balance 20,285 25,119
New modifications 661 4,372
Charge-offs 0 (1,061)
Transfer to OREO (842)  
Payoffs and payments, net 6,838 7,446
TDRs returned to accrual status (644) (699)
TDRs placed on nonaccrual status 0 0
Ending balance $ 12,622 $ 20,285