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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Financing Receivable, Modifications [Line Items]        
Total TDRs $ 20,965 $ 32,321 $ 20,965 $ 32,321
Performing TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Beginning balance 19,702 37,321 19,233 42,687
New modifications 0 112 3,143 1,118
Payoffs and payments, net 16 (17,141) (2,987) (23,513)
TDRs returned to accrual status 0 0 329 0
TDRs placed on nonaccrual status (3,144) 0 (3,144) 0
Ending balance 16,574 20,292 16,574 20,292
Nonperforming TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Beginning balance 1,407 12,360 1,626 12,622
New modifications 0 0 2,066 82
Charge-offs 0 0 0 (38)
Payoffs and payments, net (160) (331) (2,116) (637)
TDRs returned to accrual status 0 0 (329) 0
TDRs placed on nonaccrual status 3,144 0 3,144 0
Ending balance $ 4,391 $ 12,029 $ 4,391 $ 12,029