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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, 2017
Dec. 31, 2016
Financing Receivable, Modifications [Line Items]    
Total TDRs $ 9,009 $ 20,859
Performing TDRs [Member]    
Financing Receivable, Modifications [Line Items]    
Beginning balance 19,233 42,687
New modifications 3,143 1,996
Payoffs and payments, net (14,752) (34,001)
TDRs returned to accrual status 329 8,551
TDRs placed on nonaccrual status (3,144) 0
Ending balance 4,809 19,233
Nonperforming TDRs [Member]    
Financing Receivable, Modifications [Line Items]    
Beginning balance 1,626 12,622
New modifications 2,066 102
Charge-offs 0 (38)
Payoffs and payments, net (2,307) (2,509)
TDRs returned to accrual status (329) (8,551)
TDRs placed on nonaccrual status 3,144 0
Ending balance $ 4,200 $ 1,626