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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Modifications [Line Items]        
Total TDRs $ 8,422 $ 20,965 $ 8,422 $ 20,965
Performing TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Beginning balance 4,285 19,702 4,809 19,233
New modifications 311 0 311 3,143
Payoffs/payments, net and other (66) 16 (590) (2,987)
TDRs returned to accrual status 0 0 0 329
TDRs placed on nonaccrual status 0 (3,144) 0 (3,144)
Ending balance 4,530 16,574 4,530 16,574
Nonperforming TDRs [Member]        
Financing Receivable, Modifications [Line Items]        
Beginning balance 3,909 1,407 4,200 1,626
New modifications 38 0 38 2,066
Charge-offs 0 0 0 0
Payoffs/payments, net and other (55) (160) (346) (2,116)
TDRs returned to accrual status 0 0 0 (329)
TDRs placed on nonaccrual status 0 3,144 0 3,144
Ending balance $ 3,892 $ 4,391 $ 3,892 $ 4,391