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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, 2018
Dec. 31, 2017
Financing Receivable, Modifications [Line Items]    
Total TDRs $ 7,103 $ 9,009
Performing TDRs [Member]    
Financing Receivable, Modifications [Line Items]    
Beginning balance 4,809 19,233
New modifications 311 3,143
Payoffs/payments, net and other (1,526) (14,752)
TDRs returned to accrual status 0 329
TDRs placed on nonaccrual status 0 (3,144)
Ending balance 3,594 4,809
Nonperforming TDRs [Member]    
Financing Receivable, Modifications [Line Items]    
Beginning balance 4,200 1,626
New modifications 316 2,066
Charge-offs 0 0
Payoffs/payments, net and other (1,007) (2,307)
TDRs returned to accrual status 0 (329)
TDRs placed on nonaccrual status 0 3,144
Ending balance $ 3,509 $ 4,200