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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in, and Aging of, Past Due and Nonaccrual Loans, Excluding PCI Loans by Class of Loans (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccruing loans, current $ 3,600 $ 4,700
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual   514
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 376 435
90+ Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 6,800 $ 1,500