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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 ($)
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccruing loans, current $ 5,400,000 $ 7,900,000
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 1,200,000 456,000
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 440,000 9,100,000
90+ Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 1,600,000 $ 3,500,000