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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, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccruing loans, current $ 2,300   $ 3,600
Community Bank [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans   $ 12,300  
30-59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 33    
60-89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual 57   376
90+ Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual $ 17,600   $ 6,800