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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, Including PCI Loans by Class of Loans (Parenthetical) (Detail) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccruing loans, current $ 1,200,000 $ 2,300,000
Small Business Administration Loans [Member] | Financial Guarantee [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 2,000,000.0  
Community Bank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 3,500,000 12,300,000
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 59,000 33,000
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 1,100,000 57,000
90+ Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 2,900,000 $ 17,600,000