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Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in, and Aging of, Past Due and Nonaccrual Loans, Including PCI Loans by Class of Loans (Parenthetical) (Detail) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccruing loans, current $ 1,100,000 $ 1,200,000
Nonaccrual 6,792,000 5,277,000
Small Business Administration Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 1,598,000 2,032,000
Small Business Administration Loans [Member] | Financial Guarantee [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual loans 1,300,000 2,000,000.0
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual   59,000
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 267,000 1,100,000
90+ Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 5,500,000 $ 2,900,000