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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, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccruing loans, current | $ 1,500,000 | $ 1,400,000
Nonaccrual | 8,471,000 | 14,347,000
Nonaccrual loans |  | 184,000
30-59 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual |  | 2,000
60-89 Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual | 42,000 | 1,300,000
90+ Days Past Due [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual | $ 6,900,000 | $ 11,600,000

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