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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 ($) | Mar. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccruing loans, current | $ 608,000 |  | $ 13 |
Nonaccrual | 13,810,000 | [1],[2] | 21,302,000 | [3]
Small Business Administration [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual | 54,000 | [1],[2] | 969,000 | [3]
30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual |  |  | 16,000,000 |
60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual | $ 13,200,000 |  |  |
90+ Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Nonaccrual |  |  | $ 8,300,000 |
[1] | As of March 31, 2024, $608,000 of nonaccruing loans were current and $13.2 million were 90+ days past due.
[2] | There were no guaranteed portion of nonaccrual SBA loans that are in process of collection.
[3] | As of December 31, 2023, $13.0 million of nonaccruing loans were current, $16,000 were 30-59 days past due, and $8.3 million were 90+ days past due.

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