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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 ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccruing loans, current | $ 1,400 |  | $ 1,400 |  |
Nonaccrual | 25,969 | [1],[2] | 27,795 | [3] |
SBA [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | 1,265 | [1],[2] | 1,529 | [3] |
Financial Guarantee [Member] | SBA [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual | $ 3,000 |  |  |  |
30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual |  |  | 102,000 |  |
90+ Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual |  |  | $ 26,300 |  | $ 24,500
[1] | As of June 30, 2025, $1.4 million of nonaccruing loans were current, $24.5 million were 90+ days past due.
[2] | Excludes $3,000 of guaranteed portion of nonaccrual SBA loans that are in process of collection.
[3] | As of December 31, 2024, $1.4 million of nonaccruing loans were current, $102,000 were 60-89 days past due, and $26.3 million were 90+ days past due.

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