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Loans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) Loan | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 21,955,000 |  | $ 21,955,000 |  |  | $ 23,371,000 |  |
Pledged loans receivable, carrying value | 2,440,000,000 |  | 2,440,000,000 |  |  | 2,360,000,000 |  |
Loans receivable | 6,257,744,000 |  | 6,257,744,000 |  |  | 6,182,434,000 |  |
Loans held for sale, at the lower of cost or fair value | 54,336,000 | $ 11,767,000 | 54,336,000 | $ 11,767,000 | $ 10,467,000 | 12,013,000 | $ 7,293,000 | $ 8,043,000
Gains on sale of second draw PPP loans |  |  | 4,669,000 | 4,253,000 |  |  |  |
Proceeds from sale of second draw PPP loans | 23,017,000 | 21,010,000 | 72,094,000 | 70,652,000 |  |  |  |
Interest income on nonaccrual loans | 11,000 | $ 26,000 | 49,000 | $ 160,000 |  |  |  |
Number of loan modified | Loan |  | 0 |  |  |  |  |  |
Other real estate owned ("OREO") | 772,000 |  | 772,000 |  |  | 117,000 |  |
Loans Pledged to Secure Advances |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Pledged loans receivable, carrying value | 2,440,000,000 |  | 2,440,000,000 |  |  | 2,360,000,000 |  |
Payment Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable | 100,000 |  | 100,000 |  |  | 200,000 |  |
Prepaid Expenses and Other Assets |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Other real estate owned ("OREO") | 800,000 |  | 800,000 |  |  | 100,000 |  |
Loans | Accrued Interest |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 18,700,000 |  | $ 18,700,000 |  |  | $ 19,800,000 |  |

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