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Loans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) Loan | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Loan | Sep. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 23,986,000 |  | $ 23,986,000 |  |  | $ 22,937,000 |  |
Pledged loans receivable, carrying value | 2,370,000,000 |  | 2,370,000,000 |  |  | 2,460,000,000 |  |
Sale of residential mortgage loans from the held for investment portfolio | 25,900,000 | $ 20,900,000 | 36,000,000 | $ 70,000,000 |  |  |  |
Loans receivable | 6,528,259,000 |  | 6,528,259,000 |  |  | 6,251,377,000 |  |
Loans held for sale, at the lower of cost or fair value | 6,512,000 | 54,336,000 | 6,512,000 | 54,336,000 | $ 49,611,000 | 8,579,000 | $ 10,467,000 | $ 12,013,000
Gains on sale of second draw PPP loans |  |  | 6,018,000 | 4,669,000 |  |  |  |
Proceeds from sale of second draw PPP loans | 74,513,000 | 23,017,000 | 142,066,000 | 72,094,000 |  |  |  |
Financing receivable interest income | $ 9,000 |  | $ 370,000 |  |  |  |  |
Number of loan modified | Loan | 0 |  | 0 |  |  |  |  |
Credit loss expense | $ 2,145,000 | 2,286,000 | $ 12,496,000 | 3,474,000 |  |  |  |
Other real estate owned ("OREO") | 1,995,000 |  | 1,995,000 |  |  | 117,000 |  |
Retail Commercial Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Payment defaults on loans modified within the preceding 12 months | 0 | $ 0 | 0 | $ 0 |  |  |  |
Loans Pledged to Secure Advances |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Pledged loans receivable, carrying value | 2,370,000,000 |  | 2,370,000,000 |  |  | 2,460,000,000 |  |
ACL Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Credit loss expense |  |  | 1,400,000 |  |  |  |  |
Prepaid Expenses and Other Assets |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Other real estate owned ("OREO") | 2,000,000 |  | 2,000,000 |  |  | 100,000 |  |
Loans | Accrued Interest |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Accrued interest on loans | $ 20,300,000 |  | $ 20,300,000 |  |  | $ 19,100,000 |  |

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