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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Other Commitments [Line Items] |  |  |  |
Outstanding loan commitments | $ 273,800,000 | $ 273,800,000 |  | $ 283,200,000
Cancellable amounts | 111,400,000 | 111,400,000 |  | 108,400,000
Outstanding stand-by letters of credit | 13,500,000 | 13,500,000 |  | 12,500,000
Provision for credit losses for unfunded commitments | 0 | 0 |  |
Previously unearned sale proceeds | 300,000 | 42,075,000 | $ 132,141,000 |
Future commitments outstanding related to investments | 5,600,000 | 5,600,000 |  |
MSR Assets [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Reserve | 1,400,000 | 1,400,000 |  | 1,800,000
Other Liabilities [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Reserves for unfunded commitments to borrowers | $ 900,000 | $ 900,000 |  | $ 900,000

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