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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022
Other Commitments [Line Items] |  |  |  |
Outstanding loan commitments | $ 590,100 | $ 590,100 |  | $ 736,100
Outstanding stand-by letters of credit | 23,300 | 23,300 |  | 29,800
Reserve for unfunded commitments | 4,000 | 4,000 | $ 3,700 | 1,812
Credit losses for unfunded commitments | 550 | 1,600 |  |
Future commitments outstanding related to investments | $ 16,600 | $ 16,600 |  |
Other Liabilities [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Reserve for unfunded commitments |  |  |  | $ 1,800

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