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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Investment Program, Proportional Amortization Method, Elected [Line Items] |  |  |  |  |  |  |
Investments for qualified affordable housing projects included in other assets | $ 14,188,000 |  | $ 14,188,000 |  | $ 14,188,000 |  | $ 15,122,000
Unfunded commitments related to the investments in qualified affordable housing projects | 4,161,000 |  | 4,161,000 |  | 4,161,000 |  | $ 5,722,000
Recognized amortization expense | 312,000 | $ 252,000 |  |  | 935,000 | $ 760,000 |
Recognized tax credits and other benefits from its investments in affordable housing tax credits | 461,000 | 428,000 |  |  | $ 1,382,000 | $ 1,285,000 |
Impairment losses related to its investments in qualified affordable housing projects | $ 0 | $ 0 | $ 0 | $ 0 |  |  |

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