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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Investment Program, Proportional Amortization Method, Elected [Line Items] |  |  |  |  |
Investments in qualified affordable housing projects included in other assets | $ 16,760 |  | $ 16,760 |  | $ 15,850
Unfunded commitments related to the investments in qualified affordable housing projects | 5,479 |  | 5,479 |  | $ 5,668
Recognized amortization expense | 374 | $ 312 | 1,090 | $ 935 |
Recognized tax credits and other benefits from its investments in affordable housing tax credits | 416 | 461 | 1,248 | 1,382 |
Impairment losses related to its investments in qualified affordable housing projects | $ 0 | $ 0 | $ 0 | $ 0 |
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration] | Other Assets |  | Other Assets |  | Other Assets
Investment Program Proportional Amortization Method Applied Income Tax Credit And Other Tax Benefit Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag | true | true | true | true |
Investment Program, Proportional Amortization Method Elected Income Tax Credit And Other Income Tax Benefit Before Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag | true | true | true | true |
Investment Program, Proportional Amortization Method Elected Income Tax Credit And Other Income Tax Benefit Before Amortization Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag | true | true | true | true |

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