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Comprehensive Income - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Realized gain (loss) on debt securities andTotal amounts reclassified out of accumulated other comprehensive income (loss) | $ 2,124 | $ (2) | $ 3,266 | $ 2,945
Unrealized holding gains (losses) on available for sale securities, net of tax | 16,399 | 44,538 | 47,505 | 36,192
Amortization of actuarial losses and Total amounts reclassified out of accumulated other comprehensive loss | (165) | (114) | (493) | (344)
Total other comprehensive income | 16,399 | 44,538 | 47,505 | 36,192
Unrealized holding gains on available for sale securities before reclassifications |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Unrealized holding gains on available for sale securities before reclassifications | 21,158 | 63,232 | 64,177 | 48,438
Realized gain (loss) on debt securities andTotal amounts reclassified out of accumulated other comprehensive income (loss) | 2,124 | (2) | 3,266 | 2,945
Unrealized holding gains (losses) on available for sale securities after reclassifications | 23,282 | 63,230 | 67,443 | 51,383
Tax effect | (6,883) | (18,692) | (19,938) | (15,191)
Unrealized holding gains (losses) on available for sale securities, net of tax | 16,399 | 44,538 | 47,505 | 36,192
Unfunded status of the supplemental retirement plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Change in unfunded status of the supplemental retirement plans before reclassifications | 165 | 114 | 493 | 344
Amortization of actuarial losses |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Amortization of actuarial losses and Total amounts reclassified out of accumulated other comprehensive loss | $ (165) | $ (114) | $ (493) | $ (344)

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