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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 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) | $ (4) | $ 0 | $ 1,142 | $ 0
Unrealized holding gains (losses) on available for sale securities, net of tax | 9,008 | 2,852 | 31,106 | (8,346)
Amortization of actuarial losses and Total amounts reclassified out of accumulated other comprehensive loss | (164) | (115) | (328) | (230)
Total other comprehensive income (loss) | 9,008 | 2,852 | 31,106 | (8,346)
Unrealized holding gains (losses) on available for sale securities before reclassifications |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Unrealized holding gains (losses) on available for sale securities before reclassifications | 12,792 | 1,106 | 43,018 | (14,793)
Realized gain (loss) on debt securities andTotal amounts reclassified out of accumulated other comprehensive income (loss) | (4) | 2,945 | 1,142 | 2,945
Unrealized holding gains (losses) on available for sale securities after reclassifications | 12,788 | 4,051 | 44,160 | (11,848)
Tax effect | (3,780) | (1,199) | (13,054) | 3,502
Unrealized holding gains (losses) on available for sale securities, net of tax | 9,008 | 2,852 | 31,106 | (8,346)
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 | 164 | 115 | 328 | 230
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 | $ (164) | $ (115) | $ (328) | $ (230)

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