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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss), Before Tax | $ (7,371) | $ 13,302 | $ (84,791)
Other comprehensive income (loss), Tax Effect | (1,544) | 2,787 | (17,926)
Other comprehensive income (loss), Net of Tax | (5,827) | 10,515 | (66,865)
Net unrealized Losses on Investment Securities [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive gain before reclassifications | (7,338) | 12,330 | (85,517)
Amounts reclassified from accumulated other comprehensive loss | (33) | 0 | (10)
Other comprehensive income (loss), Before Tax | (7,371) | 12,330 | (85,527)
Other comprehensive income (loss), before reclassifications | (1,537) | 2,583 | (18,079)
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect | (7) | 0 | (2)
Other comprehensive income (loss), Tax Effect | (1,544) | 2,583 | (18,081)
Other comprehensive income (loss) before reclassifications, Net of Tax | (5,801) | 9,747 | (67,438)
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax | (26) | 0 | (8)
Other comprehensive income (loss), Net of Tax | (5,827) | 9,747 | (67,446)
Defined Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive gain before reclassifications | 0 | 972 | 736
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0
Other comprehensive income (loss), Before Tax | 0 | 972 | 736
Other comprehensive income (loss), before reclassifications | 0 | 204 | 155
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect | 0 | 0 | 0
Other comprehensive income (loss), Tax Effect | 0 | 204 | 155
Other comprehensive income (loss) before reclassifications, Net of Tax | 0 | 768 | 581
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax | 0 | 0 | 0
Other comprehensive income (loss), Net of Tax | $ 0 | $ 768 | $ 581

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