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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss), before tax | $ 13,302 | $ (84,791) | $ (7,339)
Other comprehensive loss, Tax Effect | 2,787 | (17,926) | (1,540)
Other comprehensive loss, Net of Tax | 10,515 | (66,865) | (5,799)
Net unrealized Losses on Investment Securities [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | 12,330 | (85,517) | (8,570)
Amounts reclassified from accumulated other comprehensive income (loss), Before Tax | 0 | (10) | (1)
Other comprehensive income (loss), before tax | 12,330 | (85,527) | (8,571)
Other comprehensive income (loss), before reclassifications | 2,583 | (18,079) | (1,799)
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect | 0 | (2) | 0
Other comprehensive loss, Tax Effect | 2,583 | (18,081) | (1,799)
Other comprehensive income (loss) before reclassifications, Net of Tax | 9,747 | (67,438) | (6,771)
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax | 0 | (8) | (1)
Other comprehensive loss, Net of Tax | 9,747 | (67,446) | (6,772)
Defined Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications | 972 | 736 | 992
Amounts reclassified from accumulated other comprehensive income (loss), Before Tax | 0 | 0 | 240
Other comprehensive income (loss), before tax | 972 | 736 | 1,232
Other comprehensive income (loss), before reclassifications | 204 | 155 | 209
Amounts reclassified from accumulated other comprehensive income (loss), Tax Effect | 0 | 0 | 50
Other comprehensive loss, Tax Effect | 204 | 155 | 259
Other comprehensive income (loss) before reclassifications, Net of Tax | 768 | 581 | 783
Amounts reclassified from accumulated other comprehensive income (loss), Net of Tax | 0 | 0 | 190
Other comprehensive loss, Net of Tax | $ 768 | $ 581 | $ 973

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