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Other Comprehensive Income (Loss) - Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Before-Tax Amount |  |  |
Change in net unrealized gain (loss) during the period |  | $ 12,761 |
Net unrealized gains/losses / Other comprehensive (loss) income | $ 110,841 | (202,310) | $ (31,619)
Tax (Expense) Benefit |  |  |
Reclassification adjustment |  | (3,127) |
Other Comprehensive Income, Net unrealized losses | (27,157) | 49,571 | 7,743
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications |  | 9,634 |
Other comprehensive (loss) income | 83,684 | (152,739) | (23,876)
Available-for-sale securities |  |  |
Before-Tax Amount |  |  |
Change in net unrealized gain (loss) during the period | 35,008 | (229,463) | (46,301)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 69,984 | 11,916 | (275)
Net unrealized gains/losses / Other comprehensive (loss) income | 104,992 | (217,547) | (46,576)
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications | (8,578) | 56,223 | 11,340
Reclassification adjustment | (17,146) | (2,919) | 67
Other Comprehensive Income, Net unrealized losses | (25,724) | 53,304 | 11,407
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications | 26,430 | (173,240) | (34,961)
Reclassification adjustment | 52,838 | 8,997 | (208)
Other comprehensive (loss) income | 79,268 | (164,243) | (35,169)
Net retirement plan actuarial (loss) gain |  |  |
Before-Tax Amount |  |  |
Change in net unrealized gain (loss) during the period | 4,516 |  | 11,785
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 1,116 | 2,260 | 2,951
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications | (1,106) |  | (2,887)
Reclassification adjustment | (273) | (554) | (723)
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications | 3,410 |  | 8,898
Reclassification adjustment | 843 | 1,706 | 2,228
Amortization of net retirement plan prior service cost |  |  |
Before-Tax Amount |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 217 | 216 | 221
Tax (Expense) Benefit |  |  |
Reclassification adjustment | (54) | (52) | (54)
Net of Tax |  |  |
Reclassification adjustment | 163 | 164 | 167
Employee benefit plans |  |  |
Before-Tax Amount |  |  |
Net unrealized gains/losses / Other comprehensive (loss) income | 5,849 | 15,237 | 14,957
Tax (Expense) Benefit |  |  |
Other Comprehensive Income, Net unrealized losses | (1,433) | (3,733) | (3,664)
Net of Tax |  |  |
Other comprehensive (loss) income | $ 4,416 | $ 11,504 | $ 11,293

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