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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Before-Tax Amount |  |  |
Change in net unrealized gain (loss) during the period |  | $ 4,516 |
Net unrealized gains/losses / Other comprehensive (loss) income | $ 7,578 | 110,841 | $ (202,310)
Tax (Expense) Benefit |  |  |
Reclassification adjustment |  | (1,106) |
Other Comprehensive Income, Net unrealized losses | (1,065) | (27,157) | 49,571
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications |  | 3,410 |
Other comprehensive income (loss) | 6,513 | 83,684 | (152,739)
Available-for-sale securities |  |  |
Before-Tax Amount |  |  |
Change in net unrealized gain (loss) during the period | (3,709) | 35,008 | (229,463)
Reclassification adjustment for net realized gains on sale of available-for-sale debt securities included in net income | (50) | 69,984 | 11,916
Net unrealized gains/losses / Other comprehensive (loss) income | (3,759) | 104,992 | (217,547)
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications | 1,588 | (8,578) | 56,223
Reclassification adjustment | 12 | (17,146) | (2,919)
Other Comprehensive Income, Net unrealized losses | 1,600 | (25,724) | 53,304
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications | (2,121) | 26,430 | (173,240)
Reclassification adjustment | (38) | 52,838 | 8,997
Other comprehensive income (loss) | (2,159) | 79,268 | (164,243)
Net retirement plan actuarial (loss) gain |  |  |
Before-Tax Amount |  |  |
Change in net unrealized gain (loss) during the period | 10,240 |  | 12,761
Reclassification adjustment for net realized gains on sale of available-for-sale debt securities included in net income | 915 | 1,116 | 2,260
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications | (2,408) |  | (3,127)
Reclassification adjustment | (215) | (273) | (554)
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications | 7,832 |  | 9,634
Reclassification adjustment | 700 | 843 | 1,706
Amortization of net retirement plan prior service cost |  |  |
Before-Tax Amount |  |  |
Reclassification adjustment for net realized gains on sale of available-for-sale debt securities included in net income | 182 | 217 | 216
Tax (Expense) Benefit |  |  |
Reclassification adjustment | (42) | (54) | (52)
Net of Tax |  |  |
Reclassification adjustment | 140 | 163 | 164
Employee benefit plans |  |  |
Before-Tax Amount |  |  |
Net unrealized gains/losses / Other comprehensive (loss) income | 11,337 | 5,849 | 15,237
Tax (Expense) Benefit |  |  |
Other Comprehensive Income, Net unrealized losses | (2,665) | (1,433) | (3,733)
Net of Tax |  |  |
Other comprehensive income (loss) | $ 8,672 | $ 4,416 | $ 11,504

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