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Other Comprehensive Income (Loss) - Roll-Forward for AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | $ 4,642,740 | $ 4,861,382 |
Balance, end of year | 5,072,017 | 4,642,740 | $ 4,861,382
Accumulated other comprehensive income (loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (481,511) | 119,697 | 216,821
Other comprehensive income (loss) before reclassifications | 132,769 | (622,230) | (96,590)
Less: Amounts reclassified from AOCI | (32,461) | (21,022) | 534
Balance, end of year | (316,281) | (481,511) | 119,697
Net unrealized gains and losses on available-for-sale securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (408,496) | 150,038 | 272,137
Other comprehensive income (loss) before reclassifications | 120,139 | (566,324) | (113,839)
Less: Amounts reclassified from AOCI | (21,409) | (7,790) | 8,260
Balance, end of year | (266,948) | (408,496) | 150,038
Net benefit plan assets and obligations recognized in shareholders' equity |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance, beginning of year | (73,015) | (30,341) | (55,316)
Other comprehensive income (loss) before reclassifications | 12,630 | (55,906) | 17,249
Less: Amounts reclassified from AOCI | (11,052) | (13,232) | (7,726)
Balance, end of year | $ (49,333) | $ (73,015) | $ (30,341)

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