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Shareholders' Equity - Change in AOCI Components Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | $ 1,316,995 | $ 1,611,611 | $ 1,374,507
Other Comprehensive Income (Loss) | 37,970 | (368,276) | (74,204)
Balance at End of Period | 1,414,242 | 1,316,995 | 1,611,611
Unrealized Gains and Losses on Net Investment Securities | Available-for-sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | (240,783) | (32,940) | 51,495
Other Comprehensive Income (Loss) Before Reclassifications | 13,031 | (384,543) | (81,644)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity |  | 176,700 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 3,345 |  | (2,791)
Other Comprehensive Income (Loss) | 16,376 | (207,843) | (84,435)
Balance at End of Period | (224,407) | (240,783) | (32,940)
Unrealized Gains and Losses on Net Investment Securities | Held-to-maturity Securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | (168,797) | 54 | (423)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity |  | (176,700) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 19,776 | 7,849 | 477
Other Comprehensive Income (Loss) | 19,776 | (168,851) | 477
Balance at End of Period | (149,021) | (168,797) | 54
Defined Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | (25,078) | (33,496) | (43,250)
Other Comprehensive Income (Loss) Before Reclassifications | 1,447 | 7,000 | 7,968
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 371 | 1,418 | 1,786
Other Comprehensive Income (Loss) | 1,818 | 8,418 | 9,754
Balance at End of Period | (23,260) | (25,078) | (33,496)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | (434,658) | (66,382) | 7,822
Other Comprehensive Income (Loss) Before Reclassifications | 14,478 | (377,543) | (73,676)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 23,492 | 9,267 | (528)
Other Comprehensive Income (Loss) | 37,970 | (368,276) | (74,204)
Balance at End of Period | $ (396,688) | $ (434,658) | $ (66,382)

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