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Shareholders' Equity - Change in AOCI Components Net of Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | $ 1,414,242 | $ 1,316,995 | $ 1,611,611
Other Comprehensive Income (Loss) | 53,299 | 37,970 | (368,276)
Balance at End of Period | 1,667,774 | 1,414,242 | 1,316,995
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 | (224,407) | (240,783) | (32,940)
Other Comprehensive Income (Loss) Before Reclassifications | 35,177 | 13,031 | (384,543)
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 |
Other Comprehensive Income (Loss) | 35,177 | 16,376 | (207,843)
Balance at End of Period | (189,230) | (224,407) | (240,783)
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 | (149,021) | (168,797) | 54
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) | 18,258 | 19,776 | 7,849
Other Comprehensive Income (Loss) | 18,258 | 19,776 | (168,851)
Balance at End of Period | (130,763) | (149,021) | (168,797)
Defined Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | (23,260) | (25,078) | (33,496)
Other Comprehensive Income (Loss) Before Reclassifications | (810) | 1,447 | 7,000
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 674 | 371 | 1,418
Other Comprehensive Income (Loss) | (136) | 1,818 | 8,418
Balance at End of Period | (23,396) | (23,260) | (25,078)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at Beginning of Period | (396,688) | (434,658) | (66,382)
Other Comprehensive Income (Loss) Before Reclassifications | 34,367 | 14,478 | (377,543)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 18,932 | 23,492 | 9,267
Other Comprehensive Income (Loss) | 53,299 | 37,970 | (368,276)
Balance at End of Period | $ (343,389) | $ (396,688) | $ (434,658)

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