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Accumulated Other Comprehensive Income (Loss) - Change in AOCI Components Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at Beginning of Period | $ 1,612,849 | $ 1,358,279 | $ 1,414,242 | $ 1,316,995
Total Other Comprehensive Income (Loss) | 39,001 | (18,180) | 61,328 | (6,953)
Balance at End of Period | 1,665,474 | 1,363,840 | 1,665,474 | 1,363,840
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 | (211,600) | (239,803) | (224,407) | (240,783)
Other Comprehensive Income (Loss) Before Reclassifications | 34,271 | (26,596) | 47,078 | (25,616)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 3,345 |  | 3,345
Total Other Comprehensive Income (Loss) | 34,271 | (23,251) | 47,078 | (22,271)
Balance at End of Period | (177,329) | (263,054) | (177,329) | (263,054)
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 | (139,838) | (158,718) | (149,021) | (168,797)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 4,562 | 4,987 | 13,745 | 15,066
Total Other Comprehensive Income (Loss) | 4,562 | 4,987 | 13,745 | 15,066
Balance at End of Period | (135,276) | (153,731) | (135,276) | (153,731)
Defined Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at Beginning of Period | (22,923) | (24,910) | (23,260) | (25,078)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 168 | 84 | 505 | 252
Total Other Comprehensive Income (Loss) | 168 | 84 | 505 | 252
Balance at End of Period | (22,755) | (24,826) | (22,755) | (24,826)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Balance at Beginning of Period | (374,361) | (423,431) | (396,688) | (434,658)
Other Comprehensive Income (Loss) Before Reclassifications | 34,271 | (26,596) | 47,078 | (25,616)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 4,730 | 8,416 | 14,250 | 18,663
Total Other Comprehensive Income (Loss) | 39,001 | (18,180) | 61,328 | (6,953)
Balance at End of Period | $ (335,360) | $ (441,611) | $ (335,360) | $ (441,611)

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