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Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss, 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
Net of tax |  |  |  |
Balance | $ 2,550,312 | $ 2,359,738 | $ 2,486,066 | $ 2,269,005
Other comprehensive income (loss) | 66,474 | (35,995) | 77,552 | (9,477)
Balance | 2,648,034 | 2,351,009 | 2,648,034 | 2,351,009
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Net of tax |  |  |  |
Balance | (519,132) | (612,736) | (530,210) | (639,254)
Other comprehensive income (loss) | 66,474 | (35,995) | 77,552 | (9,477)
Balance | (452,658) | (648,731) | (452,658) | (648,731)
Pensions and Other Benefits |  |  |  |
Net of tax |  |  |  |
Balance | (5,373) | (5,431) | (5,373) | (5,431)
Balance | (5,373) | (5,431) | (5,373) | (5,431)
Investment securities |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) | 66,101 | (36,985) | 76,452 | (10,746)
Available-for-sale Investment securities |  |  |  |
Net of tax |  |  |  |
Balance | (228,076) | (284,100) | (222,423) | (292,175)
Other comprehensive income (loss) | 55,893 | (45,369) | 50,240 | (37,294)
Balance | (172,183) | (329,469) | (172,183) | (329,469)
Held-to-Maturity Investment Securities |  |  |  |
Net of tax |  |  |  |
Balance | (285,607) | (318,782) | (301,611) | (336,946)
Other comprehensive income (loss) | 10,208 | 8,384 | 26,212 | 26,548
Balance | (275,399) | (310,398) | (275,399) | (310,398)
Cash Flow Derivative Hedges |  |  |  |
Net of tax |  |  |  |
Balance | (76) | (4,423) | (803) | (4,702)
Other comprehensive income (loss) | 373 | 990 | 1,100 | 1,269
Balance | $ 297 | $ (3,433) | $ 297 | $ (3,433)

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