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Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Net of tax |  |
Balance | $ 2,486,066 | $ 2,269,005
Other comprehensive income (loss) | 6,430 | 27,575
Balance | 2,513,761 | 2,329,012
Accumulated other comprehensive Income (loss) |  |
Net of tax |  |
Balance | (530,210) | (639,254)
Other comprehensive income (loss) | 6,430 | 27,575
Balance | (523,780) | (611,679)
Pensions and Other Benefits |  |
Net of tax |  |
Balance | (5,373) | (5,431)
Balance | (5,373) | (5,431)
Investment securities |  |
Net of tax |  |
Other comprehensive income (loss) | 5,667 | 26,944
Available-for-sale Investment securities |  |
Net of tax |  |
Balance | (222,423) | (292,175)
Other comprehensive income (loss) | (2,517) | 18,359
Balance | (224,940) | (273,816)
Held-to-Maturity Investment Securities |  |
Net of tax |  |
Balance | (301,611) | (336,946)
Other comprehensive income (loss) | 8,184 | 8,585
Balance | (293,427) | (328,361)
Cash Flow Derivative Hedges. |  |
Net of tax |  |
Balance | (803) | (4,702)
Other comprehensive income (loss) | 763 | 631
Balance | $ (40) | $ (4,071)

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