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Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net of tax |  |  |  |
Balance | $ 2,513,761 | $ 2,329,012 | $ 2,486,066 | $ 2,269,005
Other comprehensive income (loss) | 4,648 | (1,057) | 11,078 | 26,518
Balance | 2,550,312 | 2,359,738 | 2,550,312 | 2,359,738
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Net of tax |  |  |  |
Balance | (523,780) | (611,679) | (530,210) | (639,254)
Other comprehensive income (loss) | 4,648 | (1,057) | 11,078 | 26,518
Balance | (519,132) | (612,736) | (519,132) | (612,736)
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) | 4,684 | (705) | 10,351 | 26,239
Available-for-sale Investment securities |  |  |  |
Net of tax |  |  |  |
Balance | (224,940) | (273,816) | (222,423) | (292,175)
Other comprehensive income (loss) | (3,136) | (10,284) | (5,653) | 8,075
Balance | (228,076) | (284,100) | (228,076) | (284,100)
Held-to-Maturity Investment Securities |  |  |  |
Net of tax |  |  |  |
Balance | (293,427) | (328,361) | (301,611) | (336,946)
Other comprehensive income (loss) | 7,820 | 9,579 | 16,004 | 18,164
Balance | (285,607) | (318,782) | (285,607) | (318,782)
Cash Flow Derivative Hedges |  |  |  |
Net of tax |  |  |  |
Balance | (40) | (4,071) | (803) | (4,702)
Other comprehensive income (loss) | (36) | (352) | 727 | 279
Balance | $ (76) | $ (4,423) | $ (76) | $ (4,423)

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