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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Pre-tax Amount |  |
Other comprehensive income , Pre-tax Amount | $ 8,770 | $ 37,607
Income Tax Benefit (Expense) |  |
Other comprehensive loss, Income Tax Benefit (Expense) | (2,340) | (10,032)
Net of tax |  |
Balance | 2,486,066 | 2,269,005
Other comprehensive income | 6,430 | 27,575
Balance | 2,513,761 | 2,329,012
Accumulated other comprehensive Income (loss) |  |
Pre-tax Amount |  |
Accumulated other comprehensive loss, beginning balance, Pre-tax Amount | (723,100) | (871,813)
Accumulated other comprehensive loss, ending balance, Pre-tax Amount | (714,330) | (834,206)
Income Tax Benefit (Expense) |  |
Accumulated other comprehensive loss, beginning balance, Income Tax Benefit (Expense) | 192,890 | 232,559
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) | 190,550 | 222,527
Net of tax |  |
Balance | (530,210) | (639,254)
Other comprehensive income | 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 |  |
Pre-tax Amount |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | (3,432) | 25,038
Other comprehensive income , Pre-tax Amount | 7,728 | 36,746
Income Tax Benefit (Expense) |  |
Unrealized net gains (losses) arising during the period, Income Tax Benefit (Expense) | 915 | (6,679)
Other comprehensive loss, Income Tax Benefit (Expense) | (2,061) | (9,802)
Net of tax |  |
Unrealized net gains (losses) arising during the period, Net of tax | (2,517) | 18,359
Other comprehensive income | 5,667 | 26,944
Amortization of unrealized holding losses on held-to-maturity securities |  |
Pre-tax Amount |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | 11,160 | 11,708
Income Tax Benefit (Expense) |  |
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (2,976) | (3,123)
Net of tax |  |
Reclassification of net gains (losses) to net income, Net of tax | 8,184 | 8,585
Cash Flow Derivative Hedges. |  |
Pre-tax Amount |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | (713) | (442)
Reclassification of net losses (gains) to net income, Pre-tax Amount | 1,755 | 1,303
Other comprehensive income , Pre-tax Amount | 1,042 | 861
Income Tax Benefit (Expense) |  |
Unrealized net gains (losses) arising during the period, Income Tax Benefit (Expense) | 189 | 118
Reclassification of net (losses) gains to net income, Income Tax Benefit (Expense) | (468) | (348)
Other comprehensive loss, Income Tax Benefit (Expense) | (279) | (230)
Net of tax |  |
Balance | (803) | (4,702)
Unrealized net gains (losses) arising during the period, Net of tax | (524) | (324)
Reclassification of net gains (losses) to net income, Net of tax | 1,287 | 955
Other comprehensive income | 763 | 631
Balance | (40) | (4,071)
Available-for-sale Investment securities |  |
Net of tax |  |
Balance | (222,423) | (292,175)
Other comprehensive income | (2,517) | 18,359
Balance | $ (224,940) | $ (273,816)

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