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Accumulated Other Comprehensive Income (Loss) - Changes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pre-tax Amount |  |  |
Other comprehensive income (loss), Pre-tax Amount | $ (705,846) | $ (209,065) | $ 86,548
Income Tax Benefit (Expense) |  |  |
Other comprehensive income (loss), Income Tax Benefit (Expense) | 188,285 | 55,768 | (23,195)
Net of tax |  |  |
Balance | 2,656,912 | 2,744,104 | 2,640,258
Other comprehensive (loss) income | (517,561) | (153,297) | 63,353
Balance | 2,269,005 | 2,656,912 | 2,744,104
Accumulated Other Comprehensive Income (Loss) |  |  |
Pre-tax Amount |  |  |
Accumulated other comprehensive income (loss), beginning balance, Pre-tax Amount | (165,967) | 43,098 | (43,450)
Accumulated other comprehensive (loss) income, ending balance, Pre-tax Amount | (871,813) | (165,967) | 43,098
Income Tax Benefit (Expense) |  |  |
Accumulated other comprehensive income (loss), beginning balance, Income Tax Benefit (Expense) | 44,274 | (11,494) | 11,701
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) | 232,559 | 44,274 | (11,494)
Net of tax |  |  |
Balance | (121,693) | 31,604 | (31,749)
Other comprehensive (loss) income | (517,561) | (153,297) | 63,353
Balance | (639,254) | (121,693) | 31,604
Pensions and Other Benefits |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | 25,856 | 10,020 | (4,855)
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | (6,897) | (2,673) | 1,200
Net of tax |  |  |
Balance | (24,390) | (31,737) | (28,082)
Unrealized net (losses) gains arising during the period, Net of tax | 18,959 | 7,347 | (3,655)
Other comprehensive (loss) income | 18,959 | 7,347 | (3,655)
Balance | (5,431) | (24,390) | (31,737)
Pension and other benefits, net actuarial losses arising during the year |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | 20,710 | 3,107 | (10,399)
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | (5,524) | (829) | 2,774
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax | 15,186 | 2,278 | (7,625)
Pension and other benefits, prior service credit |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount |  |  | (51)
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) |  |  | 14
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax |  |  | (37)
Pension and other benefits: Amortization of net loss included in net income |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | 5,146 | 6,913 | 5,595
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | (1,373) | (1,844) | (1,492)
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax | 3,773 | 5,069 | 4,103
Pension and other benefits, change in Company tax rate |  |  |
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) |  |  | (96)
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax |  |  | (96)
Investment Securities |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount |  |  | 91,403
Reclassification of net losses (gains) to net income, Pre-tax Amount |  | (102) | 114
Other comprehensive income (loss), Pre-tax Amount |  | (219,085) |
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) |  |  | (24,395)
Reclassification of net gains (losses) to net income, Income Tax Benefit (Expense) |  | (27) | 30
Other comprehensive income (loss), Income Tax Benefit (Expense) | 193,471 | 58,441 |
Net of tax |  |  |
Balance | (97,303) | 63,341 | (3,667)
Unrealized net (losses) gains arising during the period, Net of tax |  |  | 67,008
Reclassification of net (gains) losses to net income, Net of tax |  | (75) | 84
Other comprehensive (loss) income | (567,291) | (160,644) | 67,008
Balance | (292,175) | (97,303) | 63,341
Investment securities: Unrealized net losses arising during the year |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | (773,667) | (218,983) | 91,289
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | 206,376 | 58,414 | (24,365)
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax | (567,291) | $ (160,569) | $ 66,924
Investment securities: Amortization of unrealized holding losses on held-to-maturity securities |  |  |
Pre-tax Amount |  |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | 48,378 |  |
Income Tax Benefit (Expense) |  |  |
Reclassification of net gains (losses) to net income, Income Tax Benefit (Expense) | (12,905) |  |
Net of tax |  |  |
Reclassification of net (gains) losses to net income, Net of tax | 35,473 |  |
Investment Securities (including reclassification of net losses to net income) |  |  |
Pre-tax Amount |  |  |
Other comprehensive income (loss), Pre-tax Amount | (725,289) |  |
Net of tax |  |  |
Other comprehensive (loss) income | (531,818) |  |
Cash Flow Derivative Hedges |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | (6,710) |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | 297 |  |
Other comprehensive income (loss), Pre-tax Amount | (6,413) |  |
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | 1,790 |  |
Reclassification of net gains (losses) to net income, Income Tax Benefit (Expense) | (79) |  |
Other comprehensive income (loss), Income Tax Benefit (Expense) | 1,711 |  |
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax | (4,920) |  |
Reclassification of net (gains) losses to net income, Net of tax | 218 |  |
Other comprehensive (loss) income | (4,702) |  |
Balance | $ (4,702) |  |

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