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Accumulated Other Comprehensive Income (Loss) - Changes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pre-tax Amount |  |  |
Other comprehensive income (loss), Pre-tax Amount | $ (209,065) | $ 86,548 | $ 137,465
Income Tax Benefit (Expense) |  |  |
Other comprehensive income (loss), Income Tax Benefit (Expense) | 55,768 | (23,195) | (37,019)
Net of tax |  |  |
Balance | 2,744,104 | 2,640,258 | 2,524,839
Other comprehensive (loss) income | (153,297) | 63,353 | 100,446
Balance | 2,656,912 | 2,744,104 | 2,640,258
Accumulated Other Comprehensive Income (Loss) |  |  |
Pre-tax Amount |  |  |
Accumulated other comprehensive income (loss), beginning balance, Pre-tax Amount | 43,098 | (43,450) | (180,915)
Accumulated other comprehensive (loss) income, ending balance, Pre-tax Amount | (165,967) | 43,098 | (43,450)
Income Tax Benefit (Expense) |  |  |
Accumulated other comprehensive income (loss), beginning balance, Income Tax Benefit (Expense) | (11,494) | 11,701 | 48,720
Accumulated other comprehensive loss, ending balance, Income Tax Benefit (Expense) | 44,274 | (11,494) | 11,701
Net of tax |  |  |
Balance | 31,604 | (31,749) | (132,195)
Other comprehensive (loss) income | (153,297) | 63,353 | 100,446
Balance | (121,693) | 31,604 | (31,749)
Unfunded Pension Liability |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | 10,020 | (4,855) | 407
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | (2,673) | 1,200 | (110)
Net of tax |  |  |
Balance | (31,737) | (28,082) | (28,379)
Unrealized net (losses) gains arising during the period, Net of tax | 7,347 | (3,655) | 297
Other comprehensive (loss) income | 7,347 | (3,655) | 297
Balance | (24,390) | (31,737) | (28,082)
Pension and other benefits, net actuarial losses arising during the period |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | 3,107 | (10,399) | (5,774)
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | (829) | 2,774 | 1,555
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax | 2,278 | (7,625) | (4,219)
Pension and other benefits, prior service credit |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount |  | (51) | (429)
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) |  | 14 | 115
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax |  | (37) | (314)
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 | 6,913 | 5,595 | 6,610
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | (1,844) | (1,492) | (1,780)
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax | 5,069 | 4,103 | 4,830
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) |
Unrealized Loss on Securities |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount |  |  | 137,058
Reclassification of net losses (gains) to net income, Pre-tax Amount |  | 114 | 2,715
Other comprehensive income (loss), Pre-tax Amount | (219,085) | 91,403 |
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) |  |  | (36,909)
Reclassification of net gains (losses) to net income, Income Tax Benefit (Expense) |  | 30 | 731
Other comprehensive income (loss), Income Tax Benefit (Expense) | 58,441 | (24,395) |
Net of tax |  |  |
Balance | 63,341 | (3,667) | (103,816)
Unrealized net (losses) gains arising during the period, Net of tax |  |  | 100,149
Reclassification of net (gains) losses to net income, Net of tax |  | 84 | 1,984
Other comprehensive (loss) income | (160,644) | 67,008 | 100,149
Balance | (97,303) | 63,341 | (3,667)
Investment securities: Unrealized net gains arising during the year |  |  |
Pre-tax Amount |  |  |
Unrealized net gains (losses) arising during the period, Pre-tax Amount | (218,983) | 91,289 | 134,343
Income Tax Benefit (Expense) |  |  |
Unrealized net losses (gains) arising during the period, Income Tax Benefit (Expense) | 58,414 | (24,365) | (36,178)
Net of tax |  |  |
Unrealized net (losses) gains arising during the period, Net of tax | (160,569) | $ 66,924 | $ 98,165
Investment securities: Investment securities losses, net |  |  |
Pre-tax Amount |  |  |
Reclassification of net losses (gains) to net income, Pre-tax Amount | (102) |  |
Income Tax Benefit (Expense) |  |  |
Reclassification of net gains (losses) to net income, Income Tax Benefit (Expense) | (27) |  |
Net of tax |  |  |
Reclassification of net (gains) losses to net income, Net of tax | $ (75) |  |

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