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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net unrealized investment gains (losses) on securities without an allowance for credit losses |  |  |  |  |  |  |  |  | $ 169,135 | $ 220,139 | $ (81,834)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (35,519) | (46,229) | 17,188
Net of taxes |  |  |  |  |  |  |  |  | 133,616 | 173,910 | (64,646)
Net changes in benefit plan assets and obligations |  |  |  |  |  |  |  |  | 13,288 | 29,129 | (19,958)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (2,791) | (6,117) | 4,191
Net of taxes |  |  |  |  |  |  |  |  | 10,497 | 23,012 | (15,767)
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  | 182,423 | 249,268 | (101,792)
Total income tax expense, net |  |  |  |  |  |  |  |  | (38,310) | (52,346) | 21,379
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 144,113 | 196,922 | (80,413)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 559,263 | 847,977 | 844,150
Income tax (expense) benefit | $ (38,782) | $ (33,518) | $ (2,436) | $ (38,434) | $ (45,599) | $ (46,186) | $ (43,433) | $ (38,996) | (113,170) | (174,214) | (174,053)
Net income | 151,430 | $ 130,811 | $ 14,047 | 149,805 | 177,110 | $ 176,934 | $ 167,778 | 151,941 | 446,093 | 673,763 | 670,097
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 4,309,234 |  |  |  | 3,581,891 | 4,309,234 | 3,581,891 |
Balance, end of year | 4,698,986 |  |  |  | 4,309,234 |  |  |  | 4,698,986 | 4,309,234 | 3,581,891
Accumulated other comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  | 144,113 | 196,922 | (80,413)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 72,708 |  |  |  | (124,214) | 72,708 | (124,214) | (43,783)
Cumulative effect of adopting the accounting standard update for financial instruments |  |  |  |  |  |  |  |  |  |  | (18)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | 142,448 | 193,400 | (87,736)
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  | (1,665) | (3,522) | (7,323)
Balance, end of year | 216,821 |  |  |  | 72,708 |  |  |  | 216,821 | 72,708 | (124,214)
Net unrealized gains and losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 138,521 |  |  |  | (35,389) | 138,521 | (35,389) | 29,275
Cumulative effect of adopting the accounting standard update for financial instruments |  |  |  |  |  |  |  |  |  |  | (18)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | 144,566 | 176,784 | (70,206)
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  | 10,950 | 2,874 | (5,560)
Balance, end of year | 272,137 |  |  |  | 138,521 |  |  |  | 272,137 | 138,521 | (35,389)
Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ (65,813) |  |  |  | $ (88,825) | (65,813) | (88,825) | (73,058)
Cumulative effect of adopting the accounting standard update for financial instruments |  |  |  |  |  |  |  |  |  |  | 0
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  | (2,118) | 16,616 | (17,530)
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  | (12,615) | (6,396) | (1,763)
Balance, end of year | $ (55,316) |  |  |  | $ (65,813) |  |  |  | (55,316) | (65,813) | (88,825)
Reclassification from Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | (2,106) | (4,460) | (9,269)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 441 | 938 | 1,946
Net income |  |  |  |  |  |  |  |  | (1,665) | (3,522) | (7,323)
Reclassification from Accumulated Other Comprehensive Income | Net unrealized gains and losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | 13,862 | 3,637 | (7,037)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | (2,912) | (763) | 1,477
Net income |  |  |  |  |  |  |  |  | 10,950 | 2,874 | (5,560)
Reclassification from Accumulated Other Comprehensive Income | Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  | (15,968) | (8,097) | (2,232)
Income tax (expense) benefit |  |  |  |  |  |  |  |  | 3,353 | 1,701 | 469
Net income |  |  |  |  |  |  |  |  | $ (12,615) | $ (6,396) | $ (1,763)

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