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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income (loss) | $ (221,380) | $ 57,869 | $ (563,842) | $ (60,176)
Income tax benefit (expense) | 46,490 | (12,152) | 118,407 | 12,637
Other comprehensive income (loss), net of tax | (174,890) | 45,717 | (445,435) | (47,539)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Total reclassifications before tax | 315,891 | 193,868 | 535,330 | 383,485
Income tax benefit (expense) | (66,623) | (40,817) | (111,049) | (80,413)
Total reclassifications, net of tax | 249,268 | 153,051 | 424,281 | 303,072
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 4,861,382 |
Other comprehensive income (loss) before reclassifications |  |  | (444,416) |
Less: Amounts reclassified from AOCI |  |  | 1,019 |
Balance, end of period | 4,573,019 | 4,914,707 | 4,573,019 | 4,914,707
Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Total reclassifications before tax | (3,053) | 1,638 | 1,290 | 4,473
Income tax benefit (expense) | 641 | (344) | (271) | (939)
Total reclassifications, net of tax | (2,412) | 1,294 | 1,019 | 3,534
Accumulated other comprehensive income (loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive income (loss), net of tax | (174,890) | 45,717 | (445,435) | (47,539)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period | (150,848) | 123,565 | 119,697 | 216,821
Balance, end of period | (325,738) | 169,282 | (325,738) | 169,282
Net unrealized gains and (losses) on available-for-sale securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income (loss) | (222,000) | 57,030 | (564,960) | (62,120)
Income tax benefit (expense) | 46,620 | (11,976) | 118,642 | 13,045
Other comprehensive income (loss), net of tax | (175,380) | 45,054 | (446,318) | (49,075)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 150,038 |
Other comprehensive income (loss) before reclassifications |  |  | (444,416) |
Less: Amounts reclassified from AOCI |  |  | 1,902 |
Balance, end of period | (296,280) |  | (296,280) |
Net unrealized gains and (losses) on available-for-sale securities | Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Total reclassifications before tax | (2,433) | 2,477 | 2,408 | 6,417
Income tax benefit (expense) | 511 | (520) | (506) | (1,347)
Total reclassifications, net of tax | (1,922) | 1,957 | 1,902 | 5,070
Net benefit plan assets and (obligations) recognized in shareholders' equity |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income (loss) | 620 | 839 | 1,118 | 1,944
Income tax benefit (expense) | (130) | (176) | (235) | (408)
Other comprehensive income (loss), net of tax | 490 | 663 | 883 | 1,536
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | (30,341) |
Other comprehensive income (loss) before reclassifications |  |  | 0 |
Less: Amounts reclassified from AOCI |  |  | (883) |
Balance, end of period | (29,458) |  | (29,458) |
Net benefit plan assets and (obligations) recognized in shareholders' equity | Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Total reclassifications before tax | (620) | (839) | (1,118) | (1,944)
Income tax benefit (expense) | 130 | 176 | 235 | 408
Total reclassifications, net of tax | $ (490) | $ (663) | $ (883) | $ (1,536)

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