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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive loss | $ (118,045) | $ (90,486)
Income tax (expense) benefit | 24,789 | 19,002
Other comprehensive (loss) income, net of tax | (93,256) | (71,484)
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |
Income tax (expense) benefit | (39,596) | (38,434)
Total reclassifications, net of tax | 150,021 | 149,805
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | 4,698,986 |
Other comprehensive income before reclassifications | (91,016) |
Less: Amounts reclassified from AOCI | 2,240 |
Balance, end of period | 4,732,293 | 4,241,828
Reclassification from Accumulated Other Comprehensive Income |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |
Total reclassifications before tax | 2,835 | 3,320
Income tax (expense) benefit | (595) | (697)
Total reclassifications, net of tax | 2,240 | 2,623
Accumulated other comprehensive income (loss) |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other comprehensive (loss) income, net of tax | (93,256) | (71,484)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | 216,821 | 72,708
Balance, end of period | 123,565 | 1,224
Net unrealized gains and (losses) on available-for-sale securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive loss | (119,150) | (91,880)
Income tax (expense) benefit | 25,021 | 19,295
Other comprehensive (loss) income, net of tax | (94,129) | (72,585)
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | 272,137 |
Other comprehensive income before reclassifications | (91,016) |
Less: Amounts reclassified from AOCI | 3,113 |
Balance, end of period | 178,008 |
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 | 3,940 | 4,714
Income tax (expense) benefit | (827) | (990)
Total reclassifications, net of tax | 3,113 | 3,724
Net benefit plan assets and (obligations) recognized in shareholders' equity |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive loss | 1,105 | 1,394
Income tax (expense) benefit | (232) | (293)
Other comprehensive (loss) income, net of tax | 873 | 1,101
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | (55,316) |
Other comprehensive income before reclassifications | 0 |
Less: Amounts reclassified from AOCI | (873) |
Balance, end of period | (54,443) |
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 | (1,105) | (1,394)
Income tax (expense) benefit | 232 | 293
Total reclassifications, net of tax | $ (873) | $ (1,101)

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