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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive (loss) income | $ (90,486) | $ 104,710
Income tax (expense) benefit | 19,002 | (21,989)
Other comprehensive (loss) income, net of tax | (71,484) | 82,721
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |
Income before tax | 188,239 | 190,936
Income tax (expense) benefit | (38,434) | (38,995)
Net income | 149,805 | 151,941
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | 4,309,234 |
Other comprehensive income before reclassifications | (68,861) |
Less: Amounts reclassified from AOCI | 2,623 |
Balance, end of period | 4,241,828 | 3,816,183
Reclassification from Accumulated Other Comprehensive Income |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |
Income before tax | 3,320 | (4,768)
Income tax (expense) benefit | (697) | 1,002
Net income | 2,623 | (3,766)
Accumulated other comprehensive income (loss) |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other comprehensive (loss) income, net of tax | (71,484) | 82,721
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | 72,708 | (124,214)
Balance, end of period | 1,224 | (41,493)
Net unrealized gains and (losses) on available-for-sale securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive (loss) income | (91,880) | 102,621
Income tax (expense) benefit | 19,295 | (21,550)
Other comprehensive (loss) income, net of tax | (72,585) | 81,071
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | 138,521 |
Other comprehensive income before reclassifications | (68,861) |
Less: Amounts reclassified from AOCI | 3,724 |
Balance, end of period | 65,936 |
Net unrealized gains and (losses) on available-for-sale securities | Reclassification from Accumulated Other Comprehensive Income |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |
Income before tax | 4,714 | (2,679)
Income tax (expense) benefit | (990) | 563
Net income | 3,724 | (2,116)
Net benefit plan assets and (obligations) recognized in shareholders' equity |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total other comprehensive (loss) income | 1,394 | 2,089
Income tax (expense) benefit | (293) | (439)
Other comprehensive (loss) income, net of tax | 1,101 | 1,650
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance, beginning of period | (65,813) |
Other comprehensive income before reclassifications | 0 |
Less: Amounts reclassified from AOCI | (1,101) |
Balance, end of period | (64,712) |
Net benefit plan assets and (obligations) recognized in shareholders' equity | Reclassification from Accumulated Other Comprehensive Income |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |
Income before tax | (1,394) | (2,089)
Income tax (expense) benefit | 293 | 439
Net income | $ (1,101) | $ (1,650)

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