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Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income | $ 182,517 | $ 91,523 | $ 92,031 | $ 196,233
Income tax (expense) benefit | (38,329) | (19,220) | (19,327) | (41,209)
Other comprehensive (loss) income, net of tax | 144,188 | 72,303 | 72,704 | 155,024
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Income before tax | 16,483 | 211,211 | 204,722 | 402,147
Income tax (expense) benefit | (2,436) | (43,433) | (40,870) | (82,428)
Net income | 14,047 | 167,778 | 163,852 | 319,719
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 4,309,234 |
Other comprehensive income before reclassifications |  |  | 69,272 |
Less: Amounts reclassified from AOCI |  |  | (3,432) |
Balance, end of period | 4,383,355 | 4,035,665 | 4,383,355 | 4,035,665
Reclassification from Accumulated Other Comprehensive Income |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Income before tax | (7,665) | (260) | (4,345) | (5,028)
Income tax (expense) benefit | 1,610 | 55 | 913 | 1,057
Net income | (6,055) | (205) | (3,432) | (3,971)
Accumulated other comprehensive income (loss) |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other comprehensive (loss) income, net of tax | 144,188 | 72,303 | 72,704 | 155,024
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period | 1,224 | (41,493) | 72,708 | (124,214)
Balance, end of period | 145,412 | 30,810 | 145,412 | 30,810
Net unrealized gains and (losses) on available-for-sale securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income | 181,242 | 89,562 | 89,362 | 192,183
Income tax (expense) benefit | (38,061) | (18,808) | (18,766) | (40,358)
Other comprehensive (loss) income, net of tax | 143,181 | 70,754 | 70,596 | 151,825
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 138,521 |
Other comprehensive income before reclassifications |  |  | 69,272 |
Less: Amounts reclassified from AOCI |  |  | (1,324) |
Balance, end of period | 209,117 |  | 209,117 |
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 | (6,390) | 1,701 | (1,676) | (978)
Income tax (expense) benefit | 1,342 | (357) | 352 | 206
Net income | (5,048) | 1,344 | (1,324) | (772)
Net benefit plan assets and (obligations) recognized in shareholders' equity |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total other comprehensive income | 1,275 | 1,961 | 2,669 | 4,050
Income tax (expense) benefit | (268) | (412) | (561) | (851)
Other comprehensive (loss) income, net of tax | 1,007 | 1,549 | 2,108 | 3,199
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 |  |  | (2,108) |
Balance, end of period | (63,705) |  | (63,705) |
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 | (1,275) | (1,961) | (2,669) | (4,050)
Income tax (expense) benefit | 268 | 412 | 561 | 851
Net income | $ (1,007) | $ (1,549) | $ (2,108) | $ (3,199)

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