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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income before federal income tax | $ 101,293 | $ 71,178 | $ 90,225 | $ 73,694 | $ 52,135 | $ 67,130 | $ 72,525 | $ 19,931 | $ 336,390 | $ 211,721 | $ 261,968
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 64,767 | 32,782 | 93,142
Net income | $ 81,859 | $ 56,150 | $ 72,266 | $ 61,348 | $ 45,760 | $ 55,435 | $ 58,819 | $ 18,925 | 271,623 | 178,939 | 168,826
Unrealized holding gains (losses) during the period, Gross |  |  |  |  |  |  |  |  | 212,683 | (123,145) | 66,894
Unrealized holding gains (losses) during the period, Tax |  |  |  |  |  |  |  |  | 44,662 | (25,861) | 23,879
Unrealized holding gains (losses) arising during period, Net |  |  |  |  |  |  |  |  | 168,021 | (97,284) | 43,015
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross |  |  |  |  |  |  |  |  |  |  | 36
Non-Credit Portion of Other-Than-Temporary Impairment Losses Recognized In Other Comprehensive Income, Tax |  |  |  |  |  |  |  |  |  |  | 13
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities |  |  |  |  |  |  |  |  |  |  | (23)
Amount reclassified into net income: HTM securities, Gross |  |  |  |  |  |  |  |  | (58) | 110 | (179)
Amounts reclassified into net income: HTM securities, Tax |  |  |  |  |  |  |  |  | (12) | 23 | (63)
Amount reclassified into net income: HTM securities, Net |  |  |  |  |  |  |  |  | (46) | 87 | (116)
Non-credit OTTI, Gross |  |  |  |  |  |  |  |  |  |  | 104
Non-credit OTTI, Tax |  |  |  |  |  |  |  |  |  |  | 36
Amounts reclassified into net income: Non-credit other-than-temporary impairment |  |  |  |  |  |  |  |  | 0 | 0 | 68
Realized losses (gains) on disposals and OTTI of AFS securities, Gross |  |  |  |  |  |  |  |  | 671 | 39,641 | (6,979)
Realized losses (gains) on disposals and OTTI of AFS securities, Tax |  |  |  |  |  |  |  |  | 141 | 8,325 | (2,442)
Realized losses (gains) on disposals and OTTI of AFS securities |  |  |  |  |  |  |  |  | 530 | 31,316 | (4,537)
Net unrealized gains (losses), Gross |  |  |  |  |  |  |  |  | 213,296 | (83,394) | 59,876
Net unrealized gains (losses), Tax |  |  |  |  |  |  |  |  | 44,791 | (17,513) | 21,423
Total unrealized gains (losses) on investment securities |  |  |  |  |  |  |  |  | 168,505 | (65,881) | 38,453
Net actuarial (loss), Gross |  |  |  |  |  |  |  |  | (13,795) | (11,273) | (4,684)
Net actuarial (loss), Tax |  |  |  |  |  |  |  |  | (2,897) | (2,367) | (984)
Net actuarial (loss), Net |  |  |  |  |  |  |  |  | (10,898) | (8,906) | (3,700)
Amount reclassified into net income: Net actuarial loss, Gross |  |  |  |  |  |  |  |  | 2,657 | 2,127 | 2,102
Amount reclassified into Net Income: Net actuarial loss, Tax |  |  |  |  |  |  |  |  | 558 | 447 | 735
Amount reclassified into net income: Net actuarial loss, Net |  |  |  |  |  |  |  |  | 2,099 | 1,680 | 1,367
Defined pension and other post-retirement benefit plans, Gross |  |  |  |  |  |  |  |  | (11,138) | (9,146) | (2,582)
Defined pension and other post-retirement benefit plans, Tax |  |  |  |  |  |  |  |  | (2,339) | (1,920) | (249)
Total defined benefit pension and post-retirement plans |  |  |  |  |  |  |  |  | (8,799) | (7,226) | (2,333)
Other Comprehensive Income (Loss), Gross |  |  |  |  |  |  |  |  | 202,158 | (92,540) | 57,294
Other Comprehensive Income (Loss), Tax |  |  |  |  |  |  |  |  | 42,452 | (19,433) | 21,174
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 159,706 | (73,107) | 36,120
Comprehensive Income, Before Tax |  |  |  |  |  |  |  |  | 538,548 | 119,181 | 319,262
Comprehensive Income, Tax |  |  |  |  |  |  |  |  | 107,219 | 13,349 | 114,316
Comprehensive income |  |  |  |  |  |  |  |  | $ 431,329 | $ 105,832 | $ 204,946

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