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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