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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income before federal income tax $ 52,135 $ 67,130 $ 72,525 $ 19,931 $ 68,150 $ 67,315 $ 58,929 $ 67,574 $ 211,721 $ 261,968 $ 219,955
Income Tax Expense (Benefit)                 32,782 93,142 61,460
Net income $ 45,760 [1] $ 55,435 $ 58,819 $ 18,925 $ 30,242 [1] $ 46,718 $ 41,426 $ 50,440 178,939 168,826 158,495
Unrealized holding gains (losses) during the period, Gross                 (123,145) 66,894 (9,195)
Unrealized holding gains (losses) during the period, Tax                 (25,861) 23,879 (3,218)
Unrealized holding gains (losses) arising during period, Net                 (97,284) 43,015 (5,977)
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross                   36 (10)
Non-Credit Portion of Other-Than-Temporary Impairment Losses Recognized In Other Comprehensive Income, Tax                   13 (4)
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income, Net                   23 (6)
Amount reclassified into net income: HTM securities, Gross                 110 (179) (141)
Amounts reclassified into net income: HTM securities, Tax                 23 (63) (49)
Amount reclassified into net income: HTM securities, Net                 87 (116) (92)
Non-credit OTTI, Gross                   104 213
Non-credit OTTI, Tax                   36 75
Amounts reclassified into net income: Non-credit other-than-temporary impairment                 0 68 138
Realized (gains) losses on AFS securities, Gross                 39,641 (6,979) 4,713
Realized (gains) losses on AFS securities, Tax                 8,325 (2,442) 1,649
Realized (gains) losses on available for sale securities                 31,316 (4,537) 3,064
Net unrealized gains (losses), Gross                 (83,394) 59,876 (4,420)
Net unrealized gains (losses), Tax                 (17,513) 21,423 (1,547)
Total unrealized (losses) gains on investment securities                 (65,881) 38,453 (2,873)
Net actuarial (loss) gain, Gross                 (11,273) (4,684) (12,079)
Net actuarial (loss) gain, Tax                 (2,367) (984) (4,227)
Net actuarial (loss) gain, Net                 (8,906) (3,700) (7,852)
Amount reclassified into net i ncome: Net actuarial loss, Gross                 2,127 2,102 6,462
Amount reclassified into Net Income: Net actuarial loss, Tax                 447 735 2,262
Amount reclassified into net income: Net actuarial loss, Net                 1,680 1,367 4,200
Defined pension and other post-retirement benefit plans, Gross                 (9,146) (2,582) (5,617)
Defined pension and other post-retirement benefit plans, Tax                 (1,920) (249) (1,965)
Total defined benefit pension and post-retirement plans                 (7,226) (2,333) (3,652)
Other Comprehensive Income (Loss), Gross                 (92,540) 57,294 (10,037)
Other Comprehensive Income (Loss), Tax                 (19,433) 21,174 (3,512)
Other comprehensive (loss) income                 (73,107) 36,120 (6,525)
Comprehensive Income, Before Tax                 119,181 319,262 209,918
Comprehensive Income, Tax                 13,349 114,316 57,948
Comprehensive income                 $ 105,832 $ 204,946 $ 151,970
[1] Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.