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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
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income before federal income tax | $ 68,150 | $ 67,315 | $ 58,929 | $ 67,574 | $ 50,326 | $ 55,443 | $ 62,311 | $ 51,875 | $ 261,968 | $ 219,955 | $ 232,692
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 93,142 | 61,460 | 66,831
Net income | $ 30,242 | $ 46,718 | $ 41,426 | $ 50,440 | $ 39,360 | $ 38,502 | $ 43,601 | $ 37,032 | 168,826 | 158,495 | 165,861
Unrealized holding gains (losses) during the period, Gross |  |  |  |  |  |  |  |  | 66,894 | (9,195) | (40,221)
Unrealized holding gains (losses) during the period, Tax |  |  |  |  |  |  |  |  | 23,879 | (3,218) | (14,078)
Unrealized holding gains (losses) arising during period, Net |  |  |  |  |  |  |  |  | 43,015 | (5,977) | (26,143)
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 |  |  |  |  |  |  |  |  | (179) | (141) | (580)
Amounts reclassified into net income: HTM securities, Tax |  |  |  |  |  |  |  |  | (63) | (49) | (203)
Amount reclassified into net income: HTM securities, Net |  |  |  |  |  |  |  |  | (116) | (92) | (377)
Non-credit OTTI, Gross |  |  |  |  |  |  |  |  | 104 | 213 | 357
Non-credit OTTI, Tax |  |  |  |  |  |  |  |  | 36 | 75 | 125
Amounts reclassified into net income: Non-credit other-than-temporary impairment |  |  |  |  |  |  |  |  | 68 | 138 | 232
Realized (gains) losses on AFS securities, Gross |  |  |  |  |  |  |  |  | (6,979) | 4,713 | (14,016)
Realized (gains) losses on AFS securities, Tax |  |  |  |  |  |  |  |  | (2,442) | 1,649 | (4,906)
Realized (gains) losses on available for sale securities |  |  |  |  |  |  |  |  | (4,537) | 3,064 | (9,110)
Net unrealized gains (losses), Gross |  |  |  |  |  |  |  |  | 59,876 | (4,420) | (54,460)
Net unrealized gains (losses), Tax |  |  |  |  |  |  |  |  | 21,423 | (1,547) | (19,062)
Total unrealized gains (losses) on investment securities |  |  |  |  |  |  |  |  | 38,453 | (2,873) | (35,398)
Net actuarial (loss) gain, Gross |  |  |  |  |  |  |  |  | (4,684) | (12,079) | 2,438
Net actuarial (loss) gain, Tax |  |  |  |  |  |  |  |  | (984) | (4,227) | 853
Net actuarial (loss) gain, Net |  |  |  |  |  |  |  |  | (3,700) | (7,852) | 1,585
Amount reclassified into net i ncome: Net actuarial loss, Gross |  |  |  |  |  |  |  |  | 2,102 | 6,462 | 7,077
Amount reclassified into Net Income: Net actuarial loss, Tax |  |  |  |  |  |  |  |  | 735 | 2,262 | 2,477
Amount reclassified into net income: Net actuarial loss, Net |  |  |  |  |  |  |  |  | 1,367 | 4,200 | 4,600
Defined pension and other post-retirement benefit plans, Gross |  |  |  |  |  |  |  |  | (2,582) | (5,617) | 9,515
Defined pension and other post-retirement benefit plans, Tax |  |  |  |  |  |  |  |  | (249) | (1,965) | 3,330
Total defined benefit pension and post-retirement plans |  |  |  |  |  |  |  |  | (2,333) | (3,652) | 6,185
Other Comprehensive Income (Loss), Gross |  |  |  |  |  |  |  |  | 57,294 | (10,037) | (44,945)
Other Comprehensive Income (Loss), Tax |  |  |  |  |  |  |  |  | 21,174 | (3,512) | (15,732)
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 36,120 | (6,525) | (29,213)
Comprehensive Income, Before Tax |  |  |  |  |  |  |  |  | 319,262 | 209,918 | 187,747
Comprehensive Income, Tax |  |  |  |  |  |  |  |  | 114,316 | 57,948 | 51,099
Comprehensive income |  |  |  |  |  |  |  |  | $ 204,946 | $ 151,970 | $ 136,648

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