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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income from continuing operations, before federal income tax                 $ 219,955 $ 232,692 $ 197,131
Income Tax Expense (Benefit)                 61,460 66,831 55,304
Net income $ 39,360 $ 38,502 $ 43,601 $ 37,032 $ 45,389 $ 46,996 $ 33,768 $ 39,708 158,495 165,861 141,827
Unrealized holding (losses) gains during the period, Gross                 (9,195) (40,221) 72,940
Unrealized holding (losses) gains during the period, Tax                 (3,218) (14,078) 25,529
Unrealized holding (losses) gains arising during period                 (5,977) (26,143) 47,411
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross                 (10)    
Non-Credit Portion of Other-Than-Temporary Impairment Losses Recognized In Other Comprehensive Income, Tax                 (4)    
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income                 (6)    
Amount reclassified into net income: HTM securities, Gross                 (141) (580) (1,299)
Amortization Of Net Unrealized Gains Losses On Held-to-Maturity Transferred From Available-for-Sale Tax                 (49) (203) (455)
Amount reclassified from AOCI, HTM                 (92) (377) (844)
Non-credit OTTI, Gross                 213 357 1,669
Non-credit OTTI, Tax                 75 125 584
Amounts reclassified into net income: Non-credit other-than-temporary impairment                 138 232 1,085
Realized losses (gains) on AFS securities, Gross                 4,713 (14,016) (28,864)
Realized losses (gains) on AFS securities, Tax                 1,649 (4,906) (10,102)
Realized losses (gains) on available for sale securities                 3,064 (9,110) (18,762)
Net unrealized (losses) gains, Gross                 (4,420) (54,460) 44,446
Net unrealized (losses) gains, Tax                 (1,547) (19,062) 15,556
Total unrealized (losses) gains on investment securities                 (2,873) (35,398) 28,890
Net actuarial (loss) gain, Gross                 (12,079) 2,438 (54,136)
Net actuarial (loss) gain, Tax                 (4,227) 853 (18,947)
Net actuarial (loss) gain                 (7,852) 1,585 (35,189)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax                 6,462 7,077 1,902
Amount reclassified into Net Income: Net actuarial loss, Tax                 2,262 2,477 666
Amount reclassified into net income: Net actuarial loss                 4,200 4,600 1,236
Defined pension and other post-retirement benefit plans, Gross                 (5,617) 9,515 (52,234)
Defined pension and other post-retirement benefit plans, Tax                 (1,965) 3,330 (18,281)
Total defined benefit pension and post-retirement plans                 (3,652) 6,185 (33,953)
Other Comprehensive Loss, Gross                 (10,037) (44,945) (7,788)
Other Comprehensive Loss, Tax                 (3,512) (15,732) (2,725)
Other comprehensive loss (78,159) (9,798) 36,010 45,422 (3,386) 6,290 (35,944) 3,827 (6,525) (29,213) (5,063)
Comprehensive Income, Before Tax                 209,918 187,747 189,343
Comprehensive Income, Tax                 57,948 51,099 52,579
Comprehensive income $ (38,799) $ 28,704 $ 79,611 $ 82,454 $ 42,003 $ 53,286 $ (2,176) $ 43,535 151,970 136,648 136,764
Accumulated Other-than-Temporary Impairment [Member]                      
Other comprehensive loss                 132 232  
Accumulated Defined Benefit Plans Adjustment [Member]                      
Total defined benefit pension and post-retirement plans                 4,200 4,600  
Accumulated other comprehensive income (loss) [Member]                      
Other comprehensive loss                 $ (6,525) $ (29,213) $ (5,063)