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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net income, Gross $ 67,315 $ 55,443 $ 193,818 $ 169,629
Unrealized holding gains during the period, Gross 16,729 (12,992) 78,401 108,420
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross 30   36 (10)
Amounts reclassified into net income: HTM securities, Gross (54) (13) (146) (104)
Amounts reclassified into net income: Non-Credit OTTI gross 38   38  
Amounts reclassified into net income: Realized gains on AFS securities, Gross (6,760) (3,684) (7,135) (2,747)
Total unrealized gains (losses) on investment securities, Gross 9,983 (16,689) 71,194 105,559
Amount reclassified into net income: Net actuarial loss, Gross 507 1,615 1,522 4,648
Total defined pension and other post-retirement benefit plans, Gross 507 1,615 1,522 4,648
Other comprehensive income (loss), Gross 10,490 (15,074) 72,716 110,207
Comprehensive income before tax 77,805 40,369 266,534 279,836
Net income, Tax 20,597 16,941 55,234 50,494
Unrealized holding gains during the period, Tax 5,855 (4,548) 27,440 37,947
Non-Credit Portion of Other-Than-Temporary Impairment Losses Recognized In Other Comprehensive Income, Tax 11   13 (4)
Amounts reclassified into net income: HTM securities, Tax (19) (4) (51) (36)
Amounts reclassified into net income: Non-Credit OTTI tax 13   13  
Amounts reclassified into net income: Realized gains on AFS securities, Tax (2,366) (1,289) (2,497) (961)
Total unrealized gains (losses) on investment securities, Tax 3,494 (5,841) 24,918 36,946
Amount reclassified into net income: Net actuarial loss, Tax 178 565 533 1,627
Total defined pension and other post-retirement benefit plans, Tax 178 565 533 1,627
Other comprehensive income (loss), Tax 3,672 (5,276) 25,451 38,573
Comprehensive income, Tax 24,269 11,665 80,685 89,067
Net income 46,718 38,502 138,584 119,135
Unrealized holding gains arising during period 10,874 (8,444) 50,961 70,473
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent 19   23 (6)
Amounts reclassified into net income: HTM Securities (35) (9) (95) (68)
Amounts reclassified into net income: Non-credit other-than-temporary impairments 25 0 25 0
Amounts reclassified into net income: Realized gains on available-for-sale securities (4,394) (2,395) (4,638) (1,786)
Total unrealized gains (losses) on investment securities 6,489 (10,848) 46,276 68,613
Amount reclassified into net income: Net actuarial loss 329 1,050 989 3,021
Total defined benefit pension and post-retirement plans 329 1,050 989 3,021
Other comprehensive income (loss) 6,818 (9,798) 47,265 71,634
Comprehensive income $ 53,536 $ 28,704 $ 185,849 $ 190,769