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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net income, Gross $ 67,574 $ 51,875
Unrealized holding gains during the period, Gross 25,785 65,737
Amounts reclassified into net income: HTM securities, Gross (49) (72)
Amounts reclassified into net income: Realized losses on AFS securities, Gross 1,510 2,699
Total unrealized gains on investment securities, Gross 27,246 68,364
Amount reclassified into net income: Net actuarial loss, Gross 507 1,516
Total defined pension and other post-retirement benefit plans, Gross 507 1,516
Other comprehensive income, Gross 27,753 69,880
Comprehensive income before tax 95,327 121,755
Net income, Tax 17,134 14,843
Unrealized holding gains during the period, Tax 9,024 23,008
Amounts reclassified into net income: HTM securities, Tax (17) (25)
Amounts reclassified into net income: Realized losses on AFS securities, Tax 529 945
Total unrealized gains on investment securities, Tax 9,536 23,928
Amount reclassified into net income: Net actuarial loss, Tax 177 530
Total defined pension and other post-retirement benefit plans, Tax 177 530
Other comprehensive income, Tax 9,713 24,458
Comprehensive income, Tax 26,847 39,301
Net income 50,440 37,032
Unrealized holding gains arising during period 16,761 42,729
Amounts reclassified into net income: HTM Securities (32) (47)
Amounts reclassified into net income: Realized losses on available-for-sale securities 981 1,754
Total unrealized gains on investment securities 17,710 44,436
Amount reclassified into net income: Net actuarial loss 330 986
Total defined benefit pension and post-retirement plans 330 986
Other comprehensive income 18,040 45,422
Comprehensive income $ 68,480 $ 82,454