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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income, Gross $ 51,875 $ 56,290
Unrealized holding gains during the period, Gross 65,737 23,977
Amounts reclassified into net income: HTM securities, Gross (72) (261)
Amounts reclassified into net income: Non-credit OTTI, Gross   357
Realized losses (gains) on AFS securities, Gross 2,699 (19,895)
Net unrealized gains, Gross 68,364 4,178
Amount reclassified into net income: Net actuarial loss, Gross 1,516 1,709
Defined pension and other post-retirement benefit plans, Gross 1,516 1,709
Other comprehensive income, Gross 69,880 5,887
Comprehensive income before tax 121,755 62,177
Net income, Tax 14,843 16,582
Unrealized holding gains (losses) during the period, Tax 23,008 8,391
Amounts reclassified into net income: HTM securities, Tax (25) (91)
Amounts reclassified into net income: Non-credit OTTI, Tax   125
Realized losses (gains) on AFS securities, Tax 945 (6,963)
Net unrealized gains, Tax 23,928 1,462
Amount reclassified into net income: Net actuarial loss, Tax 530 598
Defined pension and other post-retirement benefit plans, Tax 530 598
Other comprehensive income, Tax 24,458 2,060
Comprehensive income Tax 39,301 18,642
Net income 37,032 39,708
Unrealized holding gains arising during period 42,729 15,586
Amounts reclassified into net income: HTM Securities (47) (170)
Amounts reclassified into net income: Non-credit OTTI 0 232
Realized losses (gains) on available-for-sale securities 1,754 (12,932)
Total unrealized gains on investment securities 44,436 2,716
Amount reclassified into net income: Net actuarial loss 986 1,111
Total defined benefit pension and post-retirement plans 986 1,111
Other comprehensive income 45,422 3,827
Comprehensive income $ 82,454 $ 43,535