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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net income, Gross | $ 67,130 | $ 67,315 | $ 159,586 | $ 193,818
Unrealized holding (losses) gains during the period, Gross | (21,565) | 16,729 | (130,873) | 78,401
Non-credit portion of OTTI recognized in OCI, Gross |  | 30 |  | 36
Amounts reclassified into net income: HTM securities, Gross | (8) | (54) | (28) | (146)
Amounts reclassified into net income: Non-credit OTTI, Gross |  | 38 |  | 38
Amounts reclassified into net income: Realized losses (gains) on disposals of AFS securities, Gross | 10,839 | (6,760) | 18,258 | (7,135)
Total unrealized (losses) gains on investment securities, Gross | (10,734) | 9,983 | (112,643) | 71,194
Amount reclassified into net income: Net actuarial loss, Gross | 532 | 507 | 1,595 | 1,522
Total defined pension and other post-retirement benefit plans, Gross | 532 | 507 | 1,595 | 1,522
Other comprehensive (loss) income, Gross | (10,202) | 10,490 | (111,048) | 72,716
Comprehensive income before tax | 56,928 | 77,805 | 48,538 | 266,534
Net income, Tax | 11,695 | 20,597 | 26,407 | 55,234
Unrealized holding (losses) gains during the period, Tax | (4,529) | 5,855 | (27,484) | 27,440
Non-credit portion of OTTI recognized in OCI, Tax |  | 11 |  | 13
Amounts reclassified into net income: HTM securities, Tax | (2) | (19) | (6) | (51)
Amounts reclassified into net income: Non-credit OTTI, Tax |  | 13 |  | 13
Amounts reclassified into net income: Realized losses (gains) on disposals of AFS securities, Tax | 2,276 | (2,366) | 3,834 | (2,497)
Total unrealized (losses) gains on investment securities, Tax | (2,255) | 3,494 | (23,656) | 24,918
Amount reclassified into net income: Net actuarial loss, Tax | 112 | 178 | 335 | 533
Total defined pension and other post-retirement benefit plans, Tax | 112 | 178 | 335 | 533
Other comprehensive (loss) income, Tax | (2,143) | 3,672 | (23,321) | 25,451
Comprehensive income, Tax | 9,552 | 24,269 | 3,086 | 80,685
Net income | 55,435 | 46,718 | 133,179 | 138,584
Unrealized holding (losses) gains arising during period | (17,036) | 10,874 | (103,389) | 50,961
Non-credit portion of OTTI recognized in OCI |  | 19 |  | 23
Amounts reclassified into net income: HTM Securities | (6) | (35) | (22) | (95)
Amounts reclassified into net income: Non-credit other than temporary impairments | 0 | 25 | 0 | 25
Amounts reclassified into net income: Realized losses (gains) on disposals of available-for-sale securities | 8,563 | (4,394) | 14,424 | (4,638)
Total unrealized (losses) gains on investment securities | (8,479) | 6,489 | (88,987) | 46,276
Amount reclassified into net income: Net actuarial loss | 420 | 329 | 1,260 | 989
Total defined benefit pension and post-retirement plans | 420 | 329 | 1,260 | 989
Other comprehensive (loss) income | (8,059) | 6,818 | (87,727) | 47,265
Comprehensive income | $ 47,376 | $ 53,536 | $ 45,452 | $ 185,849

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