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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Net income, Gross | $ 62,311 | $ 46,765 | $ 114,186 | $ 103,055
Unrealized holding gains (losses) during the period, Gross | 55,675 | (60,244) | 121,412 | (36,267)
Non-credit portion of OTTI recognized in OCI, Gross | (10) |  | (10) |
Amounts reclassified into net income: HTM securities, Gross | (19) | (185) | (91) | (446)
Amounts reclassified into net income: Non-credit OTTI, Gross |  |  |  | 357
Realized (gains) losses on AFS securities, Gross | (1,762) | 3,422 | 937 | (16,473)
Total unrealized gains (losses) on investment securities, Gross | 53,884 | (57,007) | 122,248 | (52,829)
Amount reclassified into net income: Net actuarial loss, Gross | 1,517 | 1,709 | 3,033 | 3,418
Total defined pension and other post-retirement benefit plans, Gross | 1,517 | 1,709 | 3,033 | 3,418
Other comprehensive income (loss), Gross | 55,401 | (55,298) | 125,281 | (49,411)
Comprehensive income (loss) before tax | 117,712 | (8,533) | 239,467 | 53,644
Net income, Tax | 18,710 | 12,997 | 33,553 | 29,579
Unrealized holding gains (losses) during the period, Tax | 19,487 | (21,084) | 42,495 | (12,693)
Non-credit portion of OTTI recognized in OCI, Tax | (4) |  | (4) |
Amounts reclassified into net income: HTM securities, Tax | (7) | (65) | (32) | (156)
Amounts reclassified into net income: Non-credit OTTI, Tax |  |  |  | 125
Realized (gains) losses on AFS securities, Tax | (617) | 1,197 | 328 | (5,766)
Total unrealized gains (losses) on investment securities, Tax | 18,859 | (19,952) | 42,787 | (18,490)
Amount reclassified into net income: Net actuarial loss, Tax | 532 | 598 | 1,062 | 1,196
Total defined pension and other post-retirement benefit plans, Tax | 532 | 598 | 1,062 | 1,196
Other comprehensive income (loss), Tax | 19,391 | (19,354) | 43,849 | (17,294)
Comprehensive income (loss), Tax | 38,101 | (6,357) | 77,402 | 12,285
Net income | 43,601 | 33,768 | 80,633 | 73,476
Unrealized holding gains (losses) arising during period | 36,188 | (39,160) | 78,917 | (23,574)
Non-credit portion of OTTI recognized in OCI | (6) |  | (6) |
Amounts reclassified into net income: HTM Securities | (12) | (120) | (59) | (290)
Amounts reclassified into net income: Non-credit OTTI | 0 | 0 | 0 | 232
Realized (gains) losses on available-for-sale securities | (1,145) | 2,225 | 609 | (10,707)
Total unrealized gains (losses) on investment securities | 35,025 | (37,055) | 79,461 | (34,339)
Amount reclassified into net income: Net actuarial loss | 985 | 1,111 | 1,971 | 2,222
Total defined benefit pension and post-retirement plans | 985 | 1,111 | 1,971 | 2,222
Other comprehensive income (loss) | 36,010 | (35,944) | 81,432 | (32,117)
Comprehensive income (loss) | $ 79,611 | $ (2,176) | $ 162,065 | $ 41,359

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