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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Net income, Gross | $ 75,326 | $ 44,485 | $ 139,931 | $ 108,019
Unrealized holding gains during the period, Gross | (13,831) | 9,820 | 64,255 | (77,810)
Non-credit OTTI recognized in OCI, Gross |  |  |  | 77
Amounts reclassified into net income: HTM securities, Gross | (373) | (472) | (1,050) | (1,803)
Amounts reclassified into net income: non-credit OTTI | 1,200 | 1 | 1,669 | 14
Realized gains on AFS securities, Gross | (16,435) | (13,516) | (28,672) | (24,780)
Net unrealized (losses) gains, Gross | (29,439) | (4,167) | 36,202 | (104,302)
Net actuarial gain, Gross |  |  |  | 44,000
Amount reclassified into Net Income: Net actuarial loss, Gross | 381 | 790 | 1,142 | 3,419
Amount reclassified into Net Income: Prior service cost, Gross |  |  |  | 10
Amount reclassified into Net Income: Curtailment expense |  |  |  | 16
Defined pension and other post-retirement benefit plans, gross | 381 | 790 | 1,142 | 47,445
Other comprehensive (loss) income, Gross | (29,058) | (3,377) | 37,344 | (56,857)
Comprehensive income (loss), Gross | 46,268 | 41,108 | 177,275 | 51,162
Net income, Tax | 22,164 | 11,832 | 39,454 | 26,936
Unrealized holding (losses) gains during the period, Tax | (4,843) | 3,437 | 22,488 | (27,234)
Non-credit OTTI recognized in OCI, Tax |  |  |  | 27
HTM securities, Tax | (130) | (165) | (367) | (631)
Non-credit OTTI, Tax | 420 | 0 | 584 | 5
Realized gains on AFS securities, Tax | (5,752) | (4,731) | (10,035) | (8,673)
Net unrealized gains (losses), Tax | (10,305) | (1,459) | 12,670 | (36,506)
Net actuarial gain, Tax |  |  |  | 15,400
Amount reclassified into Net Income: Net actuarial loss, Tax | 134 | 277 | 400 | 1,197
Amount reclassified into Net Income: Prior service cost, Tax |  |  |  | 4
Amount reclassified into Net Income: Curtailment expense, tax |  |  |  | 5
Defined pension and other post-retirement benefit plans, tax | 134 | 277 | 400 | 16,606
Other comprehensive income (loss), Tax | (10,171) | (1,182) | 13,070 | (19,900)
Comprehensive income (loss), Tax | 11,993 | 10,650 | 52,524 | 7,036
Net income | 53,162 | 32,653 | 100,477 | 81,083
Unrealized holding gains (losses) arising during period | (8,988) | 6,383 | 41,767 | (50,576)
Non-credit OTTI recognized in OCI | 0 | 0 | 0 | 50
HTM Securities | (243) | (307) | (683) | (1,172)
Amounts reclassified into Net Income: Non-credit other-than-temporary impairments | 780 | 1 | 1,085 | 9
Realized gains on available for sale securities | (10,683) | (8,785) | (18,637) | (16,107)
Total unrealized (losses) gains on investment securities | (19,134) | (2,708) | 23,532 | (67,796)
Net actuarial gain | 0 | 0 | 0 | 28,600
Amount reclassified into Net Income: Net actuarial loss | 247 | 513 | 742 | 2,222
Amount reclassified into Net Income: Prior service cost | 0 | 0 | 0 | 6
Other Comprehensive Income Loss Amortization Pension And Other Post Retirement Benefit Plans Curtailment Expense Recognized In Net Periodic Benefit Cost Net of Tax | 0 | 0 | 0 | 11
Total defined benefit pension and post-retirement plans | 247 | 513 | 742 | 30,839
Other comprehensive (loss) income | (18,887) | (2,195) | 24,274 | (36,957)
Comprehensive income | $ 34,275 | $ 30,458 | $ 124,751 | $ 44,126

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