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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