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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |  |
Net income, Gross | $ 36,201 | $ (692) | $ 63,534 | $ 22,499
Unrealized holding gains during the period, Gross | (91,314) | 7,849 | (87,630) | 27,653
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross | 47 | 54 | 77 | 218
Held-to-maturity, Gross | (614) | (701) | (1,331) | (1,565)
Non-credit OTTI, Gross | 6 | 60 | 13 | 263
Realized gains on AFS securities, Gross | (5,288) | (199) | (11,264) | (4,488)
Net unrealized gains (losses), Gross | (97,163) | 7,063 | (100,135) | 22,081
Net actuarial gain (loss), Gross |  |  | 44,000 |
Amount reclassified into Net Income: Net actuarial loss, Gross | 789 | 1,391 | 2,629 | 2,781
Amount reclassified into Net Income: Prior service cost, Gross |  | 37 | 10 | 75
Amount reclassified into Net Income: Curtailment expense, Gross |  |  | 16 |
Pension and other post-retirement benefit plans, gross | 789 | 1,428 | 46,655 | 2,856
Other comprehensive loss, Gross | (96,374) | 8,491 | (53,480) | 24,937
Comprehensive income, Gross | (60,173) | 7,799 | 10,054 | 47,436
Net income, Tax | 9,079 | (980) | 15,104 | 4,118
Unrealized holding gains during the period, Tax | (31,961) | 2,748 | (30,671) | 9,679
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Tax | (16) | (19) | (27) | (76)
HTM securities, Tax | (215) | (245) | (466) | (548)
Non-credit OTTI, Tax | 3 | 21 | 5 | 92
Realized gains on AFS securities, Tax | (1,850) | (71) | (3,942) | (1,571)
Net unrealized gains (losses), Tax | (34,007) | 2,472 | (35,047) | 7,728
Net actuarial gains (losses),Tax |  |  | 15,400 |
Amount reclassified into Net Income: Net actuarial loss, Tax | 276 | 486 | 920 | 973
Amount reclassified into Net Income: Prior service cost, Tax |  | 13 | 4 | 26
Amount reclassified into Net Income: Curtailment expense, tax |  |  | 5 |
Defined pension and other postretirement benefit plans, tax | 276 | 499 | 16,329 | 999
Other comprehensive income (loss), Tax | (33,731) | 2,971 | (18,718) | 8,727
Comprehensive income, Tax | (24,652) | 1,991 | (3,614) | 12,845
Net income | 27,122 | 288 | 48,430 | 18,381
Unrealized holding (losses) gains arising during period | (59,353) | 5,101 | (56,959) | 17,974
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income | 31 | 35 | 50 | 142
Amounts reclassified into Net Income: Held-to-maturity securities | (399) | (456) | (865) | (1,017)
Amounts reclassed into Net Income: Non-credit other-than-temporary impairment | 3 | 39 | 8 | 171
Amount reclassed into Net Income: Realized gains on available for sale securities | (3,438) | (128) | (7,322) | (2,917)
Total unrealized gains on investment securities | (63,156) | 4,591 | (65,088) | 14,353
Net actuarial gain | 0 | 0 | 28,600 | 0
Amount reclassified into Net Income: Net actuarial loss | (513) | (905) | (1,709) | (1,808)
Amount reclassified into Net Income: Prior service cost | 0 | 24 | 6 | 49
Amount reclassified into Net Income: Curtailment expense | 0 | 0 | 11 | 0
Defined benefit pension and post-retirement plans | 513 | 929 | 30,326 | 1,857
Other Comprehensive Income (Loss), Net of Tax | (62,643) | 5,520 | (34,762) | 16,210
Comprehensive (loss) income | $ (35,521) | $ 5,808 | $ 13,668 | $ 34,591

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