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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