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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income (loss), Gross $ 20,314 $ (38,483) $ 42,813 $ (12,424)
Unrealized holding gains during the period, Gross 36,620 14,712 64,273 43,878
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross 2,031 (81) 2,512 517
Amortization of net unrealized gains on HTM securities, Gross 827 (664) (649) (3,097)
Reclassification adjustment for gains included in net income, Gross (125) 1,907 (4,702) (5,986)
Net unrealized gains, Gross 39,353 15,874 61,434 35,312
Reversal of amortization of net actuarial loss, Gross 1,391 1,043 4,172 3,252
Reversal of amortization of prior service cost, Gross 38 38 113 113
Defined benefit plans, Gross 1,429 1,081 4,285 3,365
Comprehensive income (loss), Gross 61,096 (21,528) 108,532 26,253
Net income (loss), Tax 2,040 (20,515) 6,158 (16,423)
Unrealized holding gains during the period, Tax 12,817 5,148 22,496 15,357
Portion of OTTI recognized in OCI, Tax 711 (28) 879 181
Amortization of net unrealized gains on HTM securities, Tax 290 (232) (227) (1,084)
Reclassification adjustment for gains included in net income, Tax (44) 668 (1,646) (2,095)
Net unrealized gains, Tax 13,774 5,556 21,502 12,359
Reversal of amortization of net actuarial loss, Tax 487 365 1,460 1,138
Reversal of amortization of prior service cost, Tax 14 14 40 40
Defined benefit pension and post-retirement plans, Tax 501 379 1,500 1,178
Comprehensive income (loss), Tax 16,315 (14,580) 29,160 (2,886)
Net income (loss) 18,274 (17,968) 36,655 3,999
Unrealized holding gains arising during the period 23,803 9,564 41,777 28,521
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 1,320 (53) 1,633 336
Amortization of net unrealized gains on held-to-maturity securiites 537 (432) (422) (2,013)
Less: reclassification adjustment for gains included in net income (81) 1,239 (3,056) (3,891)
Total unrealized gains on investment securities 25,579 10,318 39,932 22,953
Amortization of net actuarial loss included in net income 904 678 2,712 2,114
Amortization of prior service cost included in net income 24 24 73 73
Total defined benefit pension plans 928 702 2,785 2,187
Comprehensive income (loss) $ 44,781 $ (6,948) $ 79,372 $ 29,139