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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

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