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Stockholders' Equity and Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income, Gross |  |  |  |  |  |  |  |  | $ 37,635 | $ 10,400 | $ 78,334
Unrealized holding gains during the period, Gross |  |  |  |  |  |  |  |  | 47,594 | 70,140 | 44,643
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross |  |  |  |  |  |  |  |  | 2,834 | 1,682 | 5,256
Amortization of net unrealized gains on HTM securities, Gross |  |  |  |  |  |  |  |  | (1,303) | (3,097) | (11,708)
Reclassification adjustment for gains losses included in net income, Gross |  |  |  |  |  |  |  |  | (10,541) | (1,987) | (454)
Net unrealized gains, Gross |  |  |  |  |  |  |  |  | 38,584 | 66,738 | 37,737
Net actuarial loss |  |  |  |  |  |  |  |  | (26,566) | (16,799) | (12,045)
Reversal of amortization of net actuarial loss, Gross |  |  |  |  |  |  |  |  | 5,903 | 4,172 | 4,134
Reversal of amortization of prior service cost, Gross |  |  |  |  |  |  |  |  | 150 | 150 | 150
Defined benefit pension plans and postretirement plans, Gross |  |  |  |  |  |  |  |  | (20,513) | (12,477) | (7,761)
Comprehensive income, Gross |  |  |  |  |  |  |  |  | 55,706 | 64,661 | 108,310
Net income (loss), Tax |  |  |  |  |  |  |  |  | (328) | (11,633) | 11,368
Unrealized holding gains during the period, Tax |  |  |  |  |  |  |  |  | 16,657 | 24,548 | 15,625
Portion of OTTI recognized in OCI, Tax |  |  |  |  |  |  |  |  | 992 | 589 | 1,840
Amortization of net unrealized gains on HTM securities, Tax |  |  |  |  |  |  |  |  | (456) | (1,084) | (4,098)
Reclassification adjustment for gains losses included in net income, Tax |  |  |  |  |  |  |  |  | (3,689) | (695) | (159)
Net unrealized gains, Tax |  |  |  |  |  |  |  |  | 13,504 | 23,358 | 13,208
Net actuarial loss, Tax |  |  |  |  |  |  |  |  | (9,298) | (5,880) | (4,216)
Reversal of amortization of net actuarial loss, Tax |  |  |  |  |  |  |  |  | 2,066 | 1,460 | 1,447
Reversal of amortization of prior service cost, Tax |  |  |  |  |  |  |  |  | 53 | 53 | 53
Defined benefit pension and post-retirement plans, Tax |  |  |  |  |  |  |  |  | (7,179) | (4,367) | (2,716)
Comprehensive income, Tax |  |  |  |  |  |  |  |  | 5,997 | 7,358 | 21,860
Net income | 1,308 | 18,274 | 288 | 18,093 | 18,034 | (17,968) | 1,467 | 20,500 | 37,963 | 22,033 | 66,966
Unrealized holding gains during the period, net |  |  |  |  |  |  |  |  | 30,937 | 45,592 | 29,018
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income,net |  |  |  |  |  |  |  |  | 1,842 | 1,093 | 3,416
Amortization of net unrealized gains on held-to-maturity securiites, Net |  |  |  |  |  |  |  |  | (847) | (2,013) | (7,610)
Reclassification adjustment for gains included in net income, net |  |  |  |  |  |  |  |  | (6,852) | (1,292) | (295)
Total unrealized gains on investment securities |  |  |  |  |  |  |  |  | 25,080 | 43,380 | 24,529
Net actuarial loss, net |  |  |  |  |  |  |  |  | (17,268) | (10,919) | (7,829)
Amortization of net actuarial loss included in net income, net |  |  |  |  |  |  |  |  | 3,837 | 2,712 | 2,687
Amortization of prior service cost included in net income, net |  |  |  |  |  |  |  |  | 97 | 97 | 97
Total defined benefit pension and post retirement plans, net |  |  |  |  |  |  |  |  | (13,334) | (8,110) | (5,045)
Comprehensive income | $ (29,663) | $ 44,781 | $ 5,808 | $ 28,783 | $ 28,164 | $ (6,948) | $ 19,835 | $ 16,252 | $ 49,709 | $ 57,303 | $ 86,450

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