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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
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