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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, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stockholders' Equity and Other Comprehensive Income [Abstract]                      
Net income, Gross                 $ 7,065 $ 76,141 $ 26,253
Unrealized holding gains during the period, Gross                 70,140 44,643 102,514
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross                 1,682 5,256 (8,659)
Amortization of net unrealized gains on HTM securities, Gross                 (3,097) (11,708) 914
Reclassification adjustment for (gains) losses included in net income, Gross                 (1,987) (454) 38,392
Net unrealized gains, Gross                 66,738 37,737 133,161
Net actuarial loss, Gross                 (16,799) (12,045) 2,824
Reversal of amortization of net actuarial loss, Gross                 4,172 4,134 5,274
Reversal of amortization of curtailment benefit, Gross                     (1,387)
Reversal of amortization of prior service cost, Gross                 150 150 (508)
Defined benefit pension plans, Gross                 (12,477) (7,761) 6,203
Comprehensive income, Gross                 61,326 106,117 165,617
Net income, Tax                 (12,800) 10,600 (10,145)
Unrealized holding gains during the period, Tax                 24,548 15,625 35,880
Portion of OTTI recognized in OCI, Tax                 589 1,840 (3,030)
Amortization of net unrealized gains on HTM securities, Tax                 (1,084) (4,098) 320
Reclassification adjustment for (gains) losses included in net income, Tax                 (695) (159) 13,437
Net unrealized gains, Tax                 23,358 13,208 46,607
Net actuarial loss, Tax                 5,880 (4,216) 988
Reversal of amortization of net actuarial loss, Tax                 1,460 1,447 1,846
Reversal of amortization of curtailment benefit, Tax                     (485)
Reversal of amortization of prior service cost, Tax                 53 53 (178)
Defined benefit pension and post-retirement plans, Tax                 (4,367) (2,716) 2,171
Comprehensive income, Tax                 6,191 21,092 38,633
Net income 16,133 (20,142) 2,325 21,549 23,775 17,197 18,766 5,803 19,865 65,541 36,398
Unrealized holding gains during the period, Net                 45,592 29,018 66,634
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax                 1,093 3,416 (5,629)
Amortization of net unrealized gains on HTM securiites, Net                 (2,013) (7,610) 594
Reclassification adjustment for (gains) losses included in net income, Net                 (1,292) (295) 24,955
Net Unrealized gains, Net                 43,380 24,529 86,554
Net actuarial loss, Net                 (10,919) (7,829) 1,836
Reversal of amortization of net actuarial loss, Net                 2,712 2,687 3,428
Reversal of amortization of curtailment benefit, Net                     (902)
Reversal of amortization of prior service cost, Net                 97 97 (330)
Defined benefit pension and post-retirement plans, Net                 (8,110) (5,045) 4,032
Comprehensive income, Net $ 26,263 $ (9,122) $ 20,693 $ 17,301 $ (17,421) $ 47,591 $ 42,365 $ 12,490 $ 55,135 $ 85,025 $ 126,984