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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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net Income, Gross, Including discontinued operations                 $ 142,267   $ 10,400
Net income, Gross                 143,802 37,635 11,400
Net Income, Tax, Including discontinued operations                 35,849   (11,633)
Income Tax Expense (Benefit)                 36,387 (328) (11,283)
Net income 25,335 32,653 27,122 21,308 1,308 18,274 288 18,093 106,418 37,963 22,033
Unrealized holding losses during the period, Gross                 (83,934) 47,594 70,140
Unrealized holding losses during the period, Tax                 (29,377) 16,657 24,548
Unrealized holding losses arising during period                 (54,557) 30,937 45,592
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross                 77 2,554 1,188
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Tax                 27 894 416
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income                 50 1,660 772
Amount reclassified into net income: HTM securities, Gross                 (1,577) (2,432) (2,283)
Amounts reclassified into net income: HTM securities, Tax                 (552) (851) (799)
Amount reclassified into net income: Held-to-maturity securities                 (1,025) (1,581) (1,484)
Realized gains on AFS securities, Gross                 (23,540) (9,412) (2,801)
Realized gains on AFS securities, Tax                 (8,239) (3,294) (980)
Realized gains on available for sale securities                 (15,301) (6,118) (1,821)
Net unrealized gains (losses), Gross                 (108,960) 38,584 66,738
Net unrealized gains (losses), Tax                 (38,136) 13,504 23,358
Total unrealized (losses) gains on investment securities                 (70,824) 25,080 43,380
Amount reclassified into Net Income: Net actuarial loss, Gross                 4,374 5,903 4,172
Amount reclassified into Net Income: Net actuarial loss, Tax                 1,531 2,066 1,460
Amount reclassified into net income: Net actuarial loss                 2,843 3,837 2,712
Amount reclassified into Net Income: Prior service cost, Gross                 10 150 150
Amount reclassified into Net Income: Prior service cost, Tax                 4 53 53
Amount reclassified into net income: Prior service cost                 6 97 97
Amount reclassified into Net Income: Curtailment expense, Gross                 16    
Amount reclassified into Net Income: Curtailment expense, Tax                 5    
Amount reclassified into net income: Curtailment expense                 11 0 0
Defined pension and other post-retirement benefit plans, Gross                 64,054 (20,513) (12,477)
Defined pension and other post-retirement benefit plans, Tax                 22,419 (7,179) (4,367)
Total defined benefit pension and post-retirement plans                 41,635 (13,334) (8,110)
Other comprehensive (loss) income 7,768 (2,195) (62,643) 27,881 (30,971) 26,507 5,520 10,690      
Comprehensive income, Gross                 97,361 55,706 64,661
Comprehensive income, Tax                 20,132 5,997 7,358
Comprehensive income 33,103 30,458 (35,521) 49,189 (29,663) 44,781 5,808 28,783 77,229 49,709 57,303
Accumulated Other-than-Temporary Impairment [Member]
                      
Non-credit OTTI, Gross                 14 280 494
Non-credit OTTI, Tax                 5 98 173
Amounts reclassified into net income: Non-credit other-than-temporary impairment                 9 182 321
Other comprehensive (loss) income                 59 1,842  
Accumulated Defined Benefit Plans Adjustment [Member]
                      
Net actuarial gain (loss), Gross       44,000         59,654 (26,566) (16,799)
Net actuarial gain (loss), Tax                 20,879 (9,298) (5,880)
Net actuarial gain (loss)                 38,775 (17,268) (10,919)
Total defined benefit pension and post-retirement plans                 2,860 3,934  
Accumulated other comprehensive income (loss) [Member]
                      
Amounts reclassified into net income: Non-credit other-than-temporary impairment                 (13,457) (3,583)  
Other Comprehensive (Loss) Income, Gross                 (44,906) 18,071 54,261
Other Comprehensive (Loss) Income, Tax                 (15,717) 6,325 18,991
Other comprehensive (loss) income                 $ (29,189) $ 11,746 $ 35,270