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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net income, Gross $ 44,485 $ 20,314 $ 109,554 $ 42,813
Net Income, Gross (Including discontinued operations)     108,019  
Unrealized holding gains (losses) during the period, Gross 9,820 36,620 (77,810) 64,273
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross   2,023 77 2,241
HTM securties, Gross (472) (336) (1,803) (1,901)
Realized (gains) losses on AFS securities, Gross (13,516) 1,037 (24,780) (3,451)
Net unrealized gains (losses), Gross (4,167) 39,353 (104,302) 61,434
Amount reclassified into Net Income: Net actuarial loss, Gross 790 1,391 3,419 4,172
Amount reclassified into Net Income: Prior service cost, Gross   38 10 113
Amount reclassified into Net Income: Curtailment expense, Gross     16  
Defined pension and other post-retirement benefit plans, gross 790 1,429 47,445 4,285
Comprehensive income, Gross 41,108 61,096 51,162 108,532
Net income, Tax 11,832 2,040 27,474 6,158
Net Income, tax (Including discontinued operations)     26,936  
Unrealized holding gains (losses) during the period, Tax 3,437 12,817 (27,234) 22,496
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Tax   708 27 784
HTM securities, Tax (165) (117) (631) (665)
Realized (gains) losses on AFS securities, Tax (4,731) 363 (8,673) (1,208)
Net unrealized gains (losses), Tax (1,459) 13,774 (36,506) 21,502
Amount reclassified into Net Income: Net actuarial loss, Tax 277 487 1,197 1,460
Amount reclassified into Net Income: Prior service cost, Tax   14 4 40
Amount reclassified into Net Income: Curtailment expense, tax     5  
Defined pension and other post-retirement benefit plans, tax 277 501 16,606 1,500
Comprehensive income, Tax 10,650 16,315 7,036 29,160
Net income 32,653 18,274 81,083 36,655
Unrealized holding gains (losses) during period 6,383 23,803 (50,576) 41,777
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 0 1,315 50 1,457
HTM Securities (307) (219) (1,172) (1,236)
Realized (gains) losses on available for sale securities (8,785) 674 (16,107) (2,243)
Net unrealized (losses) gains on Investment Securities (2,708) 25,579 (67,796) 39,932
Amount reclassified into Net Income: Net actuarial loss 513 904 2,222 2,712
Amount reclassified into Net Income: Prior service cost 0 24 6 73
Amount reclassified into Net Income: Curtailment expense 0 0 11 0
Total defined benefit pension and post-retirement plans 513 928 30,839 2,785
Comprehensive income 30,458 44,781 44,126 79,372
Accumulated Other-than-Temporary Impairment [Member]
        
Non-credit OTTI, Gross 1 9 14 272
Non-credit OTTI, Tax 0 3 5 95
Amounts reclassified from AOCI 1 6 9 177
Other Comprehensive Income (Loss), Net of Tax     59  
Accumulated other comprehensive income [Member]
        
Other comprehensive loss, Gross (3,377) 40,782 (56,857) 65,719
Other comprehensive income (loss), Tax (1,182) 14,275 (19,900) 23,002
Amounts reclassified from AOCI     (15,031)  
Other Comprehensive Income (Loss), Net of Tax (2,195) 26,507 (36,957) 42,717
Accumulated Defined Benefit Plans Adjustment [Member]
        
Net actuarial gain (loss), Gross     44,000  
Net actuarial gains (losses),Tax     15,400  
Net actuarial gain 0 0 28,600 0
Total defined benefit pension and post-retirement plans     $ 2,239