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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
Mar. 31, 2013
Mar. 31, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Net income, Gross $ 27,333 $ 23,191
Unrealized holding gains during the period, Gross 3,684 19,804
Non credit portion of other than temporary impairment losses recognized in other comprehensive income gross 37 367
Amortization of net unrealized gains on HTM securities, Gross (636) (794)
Reclassification adjustment for gains included in net income, Gross (6,057) (4,359)
Net unrealized gains, Gross (2,972) 15,018
Net actuarial gain, gross 44,000  
Reversal of amortization of net actuarial loss, Gross 1,840 1,390
Reversal of amortization of prior service cost 10 38
Curtailment expense 16  
Total recognized in OCI 45,866 1,428
Comprehensive income, Gross 70,227 39,637
Net income, Tax 6,025 5,098
Unrealized holding gains during the period, Tax 1,290 6,931
Portion of OTTI recognized in OCI, Tax 13 129
Amortization of net unrealized gains on HTM securities, Tax (223) (278)
Reclassification adjustments for gains included in net income, tax (2,120) (1,526)
Net unrealized gains, Tax (1,040) 5,256
Net actuarial gains, tax 15,400  
Reversal of amortization of net actuarial loss, Tax 644 487
Reversal of amortization of prior service cost, Tax 4 13
Curtailment expense, tax 5  
Defined pension and other postretirement benefit plans, tax 16,053 500
Comprehensive income, Tax 21,038 10,854
Net income 21,308 18,093
Unrealized holding gains arising during period 2,394 12,873
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income 24 238
Amortization of net unrealized gains on held-to-maturity securiites (413) (516)
Reclassification adjustment for gains included in net income, net of tax (3,937) (2,833)
Total unrealized gains on investment securities (1,932) 9,762
Net actuarial gain 28,600 0
Amortization of net actuarial loss included in net income 1,196 903
Amortization of prior service cost included in net income 6 25
Curtailment expense included in net income 11 0
Defined benefit pension and post-retirement plans 29,813 928
Comprehensive income $ 49,189 $ 28,783