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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

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