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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, 2012 | Mar. 31, 2011
Comprehensive Income Note[Abstract] |  |
Net income, Gross | $ 23,191 | $ 26,158
Unrealized holding gains (losses) during the period, Gross | 19,804 | (933)
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross | 367 | 180
Amortization of net unrealized gains on HTM securities, Gross | (794) | (1,175)
Reclassification adjustment for gains included in net income, Gross | (4,359) | (5,749)
Net unrealized gains (losses), Gross | 15,018 | (7,677)
Reversal of amortization of net actuarial loss, Gross | 1,390 | 1,105
Reversal of amortization of prior service cost, Gross | 38 | 37
Defined benefit pension plans, Gross | 1,428 | 1,142
Comprehensive income, Gross | 39,637 | 19,623
Net income, Tax | 5,098 | 5,658
Unrealized holding gains (losses) during the period, Tax | 6,931 | (327)
Portion of OTTI recognized in OCI, Tax | 129 | 63
Amortization of net unrealized gains on HTM securities, Tax | (278) | (411)
Reclassification adjustment for gains included in net income, Tax | (1,526) | (2,012)
Net unrealized gains (losses), Tax | 5,256 | (2,687)
Reversal of amortization of net actuarial loss, Tax | 487 | 387
Reversal of amortization of prior service cost, Tax | 13 | 13
Defined benefit pension and post-retirement plans, Tax | 500 | 400
Comprehensive income, Tax | 10,854 | 3,371
Net income | 18,093 | 20,500
Unrealized holding gains (losses) during the period, Net | 12,873 | (606)
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income | 238 | 117
Amortization of net unrealized gains on held-to-maturity securiites | (516) | (764)
Less: reclassification adjustment for gains included in net income | (2,833) | (3,737)
Total unrealized gains (losses) on investment securities | 9,762 | (4,990)
Reversal of amortization of net actuarial loss, Net | 903 | 718
Reversal of amortization of prior service cost, Net | 25 | 24
Total defined benefit pension plans | 928 | 742
Comprehensive income | $ 28,783 | $ 16,252

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