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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