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Investments (Maturity Information) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Schedule of Investments [Line Items]   
Total investment securities available for sale, cost$ 3,965,995$ 4,486,881$ 3,745,815
Total investment securities available for sale, fair value3,994,8254,510,0763,786,841
Investment securities held to maturity maturing in one through five years, cost1300
Investment securities held to maturity maturing in five through ten years, cost1,8162,4042,512
Investment securities held to maturity maturing in over ten years, cost114128133
Investment securities held to maturity1,943[1]2,532[2]2,645[1]
Investment securities held to maturity maturing in one through five years, fair value1200
Investment securities held to maturity maturing in five through ten years, fair value1,9402,5702,689
Investment securities held to maturity maturing in over ten years, fair value156171175
Total investment securities held to maturity, fair value2,1082,7412,864
Debt Securities [Member]
   
Schedule of Investments [Line Items]   
Investment securities available for sale maturing in one year or less, cost3,398,2673,441,1852,559,784
Investment securities available for sale maturing in one through five years, cost289,046916,1011,044,757
Investment securities available for sale maturing in five through ten years, cost106,3291,6831,815
Investment securities available for sale maturing in over ten years, cost171,414126,857138,327
Investment securities available for sale maturing in one year or less, fair value3,401,5303,436,8182,567,076
Investment securities available for sale maturing in one through five years, fair value291,064921,5361,056,170
Investment securities available for sale maturing in five through ten years, fair value106,9011,7101,841
Investment securities available for sale maturing in over ten years, fair value179,226130,781142,757
Equity Securities [Member]
   
Schedule of Investments [Line Items]   
Total investment securities available for sale, cost9391,0551,132
Total investment securities available for sale, fair value$ 16,104$ 19,231$ 18,997
[1]Unaudited
[2]Derived from 2010 Annual Report on Form 10-K.