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Investments (Maturity Information) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Schedule of Investments [Line Items]      
Total investment securities available for sale, cost $ 4,434,072 $ 4,029,858 $ 4,188,164
Total investment securities available for sale, fair value 4,457,739 4,056,423 4,202,016
Investment securities held to maturity maturing in one through five years, cost 379 12 5
Investment securities held to maturity maturing in five through ten years, cost 1,201 1,699 2,214
Investment securities held to maturity maturing in over ten years, cost 108 111 122
Investment securities held to maturity 1,688 [1] 1,822 [2] 2,341 [1]
Investment securities held to maturity maturing in one through five years, fair value 393 11 3
Investment securities held to maturity maturing in five through ten years, fair value 1,306 1,820 2,368
Investment securities held to maturity maturing in over ten years, fair value 145 149 166
Total investment securities held to maturity, fair value 1,844 1,980 2,537
Debt Securities [Member]
     
Schedule of Investments [Line Items]      
Investment securities available for sale maturing in one year or less, cost 2,750,247 3,238,657 2,966,749
Investment securities available for sale maturing in one through five years, cost 1,469,876 548,459 895,234
Investment securities available for sale maturing in five through ten years, cost 67,229 90,605 21,099
Investment securities available for sale maturing in over ten years, cost 145,826 151,198 304,117
Investment securities available for sale maturing in one year or less, fair value 2,748,710 3,241,415 2,958,654
Investment securities available for sale maturing in one through five years, fair value 1,469,236 549,351 895,807
Investment securities available for sale maturing in five through ten years, fair value 67,683 91,087 21,099
Investment securities available for sale maturing in over ten years, fair value 153,167 159,257 306,835
Equity Securities [Member]
     
Schedule of Investments [Line Items]      
Total investment securities available for sale, cost 894 939 965
Total investment securities available for sale, fair value $ 18,943 $ 15,313 $ 19,621
[1] Unaudited
[2] Derived from 2011 Annual Report on Form 10-K.