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Investments (Maturity Information) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Investment securities available for sale      
Total investment securities available for sale, cost $ 4,606,093 $ 4,029,858 $ 3,982,402
Total investment securities available for sale, fair value 4,634,248 4,056,423 4,014,241
Investment securities held to maturity      
Maturing in one through five years, cost 1,470 12 8
Maturing in five through ten years, cost 4 1,699 1,973
Maturing in over ten years, cost 104 111 117
Investment securities held to maturity 1,578 [1] 1,822 [2] 2,098 [1]
Maturing in one through five years, fair value 1,568 11 6
Maturing in five through ten years, fair value 4 1,820 2,110
Maturing in over ten years, fair value 142 149 162
Total investment securities held to maturity, fair value 1,714 1,980 2,278
Debt Securities
     
Investment securities available for sale      
Maturing in one year or less, cost 2,424,304 3,238,657 3,133,235
Maturing in one through five years, cost 1,953,001 548,459 549,912
Maturing in five through ten years, cost 71,914 90,605 99,834
Maturing in over ten years, cost 156,033 151,198 198,456
Maturing in one year or less, fair value 2,425,612 3,241,415 3,140,002
Maturing in one through five years, fair value 1,954,357 549,351 551,647
Maturing in five through ten years, fair value 72,533 91,087 100,387
Maturing in over ten years, fair value 163,508 159,257 203,596
Equity Securities
     
Investment securities available for sale      
Total investment securities available for sale, cost 841 939 965
Total investment securities available for sale, fair value $ 18,238 $ 15,313 $ 18,609
[1] Unaudited
[2] Derived from 2011 Annual Report on Form 10-K.