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Investments (Maturity Information) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Investment securities available for sale      
Total investment securities available for sale, cost $ 4,969,135 $ 4,029,858 $ 3,965,995
Total investment securities available for sale, fair value 5,012,041 4,056,423 3,994,825
Investment securities held to maturity      
Maturing in one through five years, cost 1,354 12 13
Maturing in five through ten years, cost 19 1,699 1,816
Maturing in over ten years, cost 86 111 114
Investment securities held to maturity 1,459 [1] 1,822 [2] 1,943 [1]
Maturing in one through five years, fair value 1,440 11 12
Maturing in five through ten years, fair value 11 1,820 1,940
Maturing in over ten years, fair value 132 149 156
Total investment securities held to maturity, fair value 1,583 1,980 2,108
Debt Securities
     
Investment securities available for sale      
Maturing in one year or less, cost 2,206,157 3,238,657 3,398,267
Maturing in one through five years, cost 2,017,195 548,459 289,046
Maturing in five through ten years, cost 339,863 90,605 106,329
Maturing in over ten years, cost 405,079 151,198 171,414
Maturing in one year or less, fair value 2,207,677 3,241,415 3,401,530
Maturing in one through five years, fair value 2,024,213 549,351 291,064
Maturing in five through ten years, fair value 344,270 91,087 106,901
Maturing in over ten years, fair value 416,825 159,257 179,226
Equity Securities
     
Investment securities available for sale      
Total investment securities available for sale, cost 841 939 939
Total investment securities available for sale, fair value $ 19,056 $ 15,313 $ 16,104
[1] Unaudited
[2] Derived from 2011 Annual Report on Form 10-K.