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Investments (Maturity Information) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Investment securities available for sale      
Total investment securities available for sale, cost $ 5,247,345 $ 5,192,419 $ 4,434,072
Total investment securities available for sale, fair value 5,279,678 5,226,228 4,457,739
Investment securities held to maturity      
Maturing in one through five years, cost 1,132 1,242 379
Maturing in five through ten years, cost 18 18 1,201
Maturing in over ten years, cost 79 82 108
Investment securities held to maturity 1,229 [1] 1,342 [2] 1,688 [1]
Maturing in one through five years, fair value 1,188 1,309 393
Maturing in five through ten years, fair value 10 11 1,306
Maturing in over ten years, fair value 124 128 145
Total investment securities held to maturity, fair value 1,322 1,448 1,844
Debt Securities
     
Investment securities available for sale      
Maturing in one year or less, cost 2,350,896 2,288,556 2,750,247
Maturing in one through five years, cost 2,233,407 2,323,222 1,469,876
Maturing in five through ten years, cost 181,370 194,398 67,229
Maturing in over ten years, cost 481,129 385,700 145,826
Maturing in one year or less, fair value 2,352,328 2,289,859 2,748,710
Maturing in one through five years, fair value 2,237,530 2,329,207 1,469,236
Maturing in five through ten years, fair value 182,281 196,371 67,683
Maturing in over ten years, fair value 487,136 394,426 153,167
Equity Securities
     
Investment securities available for sale      
Total investment securities available for sale, cost 543 543 894
Total investment securities available for sale, fair value $ 20,403 $ 16,365 $ 18,943
[1] Unaudited
[2] Derived from 2012 Annual Report on Form 10-K.