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Investments (Aggregate Values And Unrealized Gains And Losses) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Schedule of Investments [Line Items]      
Investment securities available for sale, cost $ 4,434,072 $ 4,029,858 $ 4,188,164
Investment securities available for sale, gross unrealized gains 29,204 28,454 32,016
Investment securities available for sale, gross unrealized losses 5,537 1,889 18,164
Total investment securities available for sale, fair value 4,457,739 4,056,423 4,202,016
Investment securities held to maturity, cost 1,688 [1] 1,822 [2] 2,341 [1]
U. S. Treasury [Member]
     
Schedule of Investments [Line Items]      
Investment securities available for sale, cost 1,065,035 887,041 1,464,513
Investment securities available for sale, gross unrealized gains 306 808 2,691
Investment securities available for sale, gross unrealized losses 305 30 234
Total investment securities available for sale, fair value 1,065,036 887,819 1,466,970
Government Agency [Member]
     
Schedule of Investments [Line Items]      
Investment securities available for sale, cost 2,859,197 2,591,974 2,115,575
Investment securities available for sale, gross unrealized gains 1,228 1,747 352
Investment securities available for sale, gross unrealized losses 5,040 1,512 17,394
Total investment securities available for sale, fair value 2,855,385 2,592,209 2,098,533
Corporate Bonds [Member]
     
Schedule of Investments [Line Items]      
Investment securities available for sale, cost 225,214 250,476 453,390
Investment securities available for sale, gross unrealized gains 1,214 2,344 6,327
Investment securities available for sale, gross unrealized losses 0 0 0
Total investment securities available for sale, fair value 226,428 252,820 459,717
Residential Mortgage-Backed Securities [Member]
     
Schedule of Investments [Line Items]      
Investment securities available for sale, cost 282,706 298,402 152,483
Investment securities available for sale, gross unrealized gains 8,393 9,165 3,971
Investment securities available for sale, gross unrealized losses 191 346 532
Total investment securities available for sale, fair value 290,908 307,221 155,922
Investment securities held to maturity, cost 1,688 1,822 2,341
Investment securities held to maturity, gross unrealized gains 183 184 217
Investment securities held to maturity, gross unrealized losses 27 26 21
Investment securities held to maturity, fair value 1,844 1,980 2,537
Equity Securities [Member]
     
Schedule of Investments [Line Items]      
Investment securities available for sale, cost 894 939 965
Investment securities available for sale, gross unrealized gains 18,049 14,374 18,656
Investment securities available for sale, gross unrealized losses 0 0 0
Total investment securities available for sale, fair value 18,943 15,313 19,621
State, County and Municipal [Member]
     
Schedule of Investments [Line Items]      
Investment securities available for sale, cost 1,026 1,026 1,238
Investment securities available for sale, gross unrealized gains 14 16 19
Investment securities available for sale, gross unrealized losses 1 1 4
Total investment securities available for sale, fair value $ 1,039 $ 1,041 $ 1,253
[1] Unaudited
[2] Derived from 2011 Annual Report on Form 10-K.