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Investments (Aggregate Values And Unrealized Gains And Losses) (Details) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Schedule of Investments [Line Items]   
Investment securities available for sale, cost$ 3,965,995$ 4,486,881$ 3,745,815
Investment securities available for sale, gross unrealized gains31,46334,61841,136
Investment securities available for sale, gross unrealized losses2,63311,423110
Total investment securities available for sale, fair value3,994,8254,510,0763,786,841
Investment securities held to maturity, cost1,943[1]2,532[2]2,645[1]
U. S. Treasury [Member]
   
Schedule of Investments [Line Items]   
Investment securities available for sale, cost986,5071,935,6661,991,676
Investment securities available for sale, gross unrealized gains1,4274,0417,259
Investment securities available for sale, gross unrealized losses03070
Total investment securities available for sale, fair value987,9341,939,4001,998,935
Government Agency [Member]
   
Schedule of Investments [Line Items]   
Investment securities available for sale, cost2,261,0001,930,4691,120,476
Investment securities available for sale, gross unrealized gains2,3443611,840
Investment securities available for sale, gross unrealized losses2,43510,8440
Total investment securities available for sale, fair value2,260,9091,919,9861,122,316
Corporate Bonds [Member]
   
Schedule of Investments [Line Items]   
Investment securities available for sale, cost401,048479,160479,935
Investment securities available for sale, gross unrealized gains3,5957,4989,254
Investment securities available for sale, gross unrealized losses000
Total investment securities available for sale, fair value404,643486,658489,189
Residential Mortgage-Backed Securities [Member]
   
Schedule of Investments [Line Items]   
Investment securities available for sale, cost315,474139,291151,355
Investment securities available for sale, gross unrealized gains8,9164,5224,891
Investment securities available for sale, gross unrealized losses198268110
Total investment securities available for sale, fair value324,192143,545156,136
Investment securities held to maturity, cost1,9432,5322,645
Investment securities held to maturity, gross unrealized gains191235245
Investment securities held to maturity, gross unrealized losses262626
Investment securities held to maturity, fair value2,1082,7412,864
Equity Securities [Member]
   
Schedule of Investments [Line Items]   
Investment securities available for sale, cost9391,0551,132
Investment securities available for sale, gross unrealized gains15,16518,17617,865
Investment securities available for sale, gross unrealized losses000
Total investment securities available for sale, fair value16,10419,23118,997
State, County, Municipal [Member]
   
Schedule of Investments [Line Items]   
Investment securities available for sale, cost1,0271,2401,241
Investment securities available for sale, gross unrealized gains162027
Investment securities available for sale, gross unrealized losses040
Total investment securities available for sale, fair value$ 1,043$ 1,256$ 1,268
[1]Unaudited
[2]Derived from 2010 Annual Report on Form 10-K.