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Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Securities available-for-sale, at fair value $ 1,117,397 $ 1,297,522
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
   
Securities Available-for-Sale, Due within one year, Amortized cost 211,965  
Securities Available-for-Sale, Due within one year, Fair value 213,429  
Securities Available-for-Sale, Due one through five years, Amortized cost    
Securities Available-for-Sale, Due one through five years, Fair value    
Securities Available-for-Sale, Due five through ten years, Amortized cost 96,335  
Securities Available-for-Sale, Due five through ten years, Fair value 95,226  
Securities Available-for-Sale, Total, Amortized cost 308,300  
Securities available-for-sale, at fair value 308,655 273,313
Obligations Of States And Political Subdivisions [Member]
   
Securities Available-for-Sale, Due within one year, Amortized cost 3,695  
Securities Available-for-Sale, Due within one year, Fair value 3,712  
Securities Available-for-Sale, Due one through five years, Amortized cost 1,301  
Securities Available-for-Sale, Due one through five years, Fair value 1,397  
Securities Available-for-Sale, Total, Amortized cost 4,996  
Securities available-for-sale, at fair value 5,109 11,044
Securities Held-to-Maturity, Due within one year, Amortized cost 2,077  
Securities Held-to-Maturity, Due within one year, Fair value 2,082  
Securities Held-to-Maturity, Total, Amortized cost 2,077  
Securities Held-to-Maturity, Total, Fair value 2,082  
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
   
Securities Available-for-Sale, Total, Amortized cost 792,977  
Securities available-for-sale, at fair value 801,924 1,011,412
Securities Held-to-Maturity, Total, Amortized cost 773,234  
Securities Held-to-Maturity, Total, Fair value $ 784,140