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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value $ 347,872  
Securities Available-for-Sale, Less than 12 months, Unrealized losses 2,128  
Securities Available-for-Sale, 12 months or longer, Fair value 74  
Securities Available-for-Sale, 12 months or longer, Unrealized losses 29  
Securities Available-for-Sale, Fair value, Total 347,946  
Securities Available-for-Sale, Unrealized losses, Total 2,157  
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
   
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value 347,872  
Securities Available-for-Sale, Less than 12 months, Unrealized losses 2,128  
Securities Available-for-Sale, Fair value, Total 347,872  
Securities Available-for-Sale, Unrealized losses, Total 2,128  
Other Equity Securities [Member]
   
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value     
Securities Available-for-Sale, Less than 12 months, Unrealized losses     
Securities Available-for-Sale, 12 months or longer, Fair value 74 80
Securities Available-for-Sale, 12 months or longer, Unrealized losses 29 32
Securities Available-for-Sale, Fair value, Total 74 80
Securities Available-for-Sale, Unrealized losses, Total 29 32
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Securities Held-to-Maturity, Less than 12 months, Fair value 62,420   
Securities Held-to-Maturity, Less than 12 months, Unrealized losses 280   
Securities Held-to-Maturity, 12 months or longer, Fair value   38,775
Securities Held-to-Maturity, 12 months or longer, Unrealized losses   32
Securities Held-to-Maturity, Fair value, Total 62,420 38,775
Securities Held-to-Maturity, Unrealized losses, Total $ 280 $ 32