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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value $ 559,133 $ 301,101
Securities Available-for-Sale, Less than 12 months, Unrealized losses 3,315 1,727
Securities Available-for-Sale, 12 months or longer, Fair value      
Securities Available-for-Sale, 12 months or longer, Unrealized losses      
Securities Available-for-Sale, Fair value, Total 559,133 301,101
Securities Available-for-Sale, Unrealized losses, Total 3,315 1,727
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 387,683 177,470
Securities Available-for-Sale, Less than 12 months, Unrealized losses 2,957 1,280
Securities Available-for-Sale, 12 months or longer, Fair value      
Securities Available-for-Sale, 12 months or longer, Unrealized losses      
Securities Available-for-Sale, Fair value, Total 387,683 177,470
Securities Available-for-Sale, Unrealized losses, Total 2,957 1,280
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value 171,450 123,631
Securities Available-for-Sale, Less than 12 months, Unrealized losses 358 447
Securities Available-for-Sale, 12 months or longer, Fair value      
Securities Available-for-Sale, 12 months or longer, Unrealized losses      
Securities Available-for-Sale, Fair value, Total 171,450 123,631
Securities Available-for-Sale, Unrealized losses, Total 358 447
Securities Held-to-Maturity, Less than 12 months, Fair value   10,120
Securities Held-to-Maturity, Less than 12 months, Unrealized losses   38
Securities Held-to-Maturity, 12 months or longer, Fair value     
Securities Held-to-Maturity, 12 months or longer, Unrealized losses     
Securities Held-to-Maturity, Fair value, Total   10,120
Securities Held-to-Maturity, Unrealized losses, Total   $ 38