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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value   $ 494,068
Securities Available-for-Sale, Less than 12 months, Unrealized losses   11,462
Securities Available-for-Sale, 12 months or longer, Fair value   221
Securities Available-for-Sale, 12 months or longer, Unrealized losses   14
Securities Available-for-Sale, Fair value, Total   494,289
Securities Available-for-Sale, Unrealized losses, Total   11,476
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   74,379
Securities Available-for-Sale, Less than 12 months, Unrealized losses   1,956
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   74,379
Securities Available-for-Sale, Unrealized losses, Total   1,956
Obligations Of States And Political Subdivisions [Member]
   
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value   1,459
Securities Available-for-Sale, Less than 12 months, Unrealized losses   52
Securities Available-for-Sale, Fair value, Total   1,459
Securities Available-for-Sale, Unrealized losses, Total   52
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
   
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value   418,156
Securities Available-for-Sale, Less than 12 months, Unrealized losses   9,425
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   418,156
Securities Available-for-Sale, Unrealized losses, Total   9,425
Securities Held-to-Maturity, Less than 12 months, Fair value 107,352 297,584
Securities Held-to-Maturity, Less than 12 months, Unrealized losses 185 4,620
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 107,352 297,584
Securities Held-to-Maturity, Unrealized losses, Total 185 4,620
Other Equity Securities [Member]
   
Schedule of Investments [Line Items]    
Securities Available-for-Sale, Less than 12 months, Fair value    74
Securities Available-for-Sale, Less than 12 months, Unrealized losses    29
Securities Available-for-Sale, 12 months or longer, Fair value 80 221
Securities Available-for-Sale, 12 months or longer, Unrealized losses 31 14
Securities Available-for-Sale, Fair value, Total 80 295
Securities Available-for-Sale, Unrealized losses, Total $ 31 $ 43