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Securities Available For Sale (Schedule Of Maturities Distribution Of The Amortized Cost And Estimated Fair Value Of Securities Available For Sale) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Securities Available For Sale [Abstract]    
Amortized Cost, Due one year of less $ 1,073  
Amortized Cost, Due after one year through five years 1,706  
Amortized Cost, Due after five years through ten years 25,052  
Amortized Cost, Due after ten years 377,450  
Securities Available for Sale, Amortized Cost 405,281 371,211
Estimated Fair Value, Due one year of less 1,081  
Estimated Fair Value, Due after one year through five years 1,667  
Estimated Fair Value, Due after five years through ten years 26,209  
Estimated Fair Value, Due after ten years 392,869  
Securities Available for Sale, Estimated Fair Value $ 421,826 $ 381,880