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Securities Available For Sale (Summary Of Maturities Distribution Of The Amortized Cost And Estimated Fair Value Of Securities Available For Sale) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Securities Available For Sale [Abstract]    
Amortized Cost, Due one year or less $ 28  
Amortized Cost, Due after one year through five years 4,623  
Amortized Cost, Due after five years through ten years 15,326  
Amortized Cost, Due after ten years 476,202  
Securities Available for Sale, Amortized Cost 496,179 $ 458,370
Estimated Fair Value, Due one year or less 28  
Estimated Fair Value, Due after one year through five years 4,668  
Estimated Fair Value, Due after five years through ten years 15,970  
Estimated Fair Value, Due after ten years 484,303  
Securities Available for Sale, Estimated Fair Value $ 504,969 $ 470,525