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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
Sep. 30, 2016
Dec. 31, 2015
Securities Available For Sale [Abstract]    
Amortized Cost, Due one year or less $ 140  
Amortized Cost, Due after one year through five years 6,510  
Amortized Cost, Due after five years through ten years 16,068  
Amortized Cost, Due after ten years 502,738  
Securities Available for Sale, Amortized Cost 525,456 $ 496,179
Estimated Fair Value, Due one year or less 140  
Estimated Fair Value, Due after one year through five years 6,637  
Estimated Fair Value, Due after five years through ten years 16,756  
Estimated Fair Value, Due after ten years 513,754  
Securities Available for Sale, Estimated Fair Value $ 537,287 $ 504,969