Securities (Summary Of Maturities, Amortized Cost And Estimated Fair Values Of Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale Securities [Abstract]
Due in one year or less, Amortized Cost	$ 35,349
Due from one to five years, Amortized Cost	68,946
Due from five to ten years, Amortized Cost	45,860
Due after ten years, Amortized Cost	147,171
Equity securities, Amortized Cost	137
Total Amortized Cost	297,463	$ 324,908
Due in one year or less, Estimated Fair Value	35,433
Due from one to five years, Estimated Fair Value	68,958
Due from five to ten years, Estimated Fair Value	45,010
Due after ten years, Estimated Fair Value	147,352
Equity securities, Estimated Fair Value	137
Total Estimated Fair Value	$ 296,890