Securities (Summary Of Maturities, Amortized Cost And Estimated Fair Values Of Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities [Abstract]
Due in one year or less, Amortized Cost	$ 39,528
Due from one to five years, Amortized Cost	83,175
Due from five to ten years, Amortized Cost	40,809
Due after ten years, Amortized Cost	161,259
Equity securities, Amortized Cost	137
Total Amortized Cost	324,908	$ 267,105
Due in one year or less, Estimated Fair Value	39,856
Due from one to five years, Estimated Fair Value	83,611
Due from five to ten years, Estimated Fair Value	40,619
Due after ten years, Estimated Fair Value	164,500
Equity securities, Estimated Fair Value	137
Total Estimated Fair Value	$ 328,723