Securities (Summary Of Maturities, Amortized Cost And Estimated Fair Values Of Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Available-for-sale Securities [Abstract]
Due in one year or less, Amortized Cost	$ 50,098
Due from one to five years, Amortized Cost	89,853
Due from five to ten years, Amortized Cost	23,326
Due after ten years, Amortized Cost	118,875
Equity securities, Amortized Cost	137
Total Amortized Cost	282,289	$ 267,105	$ 266,123
Due in one year or less, Estimated Fair Value	50,397
Due from one to five years, Estimated Fair Value	90,143
Due from five to ten years, Estimated Fair Value	23,263
Due after ten years, Estimated Fair Value	118,088
Equity securities, Estimated Fair Value	137
Total Estimated Fair Value	$ 282,028