Securities (Summary Of Maturities, Amortized Cost And Estimated Fair Values Of Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Available-for-sale Securities [Abstract]
Due in one year or less, Amortized Cost	$ 51,347
Due from one to five years, Amortized Cost	83,714
Due from five to ten years, Amortized Cost	37,788
Due after ten years, Amortized Cost	161,104
Equity securities, Amortized Cost	137
Total Amortized Cost	334,090	$ 267,105	$ 253,671
Due in one year or less, Estimated Fair Value	51,932
Due from one to five years, Estimated Fair Value	84,486
Due from five to ten years, Estimated Fair Value	37,708
Due after ten years, Estimated Fair Value	162,548
Equity securities, Estimated Fair Value	137
Total Estimated Fair Value	$ 336,811