Securities (Summary Of Maturities, Amortized Cost And Estimated Fair Values Of Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Due in one year or less, Amortized Cost	$ 29,692
Due from one to five years, Amortized Cost	79,060
Due from five to ten years, Amortized Cost	60,439
Due after ten years, Amortized Cost	103,024
Total Amortized Cost	272,215	$ 294,251
Due in one year or less, Estimated Fair Value	29,768
Due from one to five years, Estimated Fair Value	79,170
Due from five to ten years, Estimated Fair Value	60,627
Due after ten years, Estimated Fair Value	106,790
Total Estimated Fair Value	$ 276,355	$ 293,147