Leases (Summary Of Lease Costs By Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Amortization of right-of-use assets	$ 26	$ 25
Interest on lease liabilities	2	3
Operating lease cost	481	460
Variable lease cost	151	138
Total lease cost	$ 660	$ 626