Leases (Summary Of Lease Costs By Type) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Amortization of right-of-use assets	$ 26	$ 24	$ 52	$ 49
Interest on lease liabilities	1	2	3	5
Operating lease cost	393	457	874	917
Variable lease cost	148	141	299	279
Total lease cost	$ 568	$ 624	$ 1,228	$ 1,250