Benefit Plans (Schedule Of Plan's Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Benefit Plans [Abstract]
Benefit obligation at beginning of measurement year	$ 19,889	$ 17,881	$ 18,609
Service cost	361	317	337
Interest cost	553	667	701
Actuarial loss	(1,762)	2,260	632
Settlement loss			(1,590)
Benefits paid	(1,104)	(1,236)	(808)
Benefit obligation at end of measurement year	17,937	19,889	17,881
Fair value of plan assets at beginning of measurement year	17,192	17,062	18,301
Actual return on plan assets net of expenses	(539)	1,366	1,159
Settlement loss			(1,590)
Employer contribution	1,000
Benefits paid	(1,104)	(1,236)	(808)
Fair value of plan assets at end of measurement year	16,549	17,192	17,062
Defined Benefit Plan, Funded Status of Plan, Total	$ (1,388)	$ (2,697)	$ (819)