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Benefit Plans (Schedule Of Plan's Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Benefit Plans [Abstract]    
Benefit obligation at beginning of measurement year $ 17,937 $ 19,889
Service cost 325 361
Interest cost 631 553
Actuarial loss 2,727 (1,762)
Benefits paid (841) (1,104)
Benefit obligation at end of measurement year 20,779 17,937
Fair value of plan assets at beginning of measurement year 16,549 17,192
Actual return on plan assets net of expenses 2,427 (539)
Employer contribution   1,000
Benefits paid (841) (1,104)
Fair value of plan assets at end of measurement year 18,135 16,549
Defined Benefit Plan, Funded Status of Plan, Total $ (2,644) $ (1,388)