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Benefit Plans (Schedule Of Plan's Funded Status And Assumptions Used) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Benefit Plans [Abstract]    
Benefit obligation at beginning of measurement year $ 20,779 $ 17,937
Service cost 332 325
Interest cost 525 631
Actuarial loss 2,275 2,727
Benefits paid (1,400) (841)
Benefit obligation at end of measurement year 22,511 20,779
Fair value of plan assets at beginning of measurement year 18,135 16,549
Actual return on plan assets net of expenses 1,727 2,427
Employer contribution 1,000  
Benefits paid (1,400) (841)
Fair value of plan assets at end of measurement year 19,462 18,135
Defined Benefit Plan, Funded Status of Plan, Total $ (3,049) $ (2,644)
Assumptions used to determine benefit obligations: Discount rate 2.33% 3.13%
Assumptions used to determine benefit obligations: Rate of compensation increase 4.00% 4.00%