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Benefit Plans (Schedule Of Net Benefit Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Benefit Plans [Abstract]    
Service cost $ 332 $ 325
Interest cost 525 631
Expected return on plan assets (1,079) (1,087)
Recognized net actuarial loss 904 552
Total pension expense $ 682 $ 421