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Components of Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Average daily balance during the year        
Service cost
Interest cost 91 113 273 339
Expected return on plan assets (196) (174) (588) (522)
Net amortization 75 90 226 269
Total periodic pension (income) cost $ (30) $ 29 $ (89) $ 86