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Components of Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Average daily balance during the year        
Service cost
Interest cost 71 91 142 182
Expected return on plan assets (213) (196) (426) (392)
Net amortization 75 76 150 151
Total periodic pension income $ (67) $ (29) $ (134) $ (59)