Components of Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Average daily balance during the year
Service cost
Interest cost	91	113	182	226
Expected return on plan assets	(196)	(174)	(392)	(348)
Net amortization	76	90	151	179
Total periodic pension (income) cost	$ (29)	$ 29	$ (59)	$ 57