Components of Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Average daily balance during the year
Service cost
Interest cost	113	106	339	320
Expected return on plan assets	(174)	(190)	(522)	(573)
Net amortization	90	91	269	274
Total periodic pension cost	$ 29	$ 7	$ 86	$ 21