Components of Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Average daily balance during the year
Service cost
Interest cost	113	107
Expected return on plan assets	(174)	(191)
Net amortization	89	91
Total periodic pension cost	$ 28	$ 7