Components of Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Average daily balance during the year
Service cost
Interest cost	113	107	226	214
Expected return on plan assets	(174)	(192)	(348)	(383)
Net amortization	90	92	179	183
Total periodic pension cost	$ 29	$ 7	$ 57	$ 14