Components of Net Periodic Pension Cost (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Average daily balance during the year
Service cost
Interest cost	106	119	320	358
Expected return on plan assets	(190)	(160)	(573)	(480)
Net amortization	91	103	274	309
Recognized settlement loss				2
Net periodic pension cost	7	$ 62	$ 21	$ 189
Defined Benefit Plan, Contributions by Employer	$ 2,000