Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Average daily balance during the year
Interest cost	$ 119	$ 129	$ 358	$ 386
Expected return on plan assets	(160)	(166)	(480)	(457)
Net amortization	103	101	309	305
Recognized settlement loss			2
Net periodic pension cost	62	64	189	234
Amortization of actuarial loss	(103)	(204)	(309)	(306)
Total recognized in other comprehensive income	(103)	(204)	(309)	(306)
Total recognized in net expense and OCI (before tax)	$ (41)	$ (140)	$ (120)	$ (72)