9. Employee Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Components of net periodic cost (benefit)
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	194	214	388	428
Expected return on assets	(291)	(287)	(582)	(574)
Amortization of transition (asset)/obligation	0	0	0	0
Amortization of net (gain)/loss	111	101	222	202
Net periodic cost (benefit)	$ 14	$ 28	$ 28	$ 56