Benefit Plans (Details 1) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Components of Net Periodic Benefit Cost
Service cost	$ 250	$ 249	$ 995
Interest cost	307	289	$ 1,155
Net loss	73	53
Net periodic pension cost	$ 630	$ 591