Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Components of net periodic benefit cost
Service cost	$ 262	$ 267	$ 785	$ 801
Interest cost	130	117	390	351
Expected return on plan assets	(261)	(253)	(783)	(759)
Amortization of prior service cost	(15)	(14)	(45)	(42)
Recognized net actuarial loss	38	29	114	87
Net periodic benefit cost	$ 154	$ 146	$ 461	$ 438