Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - Supplemental Executive Retirement Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 328	$ 330	$ 984	$ 990
Interest cost	113	96	339	288
Net periodic benefit cost	$ 441	$ 426	$ 1,323	$ 1,278