Employee Benefit Plans - Deferred Compensation Plans (Details) - Deferred Compensation Plans [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of deferred compensation plans | plan	2
Basis spread on credit rate	1.50%
Deferred compensation expense | $	$ 245	$ 226	$ 222