Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Requisite service period	3 years
Accumulated benefit obligation	$ 10,600	$ 10,200
Future amortization of prior service cost (credit)	$ 236
Maximum annual contributions per employee, percent	20.00%
Employer matching contribution, percent	4.00%
Employer discretionary contribution amount	$ 196	178
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit plan retirement age	65 years
Plan liabilities	$ 1,100	1,100
Benefit expense	114	162
Board of Directors
Defined Benefit Plan Disclosure [Line Items]
Employer discretionary contribution amount	$ 105	$ 108