Employee Benefit Plans - Benefit Obligations of Defined Benefit Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	$ 3,571	$ 2,747
Service cost	31	47
Interest cost	37	29
Benefit obligation, end of year	$ 3,639	$ 2,823