Employee Benefit Plans - Net Periodic Pension Cost of Defined Benefit Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract]
Service cost	$ 31	$ 47
Interest cost	37	29
Amortization of prior service cost	21	21
Net periodic benefit cost	$ 89	$ 97