Employee Benefit Plans - Net Periodic Pension Cost of Defined Benefit Plan (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract]
Service cost	$ 32	$ 235	$ 95	$ 454
Interest cost	37	36	111	99
Amortization of prior service cost	20	20	62	62
Net periodic benefit cost	$ 89	$ 291	$ 268	$ 615