Employee Benefit Plans - Net Periodic Pension Cost of Defined Benefit Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee Benefit and Share-based Payment Arrangement, Noncash Expense [Abstract]
Service cost	$ 32	$ 172	$ 63	$ 219
Interest cost	37	34	74	63
Amortization of prior service cost	21	21	42	42
Net periodic benefit cost	$ 90	$ 227	$ 179	$ 324