Employee Benefit Plans - Summary of Components of Net Periodic Pension Cost of Defined Benefit Plan Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021
Employee Benefit Plans
Reduction in service cost	$ 18		$ (51)		$ (137)
Service cost		$ 32		$ 95
Interest cost	38	37	107	111
Amortization of prior service cost		20	332	62
Net periodic benefit cost	$ 56	$ 89	$ 388	$ 268