Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Total lease liability	$ 21,008	$ 21,008
Operating lease, weighted average remaining lease term	7 years 7 months 6 days	7 years 7 months 6 days
Operating lease, weighted average discount rate	2.25%	2.25%
Lease, cost	$ 603	$ 1,900
Operating lease commitments due, next twelve months			$ 4,900
Operating lease commitments due, 2021			4,500
Operating lease commitments due, 2022			4,000
Operating lease commitments due, 2023			3,500
Operating lease commitments due, 2024			2,700
Operating lease commitments due thereafter			$ 5,000
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	5 years	5 years
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, renewal term	10 years	10 years
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use asset				$ 22,200
Total lease liability				$ 23,300