Leases - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Lessor, Operating Lease Maturity Year	2042
Weighted-average discount rate of operating leases	0.76%
Weighted average remaining life of operating leases	6 years 1 month 6 days
Rental expenses	$ 1,400,000	$ 1,700,000
Sublease Income	154,000	$ 182,000
Minimum rental to be received in future on subleases	$ 812,000
Sublease contract maturity year	2025