Leases - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Leases
Operating Lease, Right-of-Use Asset	$ 5,500,000		$ 5,500,000		$ 6,600,000
Operating Lease, Liability	5,841,000		5,841,000		$ 6,900,000
Additional lease assets recorded	15,000		58,000
Operating Lease, Payments	451,000	$ 401,000	1,335,000	$ 858,000
Lease, Cost	$ 443,000	$ 444,000	$ 1,325,000	$ 1,310,000
Option to extend			true
Operating Lease, Weighted Average Remaining Lease Term	6 years 2 months 12 days		6 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	4.30%		4.30%