Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases
Lease liabilities	$ 1,001		$ 1,001
Right-of-use assets	$ 984		$ 984
Weighted average remaining lease term			3 years 6 months 25 days
Weighted average discount rate	2.97%		2.97%
Operating lease cost	$ 37	$ 30	$ 88	$ 88
Total lease cost	37	30	88	88
Cash paid for amounts included in the measurement of lease liabilities	$ 42	$ 28	$ 108	$ 98