Leases - Components of lease (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases
Operating lease cost	$ 1,069	$ 1,148	$ 2,141	$ 2,296
Operating cash flows from operating leases	$ 1,205	$ 1,267	$ 2,413	$ 2,534
Weighted average remaining lease term Operating leases	6 years 2 months 23 days	7 years 1 month 28 days	6 years 2 months 23 days	7 years 1 month 28 days
Weighted average discount rate Operating leases	2.35%	2.35%	2.35%	2.35%