Leases - Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Leases
Operating lease cost	$ 148	$ 138	$ 295	$ 285
Net lease cost	148	138	295	285
Operating cash flows from operating leases	$ 142	130	$ 283	268
ROU assets obtained in exchange for new operating lease liabilities		$ 486		$ 3,252
Weighted average remaining lease term in years	6 years 4 months 20 days		6 years 4 months 20 days		6 years 9 months 3 days
Weighted average discount rate	5.49%		5.49%		5.47%
Operating lease right-of-use assets	$ 2,555		$ 2,555		$ 2,792