Leases - Additional information regarding real estate operating leases (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Lease cost:
Operating lease	$ 62	$ 124
Other information on operating lease:
Cash payments included in the measurement of lease liability reported in operating cash flows	71	142
Operating lease liability	$ 845	$ 845
Weighted average discount rate	3.90%	3.90%
Weighted average remaining lease term in years	3 years 3 months	3 years 3 months
Other assets
Other information on operating lease:
Operating lease, right-of-use asset	$ 845	$ 845
Other liabilities
Other information on operating lease:
Operating lease liability	$ 845	$ 845