Leases - Summary (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) item	Mar. 31, 2019 USD ($)
Leases
Operating lease, liability		$ 603
Lease expense	$ 121	$ 123
Cash paid for amounts included in the measurement of lease liabilities for operating leases:	$ 86
Weighted average remaining lease term in months	13 months
Weighted average discount rate	2.75%
Corporate headquarters and main retail branch
Leases
Number of options to extend | item	1
Extension term	5 years
Option to extend lease term	true
Operating lease, Right-of-use asset	$ 594
Operating lease, liability	$ 603