Leases - Summary (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) item	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) item	Sep. 30, 2018 USD ($)
Leases
Operating lease, liability	$ 867		$ 867
Lease expense	123	$ 123	368	$ 369
Cash paid for amounts included in the measurement of lease liabilities for operating leases:	$ 135		404
ROU assets obtained in exchange for lease liabilities			$ 859
Weighted average remaining lease term in months	19 months		19 months
Weighted average discount rate	2.75%		2.75%
Corporate headquarters and main retail branch
Leases
Number of options to extend | item	1		1
Extension term	5 years		5 years
Option to extend lease term			true
Operating lease, Right-of-use asset	$ 859		$ 859
Operating lease, liability	$ 867		$ 867