Income Taxes - Components of net deferred income tax benefits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred income tax benefits:
Accrued deferred compensation	$ 78	$ 87
Allowance for credit losses	143	243
Net operating loss carryforward credits		153
Accumulated depreciation	(16)	(13)
Other real estate owned	36
Reserve for unfunded commitments	9	10
Accounting standard 310-20	(117)	(103)
Right of use asset	(171)	(205)
Lease liability	171	205
Accumulated securities premium accretion	214	215
Net unrealized depreciation on investment securities available for sale	(466)
Net unrealized loss on Swaps	261	80
Net deferred income tax benefits	$ 142	$ 672