Income Taxes - Reconciliation of income tax expense computed at statutory rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Income tax expense at federal statutory rate	$ 431	$ 360
Federal Tax Rate	21.00%	21.00%
Increase (decrease) resulting from:
Tax-exempt income	$ (72)	$ (200)
Bank owned life insurance	(34)	(101)
State income taxes, net of Federal income tax benefit	127	74
Other		(3)
Income tax expense	$ 452	$ 130