Income Taxes - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for loan losses	$ 897	$ 799
Real estate owned		65
Accrued liabilities	137	150
State income taxes	36	34
Stock compensation	202	165
Net operating loss carryforward	3,614	3,887
Non-accrual loan interest	1	3
Partnership investment	173	140
General business credit	1,859	1,661
Alternative minimum tax credit	94	151
Unrealized appreciation AFS		50
Other	34	28
Total deferred tax assets	7,047	7,133
Deferred tax liabilities:
Section 481 Adjustments to bad debts	(660)	(980)
Deferred loan fees/costs	(797)	(775)
Basis difference on fixed assets	(15)	(35)
Net unrealized appreciation on available-for-sale securities	(59)
FHLB stock dividends	(266)	(266)
Mortgage servicing rights	(3)	(5)
Prepaid expenses	(27)	(27)
Total deferred tax liabilities	(1,827)	(2,088)
Net deferred tax assets	5,220	5,045
Valuation allowance
Valuation allowance	0	0
Deferred tax assets, net	$ 5,220	$ 5,045