INCOME TAXES - Summary of components of the net deferred tax asset and liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets:
Allowance for loan losses	$ 1,666,000	$ 1,471,000
Provision for unfunded commitments	27,000	26,000
Deferred compensation	251,000	230,000
Contributions	0	1,000
Accrued rent expense	95,000	0
Operating lease liabilities	318,000	349,000
Finance lease liabilities	18,000	0
Loan purchase accounting	0	14,000
Limited partnership investments	252,000	242,000
Impairment loss on securities	4,000	4,000
Writedowns on OREO properties	2,000	3,000
Deferred health insurance	17,000	0
Capital and net operating loss carry forwards	88,000	70,000
Valuation allowance related to state net operating losses	(88,000)	(70,000)
Total	2,650,000	2,340,000
Deferred Tax Liabilities:
Net unrealized gains on debt securities available-for-sale	3,421,000	1,122,000
Loan fees and costs	171,000	288,000
Net unrealized gains on marketable equity securities	262,000	345,000
Operating lease right-of-use assets	318,000	322,000
Accumulated depreciation	307,000	363,000
Accretion	18,000	32,000
Mortgage servicing rights	42,000	49,000
Intangibles	257,000	257,000
Total	4,796,000	2,778,000
Net Deferred Tax Liability	$ (2,146,000)	$ (438,000)