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INCOME TAXES - Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
DEFERRED TAX ASSETS:
Allowance for loan losses	$ 1,949	$ 1,821
Unfunded commitment reserve	215	187
Unrealized investment security losses	0	374
Premises and equipment	1,129	1,056
Accrued pension obligation	1,093	144
Other	230	255
Total tax assets	4,616	3,837
DEFERRED TAX LIABILITIES:
Investment accretion	(82)	(90)
Unrealized investment security gains	(456)	0
Other	(102)	(110)
Total tax liabilities	(640)	(200)
Deferred Tax Assets, Net, Total	$ 3,976	$ 3,637

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