FAIR VALUE - Assets and liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	$ 15,695	$ 18,888
SBA servicing assets	19,000	16,500
States and political subdivisions
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	1,279	1,213
Mortgage-backed GSE residential
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	1,980	2,492
Recurring
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	15,695	18,888
SBA servicing assets	8,162	8,419
Interest only strip	26	27
Assets	23,883	27,334
Recurring | Obligations of U.S. Government entities and agencies
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	12,436	15,183
Recurring | States and political subdivisions
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	1,279	1,213
Recurring | Mortgage-backed GSE residential
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	1,980	2,492
Non-recurring fair value measurements
Fair value assets and liabilities measured on recurring and nonrecurring basis
Impaired loans	4,523	3,472
Total Gains (Losses)	338	169
Level 2 | Recurring
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	3,259	3,705
Assets	3,259	3,705
Level 2 | Recurring | States and political subdivisions
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	1,279	1,213
Level 2 | Recurring | Mortgage-backed GSE residential
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	1,980	2,492
Level 3 | Recurring
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	12,436	15,183
SBA servicing assets	8,162	8,419
Interest only strip	26	27
Assets	20,624	23,629
Level 3 | Recurring | Obligations of U.S. Government entities and agencies
Fair value assets and liabilities measured on recurring and nonrecurring basis
Total securities available for sale	12,436	15,183
Level 3 | Non-recurring fair value measurements
Fair value assets and liabilities measured on recurring and nonrecurring basis
Impaired loans	$ 4,523	$ 3,472