LOANS - Risk ratings of the commercial and consumer loan portfolios (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 15, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,029,975	$ 986,040	$ 198,440
Total Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,029,975	986,040
Commercial and industrial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	75,748	74,181
Commercial and industrial Other [Member] | Total Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	75,748	74,181
Commercial and industrial Other [Member] | Superior [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,014	1,662
Commercial and industrial Other [Member] | Very Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	349	2,266
Commercial and industrial Other [Member] | Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,976	5,773
Commercial and industrial Other [Member] | Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	19,197	22,332
Commercial and industrial Other [Member] | Acceptable With Care [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	40,579	34,626
Commercial and industrial Other [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	242	879
Commercial and industrial Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,391	6,643
Commercial and industrial Other [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial and industrial Other [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	221,878	170,404
Construction [Member] | Superior [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Construction [Member] | Very Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	110	246
Construction [Member] | Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	8,674	12,106
Construction [Member] | Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	16,249	30,897
Construction [Member] | Acceptable With Care [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	196,228	125,788
Construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	436	711
Construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	181	656
Construction [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Construction [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	459,115	457,611
Commercial real estate [Member] | Total Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	459,115	457,611
Commercial real estate [Member] | Superior [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	337	21
Commercial real estate [Member] | Very Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,245	1,120
Commercial real estate [Member] | Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	62,643	47,959
Commercial real estate [Member] | Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	255,751	263,017
Commercial real estate [Member] | Acceptable With Care [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	133,190	139,484
Commercial real estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,490	1,789
Commercial real estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,459	4,221
Commercial real estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial real estate [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Multi-family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	69,124	63,459
Multi-family residential [Member] | Total Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	69,124	63,459
Multi-family residential [Member] | Superior [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Multi-family residential [Member] | Very Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Multi-family residential [Member] | Good [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,839	5,116
Multi-family residential [Member] | Acceptable [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	41,113	37,832
Multi-family residential [Member] | Acceptable With Care [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	23,172	20,296
Multi-family residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Multi-family residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	215
Multi-family residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Multi-family residential [Member] | Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
1-to-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	151,697	159,597
1-to-4 family residential [Member] | Total Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	151,697	159,597
1-to-4 family residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	147,958	155,117
1-to-4 family residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,246	900
1-to-4 family residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,493	3,580
HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	44,514	49,713
HELOC [Member] | Total Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	44,514	49,713
HELOC [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	43,585	48,143
HELOC [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	76	88
HELOC [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	853	1,482
Loans to individuals & overdrafts [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	10,013	12,814
Loans to individuals & overdrafts [Member] | Total Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	10,013	12,814
Loans to individuals & overdrafts [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	9,727	10,891
Loans to individuals & overdrafts [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 286	$ 1,923