LOANS - Allowance for loan losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	$ 8,669
Allowance for loan losses, Balance, end of period	8,324	$ 8,669
Ending Balance: individually evaluated for impairment	413	87	$ 61
Ending Balance: collectively evaluated for impairment	7,911	8,582	8,774
Loans
Ending balance: individually evaluated for impairment	11,212	11,734	8,011
Ending balance	1,032,089	987,779	983,931
Excluding Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	8,066	8,704	8,362
Provision for (recovery of) loan losses	(772)	628	(1,285)
Loans charged-off	(1,156)	(469)	(1,306)
Recoveries	373	459	363
Allowance for loan losses, Balance, end of period	8,055	8,066	8,704
Loans
Ending balance: collectively evaluated for impairment	1,005,164	956,777	952,659
Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	603	131	49
Provision for (recovery of) loan losses	334	(472)	(82)
Loans charged-off	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Balance, end of period	269	603	131
Loans
Ending balance: collectively evaluated for impairment	15,713	19,268	23,261
Total Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	8,669	8,835	8,411
Provision for (recovery of) loan losses	(438)	156	(1,367)
Loans charged-off	(1,156)	(469)	(1,306)
Recoveries	373	459	363
Allowance for loan losses, Balance, end of period	8,324	8,669	8,835
Commercial and industrial Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance: individually evaluated for impairment	403	51	50
Ending Balance: collectively evaluated for impairment	902	925	757
Loans
Ending balance: individually evaluated for impairment	3,527	3,526	1,083
Ending balance	75,748	74,181	106,164
Commercial and industrial Other [Member] | Excluding Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	762	742	1,211
Provision for (recovery of) loan losses	(1,143)	23	607
Loans charged-off	(790)	(196)	(73)
Recoveries	12	239	211
Allowance for loan losses, Balance, end of period	1,127	762	742
Loans
Ending balance: collectively evaluated for impairment	71,118	68,891	102,148
Commercial and industrial Other [Member] | Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	214	65	37
Provision for (recovery of) loan losses	36	(149)	(28)
Loans charged-off	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Balance, end of period	178	214	65
Loans
Ending balance: collectively evaluated for impairment	1,103	1,764	2,933
Commercial and industrial Other [Member] | Total Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	976	807	1,248
Provision for (recovery of) loan losses	(1,107)	(126)	579
Loans charged-off	(790)	(196)	(73)
Recoveries	12	239	211
Allowance for loan losses, Balance, end of period	1,305	976	807
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance: individually evaluated for impairment	0	14	0
Ending Balance: collectively evaluated for impairment	1,737	1,371	1,955
Loans
Ending balance: individually evaluated for impairment	440	588	385
Ending balance	221,878	170,404	177,933
Construction [Member] | Excluding Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	1,385	1,955	1,301
Provision for (recovery of) loan losses	(328)	576	(642)
Loans charged-off	0	0	(17)
Recoveries	18	6	29
Allowance for loan losses, Balance, end of period	1,731	1,385	1,955
Loans
Ending balance: collectively evaluated for impairment	220,761	169,065	176,479
Construction [Member] | Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	0	0	0
Provision for (recovery of) loan losses	(6)	0	0
Loans charged-off	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Balance, end of period	6	0	0
Loans
Ending balance: collectively evaluated for impairment	677	751	1,069
Construction [Member] | Total Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	1,385	1,955	1,301
Provision for (recovery of) loan losses	(334)	576	(642)
Loans charged-off	0	0	(17)
Recoveries	18	6	29
Allowance for loan losses, Balance, end of period	1,737	1,385	1,955
Commercial real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance: individually evaluated for impairment	0	0	0
Ending Balance: collectively evaluated for impairment	2,851	3,409	3,370
Loans
Ending balance: individually evaluated for impairment	5,585	5,678	4,427
Ending balance	459,115	457,611	403,100
Commercial real estate [Member] | Excluding Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	3,024	3,304	3,448
Provision for (recovery of) loan losses	371	326	(754)
Loans charged-off	(10)	(2)	(914)
Recoveries	194	48	16
Allowance for loan losses, Balance, end of period	2,837	3,024	3,304
Loans
Ending balance: collectively evaluated for impairment	447,760	444,354	389,617
Commercial real estate [Member] | Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	385	66	0
Provision for (recovery of) loan losses	371	(319)	(66)
Loans charged-off	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Balance, end of period	14	385	66
Loans
Ending balance: collectively evaluated for impairment	5,770	7,579	9,056
Commercial real estate [Member] | Total Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	3,409	3,370	3,448
Provision for (recovery of) loan losses	742	7	(820)
Loans charged-off	(10)	(2)	(914)
Recoveries	194	48	16
Allowance for loan losses, Balance, end of period	2,851	3,409	3,370
1-to-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance: individually evaluated for impairment	10	22	11
Ending Balance: collectively evaluated for impairment	1,483	1,645	1,047
Loans
Ending balance: individually evaluated for impairment	476	709	1,278
Ending balance	151,697	159,597	156,901
1-to-4 family residential [Member] | Excluding Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	1,663	1,058	846
Provision for (recovery of) loan losses	259	(585)	(188)
Loans charged-off	0	(12)	(22)
Recoveries	33	32	46
Allowance for loan losses, Balance, end of period	1,437	1,663	1,058
Loans
Ending balance: collectively evaluated for impairment	144,003	150,700	146,504
1-to-4 family residential [Member] | Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	4	0	0
Provision for (recovery of) loan losses	(52)	(4)	0
Loans charged-off	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Balance, end of period	56	4	0
Loans
Ending balance: collectively evaluated for impairment	7,218	8,188	9,119
1-to-4 family residential [Member] | Total Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	1,667	1,058	846
Provision for (recovery of) loan losses	207	(589)	(188)
Loans charged-off	0	(12)	(22)
Recoveries	33	32	46
Allowance for loan losses, Balance, end of period	1,493	1,667	1,058
HELOC [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance: individually evaluated for impairment	0	0	0
Ending Balance: collectively evaluated for impairment	329	555	549
Loans
Ending balance: individually evaluated for impairment	703	917	602
Ending balance	44,514	49,713	52,606
HELOC [Member] | Excluding Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	555	549	611
Provision for (recovery of) loan losses	169	(31)	(92)
Loans charged-off	(150)	(68)	(179)
Recoveries	93	43	25
Allowance for loan losses, Balance, end of period	329	555	549
Loans
Ending balance: collectively evaluated for impairment	43,763	48,747	51,958
HELOC [Member] | Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	0	0	12
Provision for (recovery of) loan losses	0	0	12
Loans charged-off	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Balance, end of period	0	0	0
Loans
Ending balance: collectively evaluated for impairment	48	49	46
HELOC [Member] | Total Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	555	549	623
Provision for (recovery of) loan losses	169	(31)	(80)
Loans charged-off	(150)	(68)	(179)
Recoveries	93	43	25
Allowance for loan losses, Balance, end of period	329	555	549
Loans to individuals & overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance: individually evaluated for impairment	0	0	0
Ending Balance: collectively evaluated for impairment	175	206	305
Loans
Ending balance: individually evaluated for impairment	284	101	1
Ending balance	10,013	12,814	10,244
Loans to individuals & overdrafts [Member] | Excluding Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	206	305	317
Provision for (recovery of) loan losses	(152)	(1)	(55)
Loans charged-off	(206)	(191)	(101)
Recoveries	23	91	34
Allowance for loan losses, Balance, end of period	175	206	305
Loans
Ending balance: collectively evaluated for impairment	9,729	12,713	10,176
Loans to individuals & overdrafts [Member] | Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	0	0	0
Provision for (recovery of) loan losses	0	0	0
Loans charged-off	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Balance, end of period	0	0	0
Loans
Ending balance: collectively evaluated for impairment	0	0	67
Loans to individuals & overdrafts [Member] | Total Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	206	305	317
Provision for (recovery of) loan losses	(152)	(1)	(55)
Loans charged-off	(206)	(191)	(101)
Recoveries	23	91	34
Allowance for loan losses, Balance, end of period	175	206	305
Multi-family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Ending Balance: individually evaluated for impairment	0	0	0
Ending Balance: collectively evaluated for impairment	434	471	791
Loans
Ending balance: individually evaluated for impairment	197	215	235
Ending balance	69,124	63,459	76,983
Multi-family residential [Member] | Excluding Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	471	791	628
Provision for (recovery of) loan losses	52	320	(161)
Loans charged-off	0	0	0
Recoveries	0	0	2
Allowance for loan losses, Balance, end of period	419	471	791
Loans
Ending balance: collectively evaluated for impairment	68,030	62,307	75,777
Multi-family residential [Member] | Purchase Credit Impairment Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	0	0	0
Provision for (recovery of) loan losses	(15)	0	0
Loans charged-off	0	0	0
Recoveries	0	0	0
Allowance for loan losses, Balance, end of period	15	0	0
Loans
Ending balance: collectively evaluated for impairment	897	937	971
Multi-family residential [Member] | Total Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, Balance, beginning of period	471	791	628
Provision for (recovery of) loan losses	37	320	(161)
Loans charged-off	0	0	0
Recoveries	0	0	2
Allowance for loan losses, Balance, end of period	$ 434	$ 471	$ 791