LOANS - Changes in allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Residential 1-4 family
Beginning balance	$ 2,007	$ 1,917	$ 1,862	$ 1,925
Provision	201	(1)	355	67
Charge-offs		(88)	(10)	(167)
Recoveries	2	4	3	7
Ending balance	2,210	1,832	2,210	1,832
Residential 5+ multifamily
Beginning balance	258	116	155	62
Provision	80	9	183	63
Charge-offs
Recoveries
Ending balance	338	125	338	125
Construction of residential 1-4 family
Beginning balance	82	71	75	91
Provision	8	5	15	(15)
Charge-offs
Recoveries
Ending balance	90	76	90	76
Home equity lines of credit
Beginning balance	234	249	236	348
Provision	21	21	18	(79)
Charge-offs		(5)		(5)
Recoveries			1	1
Ending balance	255	265	255	265
Residential real estate
Beginning balance	2,581	2,353	2,328	2,426
Provision	310	34	571	36
Charge-offs		(93)	(10)	(172)
Recoveries	2	4	4	8
Ending balance	2,893	2,298	2,893	2,298
Commercial
Beginning balance	2,776	2,338	2,547	1,919
Provision	211	78	589	656
Charge-offs	(26)	(190)	(175)	(378)
Recoveries	1	117	1	146
Ending balance	2,962	2,343	2,962	2,343
Construction of commercial
Beginning balance	102	46	80	38
Provision	12	25	34	33
Charge-offs
Recoveries
Ending balance	114	71	114	71
Commercial real estate
Beginning balance	2,878	2,384	2,627	1,957
Provision	223	103	623	689
Charge-offs	(26)	(190)	(175)	(378)
Recoveries	1	117	1	146
Ending balance	3,076	2,414	3,076	2,414
Farm land
Beginning balance	37	23	32	28
Provision	(12)	32	(7)	43
Charge-offs		(27)		(43)
Recoveries	7		7
Ending balance	32	28	32	28
Vacant land
Beginning balance	134	131	131	170
Provision	(27)	19	(24)	(20)
Charge-offs
Recoveries
Ending balance	107	150	107	150
Real estate secured
Beginning balance	5,630	4,891	5,118	4,581
Provision	494	188	1,163	748
Charge-offs	(26)	(310)	(185)	(593)
Recoveries	10	121	12	154
Ending balance	6,108	4,890	6,108	4,890
Commercial and industrial
Beginning balance	1,144	1,001	984	1,080
Provision	(173)	(28)	(14)	(44)
Charge-offs	(2)	(41)	(12)	(162)
Recoveries	7	7	18	65
Ending balance	976	939	976	939
Municipal
Beginning balance	29	18	30	53
Provision	(11)	2	(12)	(33)
Charge-offs
Recoveries
Ending balance	18	20	18	20
Consumer
Beginning balance	63	69	81	76
Provision	(9)	12	5	42
Charge-offs	(10)	(17)	(55)	(63)
Recoveries	7	4	20	13
Ending balance	51	68	51	68
Unallocated
Beginning balance	515	514	563	337
Provision	77	63	29	240
Charge-offs
Recoveries
Ending balance	592	577	592	577
Totals
Beginning balance	7,381	6,493	6,776	6,127
Provision	378	237	1,171	953
Charge-offs	(38)	(368)	(252)	(818)
Recoveries	24	132	50	232
Ending balance	$ 7,745	$ 6,494	$ 7,745	$ 6,494