LOANS - Changes in allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Residential 1-4 family
Beginning balance	$ 1,982	$ 1,990	$ 1,862	$ 1,925
Provision	24	(38)	154	69
Charge-offs		(37)	(10)	(80)
Recoveries	1	2	1	3
Ending balance	2,007	1,917	2,007	1,917
Residential 5+ multifamily
Beginning balance	216	84	155	62
Provision	42	32	103	54
Charge-offs
Recoveries
Ending balance	258	116	258	116
Construction of residential 1-4 family
Beginning balance	74	77	75	91
Provision	8	(6)	7	(20)
Charge-offs
Recoveries
Ending balance	82	71	82	71
Home equity lines of credit
Beginning balance	233	330	236	348
Provision	1	(81)	(3)	(100)
Charge-offs
Recoveries			1	1
Ending balance	234	249	234	249
Residential real estate
Beginning balance	2,505	2,481	2,328	2,426
Provision	75	(93)	261	3
Charge-offs		(37)	(10)	(80)
Recoveries	1	2	2	4
Ending balance	2,581	2,353	2,581	2,353
Commercial
Beginning balance	2,666	1,989	2,547	1,919
Provision	259	348	377	578
Charge-offs	(149)		(149)	(188)
Recoveries		1	1	29
Ending balance	2,776	2,338	2,776	2,338
Construction of commercial
Beginning balance	93	33	80	38
Provision	9	13	22	8
Charge-offs
Recoveries
Ending balance	102	46	102	46
Commercial real estate
Beginning balance	2,759	2,022	2,627	1,957
Provision	268	361	399	586
Charge-offs	(149)		(149)	(188)
Recoveries		1	1	29
Ending balance	2,878	2,384	2,878	2,384
Farm land
Beginning balance	33	39	32	28
Provision	4	(16)	5	10
Charge-offs				(15)
Recoveries
Ending balance	37	23	37	23
Vacant land
Beginning balance	131	150	131	170
Provision	3	(19)	3	(39)
Charge-offs
Recoveries
Ending balance	134	131	134	131
Real estate secured
Beginning balance	5,428	4,692	5,118	4,581
Provision	350	233	668	560
Charge-offs	(149)	(37)	(159)	(283)
Recoveries	1	3	3	33
Ending balance	5,630	4,891	5,630	4,891
Commercial and industrial
Beginning balance	938	916	984	1,080
Provision	201	193	159	(16)
Charge-offs		(120)	(10)	(121)
Recoveries	5	12	11	58
Ending balance	1,144	1,001	1,144	1,001
Municipal
Beginning balance	30	54	30	53
Provision	(1)	(36)	(1)	(35)
Charge-offs
Recoveries
Ending balance	29	18	29	18
Consumer
Beginning balance	61	93	81	76
Provision	3	(10)	14	30
Charge-offs	(6)	(15)	(45)	(46)
Recoveries	5	1	13	9
Ending balance	63	69	63	69
Unallocated
Beginning balance	601	530	563	337
Provision	(86)	(16)	(48)	177
Charge-offs
Recoveries
Ending balance	515	514	515	514
Totals
Beginning balance	7,058	6,285	6,776	6,127
Provision	467	364	792	716
Charge-offs	(155)	(172)	(214)	(450)
Recoveries	11	16	27	100
Ending balance	$ 7,381	$ 6,493	$ 7,381	$ 6,493