LOANS - Changes in allowance for loan losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Residential 1-4 family
Beginning balance	$ 1,862	$ 1,926	$ 2,132
Provision	580	100	475
Charge-offs	(299)	(197)	(706)
Recoveries	6	33	25
Ending balance	2,149	1,862	1,926
Residential 5+ multifamily
Beginning balance	155	62	33
Provision	258	93	32
Charge-offs			(3)
Recoveries
Ending balance	413	155	62
Construction of residential 1-4 family
Beginning balance	75	91	37
Provision	8	(16)	54
Charge-offs
Recoveries
Ending balance	83	75	91
Home equity lines of credit
Beginning balance	236	348	354
Provision	(18)	(115)	37
Charge-offs		(4)	(47)
Recoveries	1	7	4
Ending balance	219	236	348
Business Activities Loans - Residential real estate
Beginning balance	2,328	2,427	2,556
Provision	828	62	598
Charge-offs	(200)	(201)	(756)
Recoveries	7	40	29
Ending balance	2,864	2,328	2,427
Commercial
Beginning balance	2,547	1,920	1,507
Provision	756	836	597
Charge-offs	(259)	(453)	(187)
Recoveries	4	244	3
Ending balance	3,048	2,547	1,920
Construction of commercial
Beginning balance	80	38	92
Provision	42	42	(54)
Charge-offs
Recoveries
Ending balance	122	80	38
Commercial real estate
Beginning balance	2,627	1,958	1,599
Provision	798	878	543
Charge-offs	(259)	(453)	(187)
Recoveries	4	244	3
Ending balance	3,170	2,627	1,958
Farm land
Beginning balance	32	28	37
Provision	(6)	45	15
Charge-offs		(43)	(24)
Recoveries	7	2
Ending balance	33	32	28
Vacant land
Beginning balance	132	170	152
Provision	(32)	(2)	82
Charge-offs		(36)	(64)
Recoveries
Ending balance	100	132	170
Real estate secured
Beginning balance	5,119	4,583	4,344
Provision	1,588	983	1,238
Charge-offs	(558)	(733)	(1,031)
Recoveries	18	286	32
Ending balance	6,167	5,119	4,583
Business Activities Loans - Commercial real estate
Beginning balance	984	1,079	705
Provision	255	(229)	754
Charge-offs	(108)	(162)	(452)
Recoveries	27	296	72
Ending balance	1,158	984	1,079
Municipal
Beginning balance	30	53	61
Provision	(18)	(23)	(8)
Charge-offs
Recoveries
Ending balance	12	30	53
Consumer
Beginning balance	80	75	124
Provision	28	63	(4)
Charge-offs	(81)	(76)	(67)
Recoveries	29	18	22
Ending balance	56	80	75
Unallocated
Beginning balance	563	337	482
Provision	(125)	226	(145)
Charge-offs
Recoveries
Ending balance	438	563	337
Totals
Beginning balance	6,776	6,127	5,716
Provision	1,728	1,020	1,835
Charge-offs	(848)	(971)	(1,550)
Recoveries	74	600	126
Ending balance	$ 7,831	$ 6,776	$ 6,127