LOANS - Changes in allowance for loan losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Residential 1-4 family
Beginning balance	$ 1,926	$ 2,132
Provision	100	475
Charge-offs	(197)	(706)
Recoveries	33	26
Ending balance	1,862	1,926
Residential 5+ multifamily
Beginning balance	62	33
Provision	93	32
Charge-offs		(3)
Recoveries
Ending balance	155	62
Construction of residential 1-4 family
Beginning balance	91	37
Provision	(16)	54
Charge-offs
Recoveries
Ending balance	75	91
Home equity lines of credit
Beginning balance	348	354
Provision	(115)	37
Charge-offs	(4)	(47)
Recoveries	7	4
Ending balance	236	348
Residential real estate
Beginning balance	2,427	2,556
Provision	62	598
Charge-offs	(201)	(756)
Recoveries	40	29
Ending balance	2,328	2,427
Commercial
Beginning balance	1,920	1,507
Provision	836	597
Charge-offs	(453)	(187)
Recoveries	244	3
Ending balance	2,547	1,920
Construction of commercial
Beginning balance	38	92
Provision	42	(54)
Charge-offs
Recoveries
Ending balance	80	38
Commercial real estate
Beginning balance	1,958	1,599
Provision	878	543
Charge-offs	(453)	(187)
Recoveries	244	3
Ending balance	2,627	1,958
Farm Land
Beginning balance	28	37
Provision	45	15
Charge-offs	(43)	(24)
Recoveries	2
Ending balance	32	28
Vacant Land
Beginning balance	170	152
Provision	(2)	82
Charge-offs	(36)	(64)
Recoveries
Ending balance	132	170
Real estate secured
Beginning balance	4,583	4,344
Provision	983	1,238
Charge-offs	(733)	(1,031)
Recoveries	286	32
Ending balance	5,119	4,583
Commercial and industrial
Beginning balance	1,079	705
Provision	(299)	754
Charge-offs	(162)	(452)
Recoveries	296	72
Ending balance	984	1,079
Municipal
Beginning balance	53	61
Provision	(23)	(8)
Charge-offs
Recoveries
Ending balance	30	53
Consumer
Beginning balance	75	124
Provision	63	(4)
Charge-offs	(76)	(67)
Recoveries	18	22
Ending balance	80	75
Unallocated
Beginning balance	337	482
Provision	226	(145)
Charge-offs
Recoveries
Ending balance	563	337
Totals
Beginning balance	6,127	5,716
Provision	1,020	1,835
Charge-offs	(971)	(1,550)
Recoveries	600	126
Ending balance	$ 6,776	$ 6,127