LOANS - Changes in allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Residential 1-4 family
Beginning balance	$ 1,862	$ 1,925
Provision	129	107
Charge-offs	(10)	(43)
Recoveries	1	1
Ending balance	1,982	1,990
Residential 5+ multifamily
Beginning balance	155	62
Provision	61	22
Charge-offs
Recoveries
Ending balance	216	84
Construction of residential 1-4 family
Beginning balance	75	91
Provision	(1)	(14)
Charge-offs
Recoveries
Ending balance	74	77
Home equity lines of credit
Beginning balance	236	348
Provision	(3)	(19)
Charge-offs
Recoveries		1
Ending balance	233	330
Residential real estate
Beginning balance	2,328	2,426
Provision	186	96
Charge-offs	(10)	(43)
Recoveries	1	2
Ending balance	2,505	2,481
Commercial
Beginning balance	2,547	1,919
Provision	119	230
Charge-offs		(188)
Recoveries		28
Ending balance	2,666	1,989
Construction of commercial
Beginning balance	80	38
Provision	13	(5)
Charge-offs
Recoveries
Ending balance	93	33
Commercial
Beginning balance	2,627	1,957
Provision	132	225
Charge-offs		(188)
Recoveries		28
Ending balance	2,759	2,022
Farm land
Beginning balance	32	28
Provision	1	26
Charge-offs		(15)
Recoveries
Ending balance	33	39
Vacant land
Beginning balance	131	170
Provision		(20)
Charge-offs
Recoveries
Ending balance	131	150
Real estate secured
Beginning balance	5,118	4,581
Provision	319	327
Charge-offs	(10)	(246)
Recoveries	1	30
Ending balance	5,428	4,692
Commercial and industrial
Beginning balance	984	1,080
Provision	(42)	(208)
Charge-offs	(9)	(1)
Recoveries	5	45
Ending balance	938	916
Municipal
Beginning balance	30	53
Provision		1
Charge-offs
Recoveries
Ending balance	30	54
Consumer
Beginning balance	81	76
Provision	12	39
Charge-offs	(40)	(30)
Recoveries	8	8
Ending balance	61	93
Unallocated
Beginning balance	563	337
Provision	38	193
Charge-offs
Recoveries
Ending balance	601	530
Totals
Beginning balance	6,776	6,127
Provision	327	352
Charge-offs	(59)	(277)
Recoveries	14	83
Ending balance	$ 7,058	$ 6,285