LOANS - Changes in allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Activities Loans - Residential
Beginning balance	$ 2,353	$ 2,248	$ 2,427	$ 2,477
Provision	34	224	35	370
Charge-offs	(93)	(155)	(172)	(550)
Recoveries	4	8	8	28
Ending balance	2,298	2,325	2,298	2,325
Business Activities Loans - Commercial
Beginning balance	2,099	1,734	1,683	1,466
Provision	50	29	504	332
Charge-offs		(1)	(38)	(37)
Recoveries	69		69	1
Ending balance	2,218	1,762	2,218	1,762
Business Activities Loans - Land
Beginning balance	154	166	198	188
Provision	51	82	23	106
Charge-offs	(27)	(42)	(43)	(88)
Recoveries
Ending balance	178	206	178	206
Business Activities Loans - Real Estate
Beginning balance	4,606	4,148	4,308	4,131
Provision	135	335	562	808
Charge-offs	(120)	(198)	(253)	(675)
Recoveries	73	8	77	29
Ending balance	4,694	4,293	4,694	4,293
Business Activities Loans - Commercial and industrial
Beginning balance	979	851	1,043	683
Provision	(59)	(16)	(115)	(167)
Charge-offs		(2)	(57)	(32)
Recoveries	1	25	50	40
Ending balance	921	858	921	858
Business Activities Loans - Municipal
Beginning balance	18	56	53	61
Provision	2	(3)	(33)	(8)
Charge-offs
Recoveries
Ending balance	20	53	20	53
Business Activities Loans - Consumer
Beginning balance	69	89	75	124
Provision	12	17	43	1
Charge-offs	(17)	(17)	(63)	(46)
Recoveries	4	5	13	15
Ending balance	68	94	68	94
Business Activities Loans - Unallocated
Beginning balance	514	334	337	482
Provision	63	(19)	240	(167)
Charge-offs
Recoveries
Ending balance	577	315	577	315
Business Activities Loans - Totals
Beginning balance	6,186	5,478	5,816	5,481
Provision	153	314	697	801
Charge-offs	(137)	(217)	(373)	(753)
Recoveries	78	38	140	84
Ending balance	6,280	5,613	6,280	5,613
Acquired Loans - Residential
Beginning balance		69		79
Provision		5		(5)
Charge-offs
Recoveries
Ending balance		74		74
Acquired Loans - Commercial
Beginning balance	285	134	275	132
Provision	53	37	184	133
Charge-offs	(190)		(340)	(98)
Recoveries	48		77	4
Ending balance	196	171	196	171
Acquired Loans - Land
Beginning balance
Provision
Charge-offs
Recoveries
Ending balance
Acquired Loans - Real Estate
Beginning balance	285	203	275	211
Provision	53	42	184	128
Charge-offs	(190)		(340)	(98)
Recoveries	48		77	4
Ending balance	196	245	196	245
Acquired Loans - Commercial and industrial
Beginning balance	22	37	36	24
Provision	31	(11)	72	403
Charge-offs	(41)		(105)	(416)
Recoveries	6	8	15	23
Ending balance	18	34	18	34
Acquired Loans - Municipal
Beginning balance
Provision
Charge-offs
Recoveries
Ending balance
Acquired Loans - Consumer
Beginning balance
Provision
Charge-offs
Recoveries
Ending balance
Acquired Loans - Unallocated
Beginning balance
Provision
Charge-offs
Recoveries
Ending balance
Acquired Loans - Totals
Beginning balance	307	240	311	235
Provision	84	31	256	531
Charge-offs	(231)		(445)	(514)
Recoveries	54	8	92	27
Ending balance	$ 214	$ 279	$ 214	$ 279