LOANS - Composition of loans receivable by delinquency status (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current
Residential 1-4 family	$ 314,798	$ 297,895
Residential 5+ multifamily	18,108	13,625
Construction of residential 1-4 family	11,197	10,951
Home equity lines of credit	33,219	35,190
Residential real estate	377,322	357,661
Commercial	244,869	229,376
Construction of commercial	9,730	5,140
Commercial real estate	254,599	234,516
Farm land	4,032	2,402
Vacant land	7,883	6,575
Real estate secured	643,836	601,154
Commercial and industrial	131,991	140,623
Municipal	17,494	8,626
Consumer	4,752	5,336
Loans receivable, gross	798,073	755,739
Past due 30-59 days
Residential 1-4 family	1,410	1,305
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	75	155
Residential real estate	1,485	1,460
Commercial	1,888	1,213
Construction of commercial
Commercial real estate	1,888	1,213
Farm land	242	789
Vacant land		25
Real estate secured	3,615	3,487
Commercial and industrial	131	565
Municipal
Consumer	34	26
Loans receivable, gross	3,780	4,078
Past due 60-89 days
Residential 1-4 family	165	213
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	477	88
Residential real estate	642	301
Commercial	758	250
Construction of commercial
Commercial real estate	758	250
Farm land
Vacant land
Real estate secured	1,400	551
Commercial and industrial	218	239
Municipal
Consumer	8	15
Loans receivable, gross	1,626	805
Past due 90-179 days
Residential 1-4 family	156	327
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	156	327
Commercial		2,139
Construction of commercial
Commercial real estate		2,139
Farm land
Vacant land
Real estate secured	156	2,466
Commercial and industrial	391	46
Municipal
Consumer		3
Loans receivable, gross	547	2,515
Past due 180 days and over
Residential 1-4 family	1,110	1,388
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit		54
Residential real estate	1,110	1,442
Commercial	1,796	2,504
Construction of commercial	258	258
Commercial real estate	2,054	2,762
Farm land		723
Vacant land
Real estate secured	3,164	4,927
Commercial and industrial
Municipal
Consumer
Loans receivable, gross	3,164	4,927
Past due 30 days and over
Residential 1-4 family	2,841	3,233
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	552	297
Residential real estate	3,393	3,530
Commercial	4,442	6,106
Construction of commercial	258	258
Commercial real estate	4,700	6,364
Farm land	242	1,512
Vacant land		25
Real estate secured	8,335	11,431
Commercial and industrial	740	850
Municipal
Consumer	42	44
Loans receivable, gross	9,117	12,325
Accruing 90 days and over
Residential 1-4 family		236
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate		236
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured		236
Commercial and industrial	31	20
Municipal
Consumer
Loans receivable, gross	31	256
Non-accrual
Residential 1-4 family	2,045	1,920
Residential 5+ multifamily	151	163
Construction of residential 1-4 family
Home equity lines of credit	66	519
Residential real estate	2,262	2,602
Commercial	3,364	4,643
Construction of commercial	258	258
Commercial real estate	3,622	4,901
Farm land	250	1,002
Vacant land
Real estate secured	6,134	8,505
Commercial and industrial	470	27
Municipal
Consumer		4
Loans receivable, gross	$ 6,604	$ 8,536