LOANS - Composition of loans receivable by delinquency status (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current
Residential 1-4 family	$ 320,999	$ 314,798
Residential 5+ multifamily	23,557	18,108
Construction of residential 1-4 family	11,451	11,197
Home equity lines of credit	33,015	33,219
Residential real estate	389,022	377,322
Commercial	257,734	244,869
Construction of commercial	10,480	9,730
Commercial real estate	268,214	254,599
Farm land	4,366	4,032
Vacant land	7,945	7,883
Real estate secured	669,547	643,836
Commercial and industrial	136,640	131,991
Municipal	17,994	17,494
Consumer	4,513	4,752
Loans receivable, gross	828,694	798,073
Past due 30-59 days
Residential 1-4 family	622	1,410
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	71	75
Residential real estate	693	1,485
Commercial	1,434	1,888
Construction of commercial
Commercial real estate	1,434	1,888
Farm land		242
Vacant land
Real estate secured	2,127	3,615
Commercial and industrial	240	131
Municipal
Consumer	6	34
Loans receivable, gross	2,373	3,780
Past due 60-89 days
Residential 1-4 family	716	165
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	42	477
Residential real estate	758	642
Commercial	548	758
Construction of commercial
Commercial real estate	548	758
Farm land
Vacant land
Real estate secured	1,306	1,400
Commercial and industrial	51	218
Municipal
Consumer		8
Loans receivable, gross	1,357	1,626
Past due 90-179 days
Residential 1-4 family		156
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	34
Residential real estate	34	156
Commercial	1,088
Construction of commercial
Commercial real estate	1,088
Farm land
Vacant land
Real estate secured	1,122	156
Commercial and industrial		391
Municipal
Consumer
Loans receivable, gross	1,122	547
Past due 180 days and over
Residential 1-4 family	1,088	1,110
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	1,088	1,110
Commercial	796	1,796
Construction of commercial	257	258
Commercial real estate	1,053	2,054
Farm land
Vacant land
Real estate secured	2,141	3,164
Commercial and industrial	360
Municipal
Consumer
Loans receivable, gross	2,501	3,164
Past due 30 days and over
Residential 1-4 family	2,426	2,841
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	147	552
Residential real estate	2,573	3,393
Commercial	3,866	4,442
Construction of commercial	257	258
Commercial real estate	4,123	4,700
Farm land		242
Vacant land
Real estate secured	6,696	8,335
Commercial and industrial	651	740
Municipal
Consumer	6	42
Loans receivable, gross	7,353	9,117
Past due Accruing 90 days and over
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	34
Residential real estate	34
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured	34
Commercial and industrial		31
Municipal
Consumer
Loans receivable, gross	34	31
Non-accrual
Residential 1-4 family	2,001	2,045
Residential 5+ multifamily	147	151
Construction of residential 1-4 family
Home equity lines of credit	63	66
Residential real estate	2,211	2,262
Commercial	1,884	3,364
Construction of commercial	257	258
Commercial real estate	2,141	3,622
Farm land	241	250
Vacant land
Real estate secured	4,593	6,134
Commercial and industrial	467	470
Municipal
Consumer
Loans receivable, gross	$ 5,060	$ 6,604