LOANS - Composition of loans receivable by delinquency status (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current
Residential 1-4 family	$ 344,342	$ 314,798
Residential 5+ multifamily	29,828	18,108
Construction of residential 1-4 family	13,125	11,197
Home equity lines of credit	34,357	33,219
Residential real estate	421,652	377,322
Commercial	277,924	244,869
Construction of commercial	10,428	9,730
Commercial real estate	288,352	254,599
Farm land	4,005	4,032
Vacant land	8,726	7,883
Real estate secured	722,735	643,836
Commercial and industrial	150,176	131,991
Municipal	18,388	17,494
Consumer	4,584	4,752
Loans receivable, gross	895,883	798,073
Past due 30-59 days
Residential 1-4 family	909	1,410
Residential 5+ multifamily	658
Construction of residential 1-4 family
Home equity lines of credit	107	75
Residential real estate	1,674	1,485
Commercial	774	1,888
Construction of commercial
Commercial real estate	774	1,888
Farm land	217	242
Vacant land
Real estate secured	2,665	3,615
Commercial and industrial	53	131
Municipal
Consumer	11	34
Loans receivable, gross	2,729	3,780
Past due 60-89 days
Residential 1-4 family	32	165
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	40	477
Residential real estate	72	642
Commercial	179	758
Construction of commercial
Commercial real estate	179	758
Farm land
Vacant land
Real estate secured	251	1,400
Commercial and industrial	30	218
Municipal
Consumer	10	8
Loans receivable, gross	291	1,626
Past due 90-179 days
Residential 1-4 family	1,511	156
Residential 5+ multifamily	229
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate	1,740	156
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured	1,740	156
Commercial and industrial	96	391
Municipal
Consumer
Loans receivable, gross	1,836	547
Past due 180 days and over
Residential 1-4 family	1,424	1,110
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	359
Residential real estate	1,783	1,110
Commercial	1,763	1,796
Construction of commercial	257	258
Commercial real estate	2,020	2,054
Farm land
Vacant land
Real estate secured	3,803	3,164
Commercial and industrial	360
Municipal
Consumer
Loans receivable, gross	4,163	3,164
Past due 30 days and over
Residential 1-4 family	3,876	2,841
Residential 5+ multifamily	887
Construction of residential 1-4 family
Home equity lines of credit	506	552
Residential real estate	5,269	3,393
Commercial	2,716	4,442
Construction of commercial	257	258
Commercial real estate	2,973	4,700
Farm land	217	242
Vacant land
Real estate secured	8,459	8,335
Commercial and industrial	539	740
Municipal
Consumer	21	42
Loans receivable, gross	9,019	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
Residential real estate
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured
Commercial and industrial	96	31
Municipal
Consumer
Loans receivable, gross	96	31
Non-accrual
Residential 1-4 family	3,599	2,045
Residential 5+ multifamily	1,003	151
Construction of residential 1-4 family
Home equity lines of credit	413	66
Residential real estate	5,015	2,262
Commercial	2,221	3,364
Construction of commercial	257	258
Commercial real estate	2,478	3,622
Farm land	224	250
Vacant land
Real estate secured	7,717	6,134
Commercial and industrial	360	470
Municipal
Consumer
Loans receivable, gross	$ 8,077	$ 6,604