LOANS - Composition of loans receivable by risk rating grade (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Pass
Residential 1-4 family	$ 324,483	$ 307,240
Residential 5+ multifamily	23,595	16,129
Construction of residential 1-4 family	12,035	11,197
Home equity lines of credit	33,086	32,891
Residential real estate	393,199	367,457
Commercial	258,580	232,492
Construction of commercial	11,182	9,622
Commercial real estate	269,762	242,114
Farm land	4,202	4,024
Vacant land	8,774	7,806
Real estate secured	675,937	621,401
Commercial and industrial	148,309	129,219
Municipal	18,608	17,494
Consumer	4,839	4,744
Loans receivable, gross	847,693	772,858
Special mention
Residential 1-4 family	6,049	6,452
Residential 5+ multifamily	1,172	957
Construction of residential 1-4 family
Home equity lines of credit	325	710
Residential real estate	7,546	8,119
Commercial	3,272	4,456
Construction of commercial
Commercial real estate	3,272	4,456
Farm land
Vacant land	73	77
Real estate secured	10,891	12,652
Commercial and industrial	1,710	2,536
Municipal
Consumer	28	50
Loans receivable, gross	12,629	15,238
Substandard
Residential 1-4 family	4,851	3,947
Residential 5+ multifamily	1,008	1,022
Construction of residential 1-4 family
Home equity lines of credit	519	170
Residential real estate	6,378	5,139
Commercial	10,543	12,363
Construction of commercial	362	366
Commercial real estate	10,905	12,729
Farm land	230	250
Vacant land
Real estate secured	17,513	18,118
Commercial and industrial	892	976
Municipal
Consumer
Loans receivable, gross	18,405	19,094
Doubtful
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
Municipal
Consumer
Loans receivable, gross
Loss
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
Municipal
Consumer
Loans receivable, gross
Total
Residential 1-4 family	335,383	317,639
Residential 5+ multifamily	25,775	18,108
Construction of residential 1-4 family	12,035	11,197
Home equity lines of credit	33,930	33,771
Residential real estate	407,123	380,715
Commercial	272,395	249,311
Construction of commercial	11,544	9,988
Commercial real estate	283,939	259,299
Farm land	4,432	4,274
Vacant land	8,847	7,883
Real estate secured	704,341	652,171
Commercial and industrial	150,911	132,731
Municipal	18,608	17,494
Consumer	4,867	4,794
Loans receivable, gross	$ 878,727	$ 807,190