LOANS - Composition of loans receivable by risk rating grade (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Pass
Residential 1-4 family	$ 313,049	$ 307,240
Residential 5+ multifamily	21,610	16,129
Construction of residential 1-4 family	11,451	11,197
Home equity lines of credit	32,298	32,891
Residential real estate	378,408	367,457
Commercial	246,598	232,492
Construction of commercial	10,373	9,622
Commercial real estate	256,971	242,114
Farm land	4,125	4,024
Vacant land	7,870	7,806
Real estate secured	647,374	621,401
Commercial and industrial	134,025	129,219
Municipal	17,994	17,494
Consumer	4,486	4,744
Loans receivable, gross	803,879	772,858
Special mention
Residential 1-4 family	5,956	6,452
Residential 5+ multifamily	933	957
Construction of residential 1-4 family
Home equity lines of credit	339	710
Residential real estate	7,228	8,119
Commercial	4,257	4,456
Construction of commercial
Commercial real estate	4,257	4,456
Farm land
Vacant land	75	77
Real estate secured	11,560	12,652
Commercial and industrial	2,525	2,536
Municipal
Consumer	33	50
Loans receivable, gross	14,118	15,238
Substandard
Residential 1-4 family	4,420	3,947
Residential 5+ multifamily	1,014	1,022
Construction of residential 1-4 family
Home equity lines of credit	525	170
Residential real estate	5,959	5,139
Commercial	10,745	12,363
Construction of commercial	364	366
Commercial real estate	11,109	12,729
Farm land	241	250
Vacant land
Real estate secured	17,309	18,118
Commercial and industrial	741	976
Municipal
Consumer
Loans receivable, gross	18,050	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	323,425	317,639
Residential 5+ multifamily	23,557	18,108
Construction of residential 1-4 family	11,451	11,197
Home equity lines of credit	33,162	33,771
Residential real estate	391,595	380,715
Commercial	261,600	249,311
Construction of commercial	10,737	9,988
Commercial real estate	272,337	259,299
Farm land	4,366	4,274
Vacant land	7,945	7,883
Real estate secured	676,243	652,171
Commercial and industrial	137,291	132,731
Municipal	17,994	17,494
Consumer	4,519	4,794
Loans receivable, gross	$ 836,047	$ 807,190