LOANS - Composition of loans receivable and loans held-for-sale (Details) - Total - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Residential 1-4 family	$ 348,218	$ 317,639
Residential 5+ multifamily	30,715	18,108
Construction of residential 1-4 family	13,125	11,197
Home equity lines of credit	34,863	33,771
Residential real estate	426,921	380,715
Commercial	280,640	249,311
Construction of commercial	10,685	9,988
Commercial real estate	291,325	259,299
Farm land	4,222	4,274
Vacant land	8,726	7,883
Real estate secured	731,194	652,171
Commercial and industrial	150,715	132,731
Municipal	18,388	17,494
Consumer	4,605	4,794
Loans receivable, gross	904,902	807,190
Deferred loan origination fees and costs, net	1,468	1,289
Allowance for loan losses	(7,745)	(6,776)
Loans receivable, net	898,625	801,703
Loans held-for-sale
Residential 1-4 family	$ 589	$ 669