LOANS - Composition of loans receivable and loans held-for-sale (Details) - Total - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Residential 1-4 family	$ 317,639	$ 301,128
Residential 5+ multifamily	18,108	13,625
Construction of residential 1-4 family	11,197	10,951
Home equity lines of credit	33,771	35,487
Residential real estate	380,715	361,191
Commercial	249,311	235,482
Construction of commercial	9,988	5,398
Commercial real estate	259,299	240,880
Farm land	4,274	3,914
Vacant land	7,883	6,600
Real estate secured	652,171	612,585
Commercial and industrial	132,731	141,473
Municipal	17,494	8,626
Consumer	4,794	5,380
Loans receivable, gross	807,190	768,064
Deferred loan origination fees and costs, net	1,289	1,247
Allowance for loan losses	(6,776)	(6,127)
Loans receivable, net	801,703	763,184
Loans held-for-sale
Residential 1-4 family	$ 669