LOANS AND SERVICING - Past-due and non-accrual loans (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Past-due and non-accrual loans
Past due loans	$ 939	$ 1,017
Total Current	280,730	278,475
Total Loans	281,669	279,492
Non-accrual Loans	937	953
Loans delinquent for: 30 - 59 Days
Past-due and non-accrual loans
Past due loans	40	198
Loans delinquent for: 60 - 89 Days
Past-due and non-accrual loans
Past due loans	157	23
Loans delinquent for: 90 days or more
Past-due and non-accrual loans
Past due loans	742	796
Residential loans:
Past-due and non-accrual loans
Total Loans	108,337	106,069
One- to four- family, residential loans
Past-due and non-accrual loans
Past due loans	742	755
Total Current	92,127	89,435
Total Loans	92,869	90,190
Non-accrual Loans	742	755
One- to four- family, residential loans | Loans delinquent for: 90 days or more
Past-due and non-accrual loans
Past due loans	742	755
Home equity loans and lines of credit
Past-due and non-accrual loans
Past due loans	197	252
Total Current	15,271	15,627
Total Loans	15,468	15,879
Non-accrual Loans	195	198
Home equity loans and lines of credit | Loans delinquent for: 30 - 59 Days
Past-due and non-accrual loans
Past due loans	40	191
Home equity loans and lines of credit | Loans delinquent for: 60 - 89 Days
Past-due and non-accrual loans
Past due loans	157	20
Home equity loans and lines of credit | Loans delinquent for: 90 days or more
Past-due and non-accrual loans
Past due loans		41
Commercial loans:
Past-due and non-accrual loans
Total Loans	151,855	148,087
One-to-four family investment property
Past-due and non-accrual loans
Total Current	14,400	13,081
Total Loans	14,400	13,081
Multi-family real estate
Past-due and non-accrual loans
Total Current	30,214	30,748
Total Loans	30,214	30,748
Commercial real estate
Past-due and non-accrual loans
Total Current	83,390	83,583
Total Loans	83,390	83,583
Commercial business loan
Past-due and non-accrual loans
Total Current	23,851	20,675
Total Loans	23,851	20,675
Construction loans
Past-due and non-accrual loans
Total Loans	21,327	25,154
One-to-four family, construction loans
Past-due and non-accrual loans
Total Current	9,368	12,599
Total Loans	9,368	12,599
Multi-family
Past-due and non-accrual loans
Total Current	4,505	5,725
Total Loans	4,505	5,725
Non-residential
Past-due and non-accrual loans
Total Current	7,454	6,830
Total Loans	7,454	6,830
Consumer
Past-due and non-accrual loans
Past due loans		10
Total Current	150	172
Total Loans	$ 150	182
Consumer | Loans delinquent for: 30 - 59 Days
Past-due and non-accrual loans
Past due loans		7
Consumer | Loans delinquent for: 60 - 89 Days
Past-due and non-accrual loans
Past due loans		$ 3