LOANS AND SERVICING - Past-due and non-accrual loans (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Past-due and non-accrual loans
Past due loans	$ 1,121	$ 938
Total Current	272,749	255,076
Total Loans	273,870	256,014
Non-accrual Loans	964	776
Loans delinquent for: 30 - 59 Days
Past-due and non-accrual loans
Past due loans	314	285
Loans delinquent for: 60 - 89 Days
Past-due and non-accrual loans
Past due loans		4
Loans delinquent for: 90 days or more
Past-due and non-accrual loans
Past due loans	807	649
Residential loans:
Past-due and non-accrual loans
Total Loans	105,140	104,735
One- to four- family, residential loans
Past-due and non-accrual loans
Past due loans	766	649
Total Current	88,440	85,823
Total Loans	89,206	86,472
Non-accrual Loans	766	776
One- to four- family, residential loans | Loans delinquent for: 90 days or more
Past-due and non-accrual loans
Past due loans	766	649
Home equity loans and lines of credit
Past-due and non-accrual loans
Past due loans	355	273
Total Current	15,579	17,990
Total Loans	15,934	18,263
Non-accrual Loans	198
Home equity loans and lines of credit | Loans delinquent for: 30 - 59 Days
Past-due and non-accrual loans
Past due loans	314	273
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	143,744	130,664
One-to-four family investment property
Past-due and non-accrual loans
Total Current	13,708	15,255
Total Loans	13,708	15,255
Multi-family real estate
Past-due and non-accrual loans
Total Current	28,026	30,709
Total Loans	28,026	30,709
Commercial real estate
Past-due and non-accrual loans
Total Current	81,691	67,152
Total Loans	81,691	67,152
Commercial business loan
Past-due and non-accrual loans
Past due loans		12
Total Current	20,319	17,536
Total Loans	20,319	17,548
Commercial business loan | Loans delinquent for: 30 - 59 Days
Past-due and non-accrual loans
Past due loans		12
Construction loans
Past-due and non-accrual loans
Total Loans	24,783	20,378
One-to-four family, construction loans
Past-due and non-accrual loans
Total Current	13,459	12,967
Total Loans	13,459	12,967
Multi-family
Past-due and non-accrual loans
Total Current	4,696	1,486
Total Loans	4,696	1,486
Non-residential
Past-due and non-accrual loans
Total Current	6,628	5,925
Total Loans	6,628	5,925
Consumer
Past-due and non-accrual loans
Past due loans		4
Total Current	203	233
Total Loans	$ 203	237
Consumer | Loans delinquent for: 60 - 89 Days
Past-due and non-accrual loans
Past due loans		$ 4