LOANS AND SERVICING - Allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Allowance for loan losses
Beginning Balance			$ 2,408	$ 2,229
Charge-offs			(2)	(25)
Recoveries			4	4
(Benefit) provision	$ 67	$ 111	141	138
Ending Balance	2,551	2,346	2,551	2,346
Ending balance: Individually evaluated for impairment	7		7		$ 14
Ending balance: Collectively evaluated for impairment	2,544		2,544		2,394
Loans
Ending Balance: Individually evaluated for impairment	2,024		2,024		2,046
Ending Balance: Collectively evaluated for impairment	271,846		271,846		253,968
Total Loans	273,870		273,870		256,014
Residential loans:
Loans
Total Loans	105,140		105,140		104,735
One- to four- family, residential loans
Allowance for loan losses
Beginning Balance			197	273
(Benefit) provision			(28)	(72)
Ending Balance	169	201	169	201
Ending balance: Individually evaluated for impairment					7
Ending balance: Collectively evaluated for impairment	169		169		190
Loans
Ending Balance: Individually evaluated for impairment	1,554		1,554		1,567
Ending Balance: Collectively evaluated for impairment	87,652		87,652		84,905
Total Loans	89,206		89,206		86,472
Home equity loans and lines of credit
Allowance for loan losses
Beginning Balance			276	249
Recoveries			1	1
(Benefit) provision			(38)	30
Ending Balance	239	280	239	280
Ending balance: Collectively evaluated for impairment	239		239		276
Loans
Ending Balance: Individually evaluated for impairment	102		102		104
Ending Balance: Collectively evaluated for impairment	15,832		15,832		18,159
Total Loans	15,934		15,934		18,263
Commercial loans:
Loans
Total Loans	143,744		143,744		130,664
One-to-four family investment property
Allowance for loan losses
Beginning Balance			90	46
(Benefit) provision			(8)	27
Ending Balance	82	73	82	73
Ending balance: Individually evaluated for impairment	7		7		7
Ending balance: Collectively evaluated for impairment	75		75		83
Loans
Ending Balance: Individually evaluated for impairment	86		86		88
Ending Balance: Collectively evaluated for impairment	13,622		13,622		15,167
Total Loans	13,708		13,708		15,255
Multi-family real estate
Allowance for loan losses
Beginning Balance			233	113
(Benefit) provision			(20)	62
Ending Balance	213	175	213	175
Ending balance: Collectively evaluated for impairment	213		213		233
Loans
Ending Balance: Collectively evaluated for impairment	28,026		28,026		30,709
Total Loans	28,026		28,026		30,709
Commercial real estate
Allowance for loan losses
Beginning Balance			1,021	943
(Benefit) provision			213	65
Ending Balance	1,234	1,008	1,234	1,008
Ending balance: Collectively evaluated for impairment	1,234		1,234		1,021
Loans
Ending Balance: Individually evaluated for impairment	282		282		287
Ending Balance: Collectively evaluated for impairment	81,409		81,409		66,865
Total Loans	81,691		81,691		67,152
Commercial business loan
Allowance for loan losses
Beginning Balance			305	311
Charge-offs				(22)
(Benefit) provision			52	39
Ending Balance	357	328	357	328
Ending balance: Collectively evaluated for impairment	357		357		305
Loans
Ending Balance: Collectively evaluated for impairment	20,319		20,319		17,548
Total Loans	20,319		20,319		17,548
Construction loans
Loans
Total Loans	24,783		24,783		20,378
One-to-four family, construction loans
Allowance for loan losses
Beginning Balance			113	117
(Benefit) provision			1	12
Ending Balance	114	129	114	129
Ending balance: Collectively evaluated for impairment	114		114		113
Loans
Ending Balance: Collectively evaluated for impairment	13,459		13,459		12,967
Total Loans	13,459		13,459		12,967
Multi-family
Allowance for loan losses
Beginning Balance			12	97
(Benefit) provision			27	(31)
Ending Balance	39	66	39	66
Ending balance: Collectively evaluated for impairment	39		39		12
Loans
Ending Balance: Collectively evaluated for impairment	4,696		4,696		1,486
Total Loans	4,696		4,696		1,486
Non-residential
Allowance for loan losses
Beginning Balance			91	77
(Benefit) provision			11	7
Ending Balance	102	84	102	84
Ending balance: Collectively evaluated for impairment	102		102		91
Loans
Ending Balance: Collectively evaluated for impairment	6,628		6,628		5,925
Total Loans	6,628		6,628		5,925
Consumer
Allowance for loan losses
Beginning Balance			2	3
Charge-offs			(2)	(3)
Recoveries			3	3
(Benefit) provision			(1)	(1)
Ending Balance	2	$ 2	2	$ 2
Ending balance: Collectively evaluated for impairment	2		2		2
Loans
Ending Balance: Collectively evaluated for impairment	203		203		237
Total Loans	$ 203		203		237
Unallocated
Allowance for loan losses
Beginning Balance			68
(Benefit) provision			$ (68)
Ending balance: Collectively evaluated for impairment					$ 68