LOANS AND SERVICING - Internal Credit Assessment (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) grade person	Dec. 31, 2016 USD ($)
Loans by risk rating
Loans receivable	$ 281,669,000	$ 279,492,000
Internal Loan Rating System
Number of grades in internal loan rating system | grade	9
Number of people bound by the contract | person	1
Not formally rated
Loans by risk rating
Loans receivable	$ 106,559,000	104,305,000
Pass
Loans by risk rating
Loans receivable	$ 171,683,000	172,297,000
Pass | Minimum
Internal Loan Rating System
Grade assigned in internal loan rating system | grade	1
Pass | Maximum
Internal Loan Rating System
Grade assigned in internal loan rating system | grade	5
Special mention
Internal Loan Rating System
Grade assigned in internal loan rating system | grade	6
Substandard
Loans by risk rating
Loans receivable	$ 3,427,000	2,890,000
Internal Loan Rating System
Grade assigned in internal loan rating system | grade	7
Doubtful
Internal Loan Rating System
Grade assigned in internal loan rating system | grade	8
Loss
Loans by risk rating
Loans receivable	$ 281,669,000	279,492,000
Internal Loan Rating System
Grade assigned in internal loan rating system | grade	9
Residential loans:
Loans by risk rating
Loans receivable	$ 108,337,000	106,069,000
One- to four- family, residential loans
Loans by risk rating
Loans receivable	92,869,000	90,190,000
One- to four- family, residential loans | Not formally rated
Loans by risk rating
Loans receivable	91,216,000	88,522,000
One- to four- family, residential loans | Substandard
Loans by risk rating
Loans receivable	1,653,000	1,668,000
One- to four- family, residential loans | Loss
Loans by risk rating
Loans receivable	92,869,000	90,190,000
Home equity loans and lines of credit
Loans by risk rating
Loans receivable	15,468,000	15,879,000
Home equity loans and lines of credit | Not formally rated
Loans by risk rating
Loans receivable	15,193,000	15,601,000
Home equity loans and lines of credit | Substandard
Loans by risk rating
Loans receivable	275,000	278,000
Home equity loans and lines of credit | Loss
Loans by risk rating
Loans receivable	15,468,000	15,879,000
Commercial loans:
Loans by risk rating
Loans receivable	151,855,000	148,087,000
Commercial loans: | Minimum
Loans by risk rating
Loans receivable	150,000
Internal Loan Rating System
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	350,000
Commercial loans: | Pass | Maximum
Internal Loan Rating System
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	350,000
One-to-four family investment property
Loans by risk rating
Loans receivable	14,400,000	13,081,000
One-to-four family investment property | Pass
Loans by risk rating
Loans receivable	14,315,000	12,996,000
One-to-four family investment property | Substandard
Loans by risk rating
Loans receivable	85,000	85,000
One-to-four family investment property | Loss
Loans by risk rating
Loans receivable	14,400,000	13,081,000
Multi-family real estate
Loans by risk rating
Loans receivable	30,214,000	30,748,000
Multi-family real estate | Pass
Loans by risk rating
Loans receivable	30,214,000	30,748,000
Multi-family real estate | Loss
Loans by risk rating
Loans receivable	30,214,000	30,748,000
Commercial real estate
Loans by risk rating
Loans receivable	83,390,000	83,583,000
Commercial real estate | Pass
Loans by risk rating
Loans receivable	82,360,000	82,873,000
Commercial real estate | Substandard
Loans by risk rating
Loans receivable	1,030,000	710,000
Commercial real estate | Loss
Loans by risk rating
Loans receivable	83,390,000	83,583,000
Commercial business loan
Loans by risk rating
Loans receivable	23,851,000	20,675,000
Commercial business loan | Pass
Loans by risk rating
Loans receivable	23,467,000	20,526,000
Commercial business loan | Substandard
Loans by risk rating
Loans receivable	384,000	149,000
Commercial business loan | Loss
Loans by risk rating
Loans receivable	23,851,000	20,675,000
Construction loans
Loans by risk rating
Loans receivable	21,327,000	25,154,000
Construction loans | Minimum
Internal Loan Rating System
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	350,000
One-to-four family, construction loans
Loans by risk rating
Loans receivable	9,368,000	12,599,000
One-to-four family, construction loans | Pass
Loans by risk rating
Loans receivable	9,368,000	12,599,000
One-to-four family, construction loans | Loss
Loans by risk rating
Loans receivable	9,368,000	12,599,000
Multi-family
Loans by risk rating
Loans receivable	4,505,000	5,725,000
Multi-family | Pass
Loans by risk rating
Loans receivable	4,505,000	5,725,000
Multi-family | Loss
Loans by risk rating
Loans receivable	4,505,000	5,725,000
Non-residential
Loans by risk rating
Loans receivable	7,454,000	6,830,000
Non-residential | Pass
Loans by risk rating
Loans receivable	7,454,000	6,830,000
Non-residential | Loss
Loans by risk rating
Loans receivable	7,454,000	6,830,000
Consumer
Loans by risk rating
Loans receivable	150,000	182,000
Consumer | Not formally rated
Loans by risk rating
Loans receivable	150,000	182,000
Consumer | Loss
Loans by risk rating
Loans receivable	$ 150,000	$ 182,000