LOANS RECEIVABLE, NET - Aging analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 1,560,730	$ 1,545,127
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	887	0
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	752	845
90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,014	7,068
Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,653	7,913
Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,555,077	1,537,214
Residential Portfolio Segment | Residential one-to-four family
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	550,929	597,254
Residential Portfolio Segment | Residential one-to-four family | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	887	0
Residential Portfolio Segment | Residential one-to-four family | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	752	845
Residential Portfolio Segment | Residential one-to-four family | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,926	6,738
Residential Portfolio Segment | Residential one-to-four family | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,565	7,583
Residential Portfolio Segment | Residential one-to-four family | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	545,364	589,671
Residential Portfolio Segment | Multifamily
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	682,564	690,690
Residential Portfolio Segment | Multifamily | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Residential Portfolio Segment | Multifamily | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Residential Portfolio Segment | Multifamily | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	182
Residential Portfolio Segment | Multifamily | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	182
Residential Portfolio Segment | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	682,564	690,508
Non-residential | Non-residential
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	232,505	216,061
Non-residential | Non-residential | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Non-residential | Non-residential | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Non-residential | Non-residential | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Non-residential | Non-residential | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Non-residential | Non-residential | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	232,505	216,061
Construction | Construction
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	60,414	17,799
Construction | Construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Construction | Construction | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Construction | Construction | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Construction | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Construction | Construction | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	60,414	17,799
Junior liens | Junior liens
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	22,503	18,631
Junior liens | Junior liens | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Junior liens | Junior liens | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Junior liens | Junior liens | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	49	52
Junior liens | Junior liens | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	49	52
Junior liens | Junior liens | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	22,454	18,579
Construction | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	11,768	4,653
Construction | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Construction | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Construction | Commercial and industrial | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	39	96
Construction | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	39	96
Construction | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	11,729	4,557
Consumer and other | Consumer and other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	47	39
Consumer and other | Consumer and other | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Consumer and other | Consumer and other | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Consumer and other | Consumer and other | 90 Days and Greater Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Consumer and other | Consumer and other | Total Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	0	0
Consumer and other | Consumer and other | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 47	$ 39