LOANS RECEIVABLE, NET - Summary of risk category of loans by class of loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	$ 1,560,730	$ 1,545,127
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		1,534,434
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		2,224
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		8,469
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Residential Portfolio Segment | Residential one-to-four family
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	550,929	597,254
Residential Portfolio Segment | Residential one-to-four family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		589,137
Residential Portfolio Segment | Residential one-to-four family | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		247
Residential Portfolio Segment | Residential one-to-four family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		7,870
Residential Portfolio Segment | Residential one-to-four family | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Non-residential | Non-residential
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	232,505	216,061
Non-residential | Non-residential | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		214,981
Non-residential | Non-residential | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		1,080
Non-residential | Non-residential | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Non-residential | Non-residential | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Construction | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	60,414	17,799
Construction | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		17,799
Construction | Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Construction | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Construction | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Junior liens | Junior liens
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	22,503	18,631
Junior liens | Junior liens | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		18,579
Junior liens | Junior liens | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Junior liens | Junior liens | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		52
Junior liens | Junior liens | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Consumer and other | Consumer and other
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable	$ 47	39
Consumer and other | Consumer and other | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		8
Consumer and other | Consumer and other | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		0
Consumer and other | Consumer and other | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		31
Consumer and other | Consumer and other | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans Receivable		$ 0