LOANS RECEIVABLE - Aging analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total	$ 1,550,983	$ 1,560,730
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	5,132	5,653
Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	629	887
Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	575	752
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	3,928	4,014
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	1,545,851	1,555,077
Residential Portfolio Segment | Residential
Financing Receivable, Past Due [Line Items]
Total	516,754	550,929
Residential Portfolio Segment | Residential | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	4,967	5,565
Residential Portfolio Segment | Residential | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	629	887
Residential Portfolio Segment | Residential | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	425	752
Residential Portfolio Segment | Residential | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	3,913	3,926
Residential Portfolio Segment | Residential | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	511,787	545,364
Residential Portfolio Segment | Multifamily
Financing Receivable, Past Due [Line Items]
Total	666,304	682,564
Residential Portfolio Segment | Multifamily | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential Portfolio Segment | Multifamily | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential Portfolio Segment | Multifamily | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential Portfolio Segment | Multifamily | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Residential Portfolio Segment | Multifamily | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	666,304	682,564
Commercial Real Estate Portfolio Segment | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	241,711	232,505
Commercial Real Estate Portfolio Segment | Commercial real estate | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Real Estate Portfolio Segment | Commercial real estate | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Real Estate Portfolio Segment | Commercial real estate | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Real Estate Portfolio Segment | Commercial real estate | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Real Estate Portfolio Segment | Commercial real estate | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	241,711	232,505
Construction and Land Portfolio Segment | Construction
Financing Receivable, Past Due [Line Items]
Total	80,081	60,414
Construction and Land Portfolio Segment | Construction | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Construction and Land Portfolio Segment | Construction | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Construction and Land Portfolio Segment | Construction | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Construction and Land Portfolio Segment | Construction | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Construction and Land Portfolio Segment | Construction | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	80,081	60,414
Junior Lien Portfolio Segment | Junior liens
Financing Receivable, Past Due [Line Items]
Total	24,174	22,503
Junior Lien Portfolio Segment | Junior liens | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	150	49
Junior Lien Portfolio Segment | Junior liens | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Junior Lien Portfolio Segment | Junior liens | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	150	0
Junior Lien Portfolio Segment | Junior liens | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	49
Junior Lien Portfolio Segment | Junior liens | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	24,024	22,454
Commercial Portfolio Segment | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	14,228	11,768
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	15	39
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	15	39
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	14,213	11,729
Consumer and Other Portfolio Segment | Consumer and other
Financing Receivable, Past Due [Line Items]
Total	7,731	47
Consumer and Other Portfolio Segment | Consumer and other | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Consumer and Other Portfolio Segment | Consumer and other | Financial Asset, 30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Consumer and Other Portfolio Segment | Consumer and other | Financial Asset, 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Consumer and Other Portfolio Segment | Consumer and other | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	0	0
Consumer and Other Portfolio Segment | Consumer and other | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Total	$ 7,731	$ 47