LOANS RECEIVABLE - Loan modifications made by payment status (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified	$ 0	$ 2,282	$ 1,496
Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		2,282	1,496
Financial Asset, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		0	0
Financial Asset, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		0	0
Residential Portfolio Segment | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		2,282	795
Residential Portfolio Segment | Residential | Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		2,282	795
Residential Portfolio Segment | Residential | Financial Asset, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		0	0
Residential Portfolio Segment | Residential | Financial Asset, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		0	0
Residential Portfolio Segment | Residential | Financial Asset, Equal to or Greater than 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified		$ 0	0
Commercial Portfolio Segment | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified			701
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified			701
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, 30 to 59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified			0
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, 60 to 89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified			0
Commercial Portfolio Segment | Commercial and industrial | Financial Asset, Equal to or Greater than 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans modified			$ 0