BORROWINGS AND RELATED INTEREST (Advances from the Federal Home Loan Bank of New York) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Additional borrowing capacity	$ 457,500	$ 446,000
Weighted average period remaining maturity of FHLB advances	11 months	1 year 2 months 12 days
Advances from the Federal Home Loan Bank
Debt Instrument [Line Items]
Minimum amount of qualifying collateral	110.00%
Accrued interest payable	$ 766	$ 768
Advances from the Federal Home Loan Bank \| Long-Term Fixed-Rate Advances from FHLB
Debt Instrument [Line Items]
Original debt instrument term of FHLB advances	2 years
Advances from the Federal Home Loan Bank \| Asset Pledged as Collateral
Debt Instrument [Line Items]
Total loans	$ 984,400	$ 1,000,000

Weighted average maturity (weighted by amount of the agreement) of FHLB advances.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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