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LOANS - Geographic Concentrations Based on Unpaid Principal Balances (Details) - Residential mortgage loans - Geographic Concentration Risk | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
All Locations |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic Concentrations of Residential Mortgage Loans | 100.00% | 100.00%
California |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic Concentrations of Residential Mortgage Loans | 41.90% | 44.80%
New York |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic Concentrations of Residential Mortgage Loans | 10.30% | 10.30%
Florida |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic Concentrations of Residential Mortgage Loans | 10.10% | 8.30%
Texas |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic Concentrations of Residential Mortgage Loans | 5.40% | 5.10%
All other (none individually greater than 5%) |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic Concentrations of Residential Mortgage Loans | 32.30% | 31.50%

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