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LOANS - Geographic Concentrations Based on Unpaid Principal Balances (Details) - Residential mortgage loans - Geographic Concentration Risk | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
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 | 40.10% | 44.80%
Florida |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic concentrations of residential mortgage loans | 10.60% | 8.30%
New York |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic concentrations of residential mortgage loans | 10.50% | 10.30%
Texas |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Geographic concentrations of residential mortgage loans | 5.60% | 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 | 33.20% | 31.50%

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