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COMMERCIAL MORTGAGE LOANS HELD-FOR-INVESTMENT - Summary of Concentration of Credit Risk (Details) - Commercial Loans Held-For-Investment - Commercial Real Estate Portfolio Segment | 3 Months Ended | 12 Months Ended
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Mar. 31, 2026 | Dec. 31, 2025
Geography |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 100.00% | 100.00%
Collateral Property Type |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 100.00% | 100.00%
Multifamily | Collateral Property Type |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 92.60% | 92.60%
Seniors Housing and Healthcare | Collateral Property Type |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 7.40% | 7.40%
South | Geography |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 32.60% | 32.40%
Southwest | Geography |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 22.80% | 26.20%
Mid-Atlantic | Geography |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 20.00% | 16.90%
Midwest | Geography |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 15.20% | 13.90%
West | Geography |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk, percent | 9.40% | 10.60%

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