COMMERCIAL LOANS AND INVESTMENTS - Summary - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Construction Loan, Mixed-Use Development, Lake Toxaway, North Carolina
Commercial Loans and Investments
Coupon rate (as a percent)	16.00%	16.00%
Cash interest rate (as a percent)	13.00%	13.00%
Paid-in-kind interest rate (as a percent)	3.00%	3.00%
Construction Loan, Retail Development, Covington, Georgia
Commercial Loans and Investments
Coupon rate (as a percent)	13.00%
Cash interest rate (as a percent)	11.50%
Paid-in-kind interest rate (as a percent)	1.50%
Mortgage Note, Luxury Residential Development, Austin, Texas
Commercial Loans and Investments
Mortgage loans on real estate, face amount of mortgages, net of participating mortgage loans, mortgage obligations, amount	$ 41.2	$ 18.6
Coupon rate (as a percent)	16.00%	17.00%
Cash interest rate (as a percent)	12.00%	13.00%
Paid-in-kind interest rate (as a percent)	4.00%	4.00%
Mortgage Note, Mixed-Use Development, Herndon, Virginia
Commercial Loans and Investments
Coupon rate (as a percent)	12.00%	12.00%
Cash interest rate (as a percent)	10.00%	10.00%
Paid-in-kind interest rate (as a percent)	2.00%	2.00%
Redevelopment Loan, Mixed-Use Redevelopment, Denver, Colorado
Commercial Loans and Investments
Coupon rate (as a percent)	12.00%	12.00%
Cash interest rate (as a percent)	9.00%	9.00%
Paid-in-kind interest rate (as a percent)	3.00%	3.00%