LOANS HELD FOR INVESTMENT - Loans held for Investments (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans held for investment	$ 2,605,893	$ 2,414,383
Outstanding Principal	$ 2,625,448	$ 2,429,112
Weighted Average Unleveraged Effective Yield, Including Non-accrual Loans	6.20%	5.40%
Weighted Average Unleveraged Effective Yield, Excluding Non-accrual Loans	6.30%	5.50%
Weighted Average Remaining Life (Years)	1 year 7 months 6 days	1 year 7 months 6 days
Senior mortgage loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans held for investment	$ 2,588,834	$ 2,397,655
Outstanding Principal	$ 2,607,786	$ 2,411,718
Weighted Average Unleveraged Effective Yield, Including Non-accrual Loans	6.20%	5.30%
Weighted Average Unleveraged Effective Yield, Excluding Non-accrual Loans	6.30%	5.40%
Weighted Average Remaining Life (Years)	1 year 6 months	1 year 6 months
Subordinated debt and preferred equity investments
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans held for investment	$ 17,059	$ 16,728
Outstanding Principal	$ 17,662	$ 17,394
Weighted Average Unleveraged Effective Yield, Including Non-accrual Loans	13.70%	13.70%
Weighted Average Unleveraged Effective Yield, Excluding Non-accrual Loans	13.70%	13.70%
Weighted Average Remaining Life (Years)	3 years 6 months	4 years