SECURITIES - Summary of Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 1,407,340	$ 1,670,439
Amortized Cost Basis	499,389	608,439
Gross Unrealized Gains	565	144
Gross Unrealized Losses	(14,545)	(21,163)
Carrying value, before allowance for credit loss	$ 485,409	$ 587,420
# of Securities | security	95	106
Weighted Average Coupon	2.55%	2.06%
Weighted Average Yield	6.82%	5.29%
Remaining Duration (years)	1 year 11 months 23 days	1 year 25 days
Amortized Cost Basis	$ 160
Gross Unrealized Gains	0
Gross Unrealized Losses	(16)
Carrying Value	$ 144	$ 119
# of Securities | security	1	1
Allowance for current expected credit losses	$ (20)	$ (20)
Total Amortized Cost Basis	499,549	608,599
Total Gross Unrealized Gains	565	144
Total real estate securities, Gross Unrealized Losses	(14,581)	(21,224)
Carrying Value	$ 485,533	$ 587,519
Total number of Securities | security	96	107
CMBS
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 439,679	$ 562,839
Amortized Cost Basis	439,052	562,246
Gross Unrealized Gains	277	0
Gross Unrealized Losses	(14,439)	(20,913)
Carrying value, before allowance for credit loss	$ 424,890	$ 541,333
# of Securities | security	64	71
Weighted Average Coupon	6.67%	5.22%
Weighted Average Yield	6.83%	5.32%
Remaining Duration (years)	2 years	1 year 21 days
Risk retention requirement, amount	$ 9,000	$ 9,000
CMBS interest-only
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	876,555	1,026,195
Amortized Cost Basis	6,453	10,498
Gross Unrealized Gains	169	121
Gross Unrealized Losses	(53)	(176)
Carrying value, before allowance for credit loss	$ 6,569	$ 10,443
# of Securities | security	9	10
Weighted Average Coupon	0.57%	0.41%
Weighted Average Yield	6.61%	3.65%
Remaining Duration (years)	1 year 25 days	1 year 5 months 12 days
Risk retention requirement, amount	$ 300	$ 400
GNMA interest-only
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	37,053	45,369
Amortized Cost Basis	214	285
Gross Unrealized Gains	51	17
Gross Unrealized Losses	(52)	(21)
Carrying value, before allowance for credit loss	$ 213	$ 281
# of Securities | security	14	14
Weighted Average Coupon	0.36%	0.31%
Weighted Average Yield	6.12%	4.23%
Remaining Duration (years)	3 years 7 months 6 days	3 years 3 months 18 days
Agency securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 22	$ 36
Amortized Cost Basis	22	36
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(1)
Carrying value, before allowance for credit loss	$ 21	$ 35
# of Securities | security	1	1
Weighted Average Coupon	4.00%	4.00%
Weighted Average Yield	2.70%	2.70%
Remaining Duration (years)	1 year 18 days	1 year 6 months 14 days
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 54,031	$ 36,000
Amortized Cost Basis	53,648	35,374
Gross Unrealized Gains	68	6
Gross Unrealized Losses	0	(52)
Carrying value, before allowance for credit loss	$ 53,716	$ 35,328
# of Securities | security	7	10
Weighted Average Yield	5.41%	4.17%
Remaining Duration (years)	25 days	7 months 6 days
Class A Common Stock
Debt Securities, Available-for-sale [Line Items]
Amortized Cost Basis		$ 160
Gross Unrealized Gains		0
Gross Unrealized Losses		$ (41)