SECURITIES - Summary of Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 1,670,439	$ 2,053,585
Amortized Cost Basis	608,439	707,372
Gross Unrealized Gains	144	1,500
Gross Unrealized Losses	(21,163)	(5,572)
Carrying value, before allowance for credit loss	$ 587,420	$ 703,300
Number of Securities | security	106	102
Weighted Average Coupon	2.06%	0.83%
Weighted Average Yield	5.29%	1.67%
Remaining Duration	1 year 25 days	2 years 21 days
Amortized Cost Basis	$ 160
Gross Unrealized Gains	0
Gross Unrealized Losses	(41)
Carrying Value	$ 119
Number of equity securities | security	1
Allowance for current expected credit losses	$ (20)	$ (20)
Total Amortized Cost Basis	608,599	707,372
Total Gross Unrealized Gains	144	1,500
Total real estate securities, Gross Unrealized Losses	(21,224)	$ (5,592)
Carrying Value	$ 587,519
Total number of Securities | security	107	102
CMBS
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 562,839	$ 691,402
Amortized Cost Basis	562,246	691,026
Gross Unrealized Gains	0	775
Gross Unrealized Losses	(20,913)	(5,508)
Carrying value, before allowance for credit loss	$ 541,333	$ 686,293
Number of Securities | security	71	73
Weighted Average Coupon	5.22%	1.57%
Weighted Average Yield	5.32%	1.57%
Remaining Duration	1 year 21 days	2 years 21 days
Risk retention requirement, amount	$ 9,000	$ 9,900
CMBS interest-only
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	1,026,195	1,302,551
Amortized Cost Basis	10,498	15,268
Gross Unrealized Gains	121	617
Gross Unrealized Losses	(176)	0
Carrying value, before allowance for credit loss	$ 10,443	$ 15,885
Number of Securities | security	10	13
Weighted Average Coupon	0.41%	0.45%
Weighted Average Yield	3.65%	5.67%
Remaining Duration	1 year 5 months 12 days	1 year 10 months 17 days
Risk retention requirement, amount	$ 400	$ 500
GNMA interest-only
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	45,369	59,075
Amortized Cost Basis	285	518
Gross Unrealized Gains	17	105
Gross Unrealized Losses	(21)	(64)
Carrying value, before allowance for credit loss	$ 281	$ 559
Number of Securities | security	14	14
Weighted Average Coupon	0.31%	0.38%
Weighted Average Yield	4.23%	4.97%
Remaining Duration	3 years 3 months 18 days	3 years 7 months 20 days
Agency securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 36	$ 557
Amortized Cost Basis	36	560
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(1)	0
Carrying value, before allowance for credit loss	$ 35	$ 563
Number of Securities | security	1	2
Weighted Average Coupon	4.00%	2.47%
Weighted Average Yield	2.70%	1.58%
Remaining Duration	1 year 6 months 14 days	8 months 8 days
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 36,000
Amortized Cost Basis	35,374
Gross Unrealized Gains	6
Gross Unrealized Losses	(52)
Carrying value, before allowance for credit loss	$ 35,328
Number of Securities | security	10
Weighted Average Yield	4.17%
Remaining Duration	7 months 6 days