REAL ESTATE AND OTHER SECURITIES - Summary of Real Estate Securities in an Unrealized Loss Position (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 25,370,934	$ 24,314,300
Weighted Average Life (Years)	1 year 2 months 12 days
Less than 12 Months
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 408,191
Before Impairment - Amortized Cost Basis	390,591
Credit Impairment - Amortized Cost Basis	(10,816)
After Credit Impairment - Amortized Cost Basis	379,775
Gross Unrealized Losses - Less than 12 Months	(33,435)
Carrying Value - Less than 12 Months	$ 346,340
Number of Securities - Less than 12 Months | security	199
Weighted Average Coupon	4.80%
Weighted Average Yield	4.90%
Weighted Average Life (Years)	8 years 6 months
12 or More Months
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 3,107
Before Impairment - Amortized Cost Basis	3,157
Credit Impairment - Amortized Cost Basis	0
After Credit Impairment - Amortized Cost Basis	3,157
Gross Unrealized Losses - 12 or More Months	(249)
Carrying Value - 12 or More Months	$ 2,908
Number of Securities - 12 or More Months | security	2
Weighted Average Coupon	1.50%
Weighted Average Yield	4.00%
Weighted Average Life (Years)	3 years 7 months 6 days
Total/Weighted Average
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 411,298
Before Impairment - Amortized Cost Basis	393,748
Credit Impairment - Amortized Cost Basis	(10,816)
After Credit Impairment - Amortized Cost Basis	382,932
Gross Unrealized Losses - Total	(33,684)
Carrying Value - Total	$ 349,248
Number of Securities - Total | security	201
Weighted Average Coupon	4.80%
Weighted Average Yield	4.90%
Weighted Average Life (Years)	8 years 6 months