REAL ESTATE AND OTHER SECURITIES - Real Estate and Other Securities for Held to Maturity securities (Details)	9 Months Ended
	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Outstanding Face Amount	$ 25,859,938,000
Weighted Average Life (Years)	1 year
Residential Mortgage Backed Securities, Held To Maturity, Treasury
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Outstanding Face Amount	$ 1,000,000,000
Amortized Cost / Carrying Value	992,122,000	$ 0
Fair Value	992,183,000
Unrecognized Gains/(Losses)	$ 61,000
Number of Securities | security	1
Weighted Average Yield	5.40%
Weighted Average Life (Years)	2 months 12 days