REAL ESTATE AND OTHER SECURITIES - Summary of Real Estate Securities (Details) $ in Thousands	3 Months Ended
Mar. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 25,589,381
Carrying Value	$ 8,987,572	$ 8,289,277
Weighted Average Life (Years)	1 year 1 month 6 days
Investments	$ 24,397,294
Residual Bonds
Debt Securities, Available-for-sale [Line Items]
Investments	18,600
Non-Agency Bonds
Debt Securities, Available-for-sale [Line Items]
Investments	1,200
AFS Agency
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	78,918
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Carrying Value	$ 73,181	73,439
Number of Securities \| security	1
Weighted Average Coupon	3.50%
Weighted Average Yield	3.50%
Weighted Average Life (Years)	11 years
AFS Non-Agency
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 2,598,801
Gross Unrealized Gains	71,727
Gross Unrealized Losses	(30,071)
Carrying Value	$ 390,848	397,076
Number of Securities \| security	334
Weighted Average Coupon	3.50%
Weighted Average Yield	3.70%
Weighted Average Life (Years)	4 years 9 months 18 days
Weighted Average Principal Subordination	29.40%
FVO Agency
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 7,962,225
Gross Unrealized Gains	165,874
Gross Unrealized Losses	(2,709)
Carrying Value	$ 7,968,337	7,264,978
Number of Securities \| security	38
Weighted Average Coupon	5.10%
Weighted Average Yield	5.10%
Weighted Average Life (Years)	8 years
FVO Non-Agency
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 14,949,437
Gross Unrealized Gains	65,182
Gross Unrealized Losses	(87,119)
Carrying Value	$ 555,206	553,784
Number of Securities \| security	344
Weighted Average Coupon	2.70%
Weighted Average Yield	8.70%
Weighted Average Life (Years)	6 years 1 month 6 days
Weighted Average Principal Subordination	16.60%
Agency And Non-Agency Residential Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 25,589,381
Gross Unrealized Gains	302,783
Gross Unrealized Losses	(119,899)
Carrying Value	$ 8,987,572	$ 8,289,277
Number of Securities \| security	717
Weighted Average Coupon	4.90%
Weighted Average Yield	5.30%
Weighted Average Life (Years)	7 years 9 months 18 days
Agency
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 8,041,143
Agency \| Fixed Rate Securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	8,000,000
Non-Agency
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	17,548,238
Non-Agency \| Fixed Rate Securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	8,200,000
Residual and interest - only notional amount	7,300,000
Non-Agency \| Floating Rate Securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	9,300,000
Residual and interest - only notional amount	9,100,000
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	514
Gross Unrealized Gains	2
Gross Unrealized Losses	0
Carrying Value	$ 479
Number of Securities \| security	2
Weighted Average Coupon	8.20%
Weighted Average Yield	9.50%
Weighted Average Life (Years)	2 years 2 months 12 days
Consumer loans
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 400
Gross Unrealized Gains	553
Gross Unrealized Losses	0
Carrying Value	$ 577
Number of Securities \| security	3
Weighted Average Life (Years)	8 months 12 days
Interest-only securities
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 9,417,388
Gross Unrealized Gains	33,121
Gross Unrealized Losses	(30,151)
Carrying Value	$ 157,605
Number of Securities \| security	143
Weighted Average Coupon	0.90%
Weighted Average Yield	14.20%
Weighted Average Life (Years)	2 years 8 months 12 days
Servicing strips
Debt Securities, Available-for-sale [Line Items]
Outstanding Face Amount	$ 4,264,723
Gross Unrealized Gains	22,010
Gross Unrealized Losses	(4,262)
Carrying Value	$ 61,056
Number of Securities \| security	61
Weighted Average Coupon	0.60%
Weighted Average Yield	27.10%
Weighted Average Life (Years)	3 years 4 months 24 days

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