RESIDENTIAL MORTGAGE LOANS - Carrying Value of Mortgage Loans (Details) $ in Thousands	9 Months Ended
Sep. 30, 2023 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	$ 3,398,298
Balance, ending	2,819,282
Residential Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	3,850,817
Originations	28,097,716
Sales	(28,802,541)
Purchases/additional fundings	242,330
Proceeds from repayments	(194,163)
Transfer of loans to other assets	7,248
Transfer of loans to real estate owned	(10,761)
Transfers of loans to held-for-sale	(30,556)
Transfer of loans from held-for-investment	30,556
Valuation (provision) reversal on loans	(3,939)
Changes in instrument-specific credit risk	13,309
Other factors	(9,777)
Balance, ending	3,190,239
Loans Held-for-Investment, at Fair Value \| Residential Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	452,519
Originations	0
Sales	0
Purchases/additional fundings	1,269
Proceeds from repayments	(38,988)
Transfer of loans to other assets	0
Transfer of loans to real estate owned	(6,127)
Transfers of loans to held-for-sale	(30,556)
Transfer of loans from held-for-investment	0
Valuation (provision) reversal on loans	0
Changes in instrument-specific credit risk	4,000
Other factors	(11,160)
Balance, ending	370,957
Residential Mortgage Loans, Held-for-Sale \| Residential Portfolio Segment \| Loans held-for-sale, at lower of cost or fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	101,027
Originations	0
Sales	(6,946)
Purchases/additional fundings	0
Proceeds from repayments	(8,289)
Transfer of loans to other assets	0
Transfer of loans to real estate owned	(3,170)
Transfers of loans to held-for-sale	0
Transfer of loans from held-for-investment	0
Valuation (provision) reversal on loans	(3,939)
Changes in instrument-specific credit risk	0
Other factors	0
Balance, ending	78,683
Residential Mortgage Loans, Held-for-Sale \| Residential Portfolio Segment \| Loans Held-for-Sale, at Fair Value
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	3,297,271
Originations	28,097,716
Sales	(28,795,595)
Purchases/additional fundings	241,061
Proceeds from repayments	(146,886)
Transfer of loans to other assets	7,248
Transfer of loans to real estate owned	(1,464)
Transfers of loans to held-for-sale	0
Transfer of loans from held-for-investment	30,556
Valuation (provision) reversal on loans	0
Changes in instrument-specific credit risk	9,309
Other factors	1,383
Balance, ending	$ 2,740,599

Investment In Mortgage Loans On Real Estate, Originations

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Mortgage Loans on Real Estate, Fair Value Adjustment, Credit Risk Evaluation

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Mortgage Loans On Real Estate, Transfer Of Loans To Other Assets

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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Footnote 6
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
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-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
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-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

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-SubTopic 310
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-Subparagraph (SX 210.12-29(Column G))
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Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from sale.

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Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of expense related to estimated loss from loan and lease transactions.

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-SubTopic 10
-Topic 230
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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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