RESIDENTIAL MORTGAGE LOANS - Carrying Value of Mortgage Loans (Details) $ in Thousands	6 Months Ended
Jun. 30, 2022 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	$ 11,347,845
Transfer of loans to REO	4,890
Transfer of loans from held-for-investment	1,582
Balance, ending	5,410,989
Residential Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	11,917,777
Originations	45,730,604
Sales	(54,741,695)
Purchases/additional fundings	3,515,384
Proceeds from repayments	(334,718)
Transfer of loans to other assets	(27,083)
Transfer of loans to REO	(852)
Transfers of loans to held for sale	(1,582)
Valuation (provision) reversal on loans	(5,287)
Changes in instrument-specific credit risk	(5,543)
Other factors	(126,854)
Balance, ending	5,921,733
Residential Mortgage 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	569,932
Originations	0
Sales	0
Purchases/additional fundings	7,182
Proceeds from repayments	(47,444)
Transfer of loans to other assets	0
Transfer of loans to REO	(1,658)
Transfers of loans to held for sale	(1,582)
Transfer of loans from held-for-investment	0
Valuation (provision) reversal on loans	0
Changes in instrument-specific credit risk	(1,646)
Other factors	(14,040)
Balance, ending	510,744
Residential Mortgage Loans, Held-for-Sale \| Loans Held-for-Sale, at Lower of Cost or 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	132,921
Originations	0
Sales	(720)
Purchases/additional fundings	0
Proceeds from repayments	(10,173)
Transfer of loans to other assets	0
Transfer of loans to REO	312
Transfers of loans to held for sale	0
Transfer of loans from held-for-investment	0
Valuation (provision) reversal on loans	(5,287)
Changes in instrument-specific credit risk	0
Other factors	0
Balance, ending	117,053
Residential Mortgage Loans, Held-for-Sale \| Loans Held-for-Sale, 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	11,214,924
Originations	45,730,604
Sales	(54,740,975)
Purchases/additional fundings	3,508,202
Proceeds from repayments	(277,101)
Transfer of loans to other assets	(27,083)
Transfer of loans to REO	494
Transfers of loans to held for sale	0
Transfer of loans from held-for-investment	1,582
Valuation (provision) reversal on loans	0
Changes in instrument-specific credit risk	(3,897)
Other factors	(112,814)
Balance, ending	$ 5,293,936

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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Mortgage Loans on Real Estate, Transfer to Loans Held-for-Sale

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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
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 6
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 310
-Section S99
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Amount of 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.

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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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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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