RESIDENTIAL MORTGAGE LOANS - Residential Mortgage Loans Outstanding by Loan Type, Excluding REO (Details) $ in Thousands	3 Months Ended
Mar. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Weighted Average Life (Years)	1 year 1 month 6 days
Residential mortgage loans held-for-investment, at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 498,602
Carrying Value	$ 426,259	$ 452,519
Loan Count \| loan	9,278
Weighted Average Yield	9.10%
Weighted Average Life (Years)	4 years 4 months 24 days
Total residential mortgage loans, held-for-sale, at lower of cost or market
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 113,108
Carrying Value	$ 97,511	101,027
Loan Count \| loan	2,607
Weighted Average Yield	8.70%
Weighted Average Life (Years)	4 years 6 months
Acquired performing loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 81,396
Carrying Value	$ 70,897	72,425
Loan Count \| loan	2,204
Weighted Average Yield	8.50%
Weighted Average Life (Years)	5 years
Acquired performing loans \| Ginnie Mae
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance	$ 433,200
Acquired non-performing loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	31,712
Carrying Value	$ 26,614	28,602
Loan Count \| loan	403
Weighted Average Yield	9.10%
Weighted Average Life (Years)	3 years 2 months 12 days
Acquired non-performing loans \| Ginnie Mae
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance	$ 240,300
Total residential mortgage loans, held-for-sale, at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	2,803,432
Carrying Value	$ 2,743,809	3,297,271
Loan Count \| loan	10,944
Weighted Average Yield	5.90%
Weighted Average Life (Years)	24 years
Acquired performing loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 983,700
Carrying Value	$ 945,582	890,131
Loan Count \| loan	4,188
Weighted Average Yield	5.80%
Weighted Average Life (Years)	15 years 1 month 6 days
Acquired non-performing loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 263,732
Carrying Value	$ 244,752	340,342
Loan Count \| loan	1,403
Weighted Average Yield	4.60%
Weighted Average Life (Years)	26 years 10 months 24 days
Originated loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 1,556,000
Carrying Value	$ 1,553,475	2,066,798
Loan Count \| loan	5,353
Weighted Average Yield	6.10%
Weighted Average Life (Years)	29 years 2 months 12 days
Total residential mortgage loans, held-for-sale, at fair value/lower of cost or market
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 2,916,540
Carrying Value	$ 2,841,320	$ 3,398,298

Mortgage Loans on Real Estate, Carrying Amount of Mortgages, Including Interest

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- Definition

The unpaid principal balance of underlying loans.

+ References

No definition available.

+ Details

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- Definition

Weighted average expected timing of the receipt of expected cash flows for this investment.

+ References

No definition available.

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- Definition

The weighted average of the yield.

+ References

No definition available.

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- Definition

Amount of contractual principal due at origination of mortgage loan within 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.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column F))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of mortgage loans within 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 3))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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