RESIDENTIAL MORTGAGE LOANS - Residential Mortgage Loans Outstanding by Loan Type, Excluding REO (Details) $ in Thousands	6 Months Ended
Jun. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Weighted Average Life (Years)	10 months 24 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	$ 662,210
Carrying Value	$ 617,951	$ 674,179
Loan Count \| loan	11,246
Weighted Average Yield	5.90%
Weighted Average Life (Years)	5 years 2 months 12 days
Acquired Residential Mortgage Loans Held-for-Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 368,192
Carrying Value	$ 343,998	509,887
Loan Count \| loan	4,532
Weighted Average Yield	5.10%
Weighted Average Life (Years)	3 years 7 months 6 days
Acquired Reverse Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 12,456
Carrying Value	$ 5,948	5,884
Loan Count \| loan	28
Weighted Average Yield	7.70%
Weighted Average Life (Years)	3 years 8 months 12 days
Interest in reverse mortgage loans	70.00%
Unpaid principal balance	$ 600
Percentage of loans that have reached a termination event	52.00%
Acquired Reverse Mortgage Loans \| Mr. Cooper
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest in reverse mortgage loans	30.00%
Acquired Performing Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 134,349
Carrying Value	$ 132,453	129,345
Loan Count \| loan	3,105
Weighted Average Yield	4.90%
Weighted Average Life (Years)	4 years 3 months 18 days
Acquired Performing Loans \| Ginnie Mae
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance	$ 722,400
Acquired Non-Performing Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	221,387
Carrying Value	$ 205,597	374,658
Loan Count \| loan	1,399
Weighted Average Yield	5.10%
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	$ 200,200
Acquired Performing Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	1,712,038
Carrying Value	$ 1,742,686	1,423,159
Loan Count \| loan	10,875
Weighted Average Yield	3.30%
Weighted Average Life (Years)	7 years 7 months 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	$ 416,534
Carrying Value	$ 402,571	335,544
Loan Count \| loan	2,284
Weighted Average Yield	4.80%
Weighted Average Life (Years)	3 years 1 month 6 days
Originated loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 4,448,668
Carrying Value	$ 4,599,186	2,947,113
Loan Count \| loan	17,338
Weighted Average Yield	3.20%
Weighted Average Life (Years)	27 years 8 months 12 days
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	$ 6,577,240
Carrying Value	$ 6,744,443	4,705,816
Loan Count \| loan	30,497
Weighted Average Yield	3.30%
Weighted Average Life (Years)	20 years 10 months 24 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	$ 6,945,432
Carrying Value	$ 7,088,441	$ 5,215,703

Interest in reverse mortgage loans

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Mortgage Loans on Real Estate, Unpaid Balance

+ References

No definition available.

+ Details

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- Definition

The percentage of loans in portfolio that have reached a termination event and can no longer be drawn upon.

+ References

No definition available.

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- Definition

The unpaid principal balance of underlying loans.

+ References

No definition available.

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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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The weighted average of the yield.

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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 http://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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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 http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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