RESIDENTIAL MORTGAGE LOANS - Residential Mortgage Loans Outstanding by Loan Type, Excluding REO (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 754,347	$ 1,022,131
Weighted Average Life (Years)	1 year 6 months
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	$ 708,746
Carrying Value	$ 656,752	674,179
Loan Count \| loan	11,806
Weighted Average Yield	6.00%
Weighted Average Life (Years)	5 years 6 months
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	$ 379,186
Carrying Value	$ 323,079	509,887
Loan Count \| loan	4,719
Weighted Average Yield	5.60%
Weighted Average Life (Years)	3 years 8 months 12 days
Acquired Reverse Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 12,228
Carrying Value	$ 5,675	5,884
Loan Count \| loan	28
Weighted Average Yield	7.60%
Weighted Average Life (Years)	4 years 3 months 18 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	$ 132,431
Carrying Value	$ 126,814	129,345
Loan Count \| loan	3,155
Weighted Average Yield	5.50%
Weighted Average Life (Years)	4 years 4 months 24 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	$ 553,900
Acquired Non-Performing Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	234,527
Carrying Value	$ 190,590	374,658
Loan Count \| loan	1,536
Weighted Average Yield	5.50%
Weighted Average Life (Years)	3 years 3 months 18 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	$ 289,900
Acquired Performing Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	1,706,522
Carrying Value	$ 1,728,490	1,423,159
Loan Count \| loan	8,569
Weighted Average Yield	3.70%
Weighted Average Life (Years)	10 years
Acquired non-performing loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 455,723
Carrying Value	$ 406,100	335,544
Loan Count \| loan	2,325
Weighted Average Yield	5.20%
Weighted Average Life (Years)	3 years
Originated loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Outstanding Face Amount	$ 3,420,363
Carrying Value	$ 3,465,886	2,947,113
Loan Count \| loan	12,919
Weighted Average Yield	2.90%
Weighted Average Life (Years)	27 years 6 months
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	$ 5,582,608
Carrying Value	$ 5,600,476	4,705,816
Loan Count \| loan	23,813
Weighted Average Yield	3.30%
Weighted Average Life (Years)	20 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	$ 5,961,794
Carrying Value	$ 5,923,555	$ 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.

+ Details

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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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The weighted average of the yield.

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

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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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