INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Schedule of Loans Held-For-Sale, at Fair Value (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($)
Originated Loans
Loans Held-for-sale, Reconciliation [Roll Forward]
Beginning balance, loans held-for-sale	$ 0
Shellpoint acquisition	488,233
Originations	3,439,574
Sales	(3,269,689)
Proceeds from repayments	(6,348)
Change in fair value	3,490
Ending balance, loans held-for-sale	655,260
Acquired Loans
Loans Held-for-sale, Reconciliation [Roll Forward]
Beginning balance, loans held-for-sale	0
Purchases	2,088,638
Sales	0
Proceeds from repayments	(3,963)
Transfer of loans to real estate owned	(753)
Change in fair value	69,347
Ending balance, loans held-for-sale	$ 2,153,269

Investment in Mortgage Loans on Real Estate, Acquisitions

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Investment in Mortgage Loans on Real Estate, Originations

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Loans Held-for-sale, Reconciliation [Roll Forward]

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Mortgage Loans on Real Estate, Fair Value Adjustment

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Transfer Of Loans Held For Sale To Real Estate Owned

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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- Definition

The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 230
-Section 55
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109127227&loc=d3e60097-112785

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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The cash inflow from collection of repayments from borrowers on loans that are held with the intention to resell in the near future; includes mortgages and other types of loans.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 16
-Subparagraph (a)
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The cash inflow from securitizing loans held with the intention to resell in the near future.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3337-108585

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