RESIDENTIAL MORTGAGE LOANS - Carrying Value of Mortgage Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Accretion of loan discount and other amortization	$ 151,540	$ 379,129	$ 701,967
Transfer of loans to real estate owned	(43,409)	(86,167)
PCD Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	66,278	144,065
Purchases/additional fundings		0
Sales		0
Proceeds from repayments		(16,855)
Accretion of loan discount and other amortization		16,041
(Allowance) reversal for loan losses		(2,332)
Transfer of loans to real estate owned		(14,487)
Transfers of loans to held for sale		60,154
Balance, ending		66,278	144,065
Residential Portfolio Segment
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Ditech Acquisition		999,336
Purchases/additional fundings	3,433,110	8,632,949
Proceeds from repayments	(423,335)	(539,915)
Accretion of loan discount and other amortization		28,702
Transfer of loans to other assets	(25,704)	(10,566)
Transfer of loans to real estate owned	(35,470)	(74,324)
Transfers of loans to held for sale	(62,274)	(80,659)
Residential Portfolio Segment \| Performing Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance, beginning	$ 859,428	591,253
Ditech Acquisition		381,039
Purchases/additional fundings		0
Proceeds from repayments		(102,340)
Accretion of loan discount and other amortization		12,661
Provision for loan losses		(595)
Transfer of loans to other assets		0
Transfer of loans to real estate owned		(6,223)
Transfers of loans to held for sale		20,505
Fair value adjustment		4,138
Balance, ending		$ 859,428	$ 591,253

Mortgage Loans on Real Estate, Fair Value Adjustment

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Mortgage Loans on Real Estate, Sales

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No definition available.

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Mortgage Loans on Real Estate, Transfer of Loans to Other Assets

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No definition available.

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

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No definition available.

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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Acquisitions

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No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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-SubTopic 10
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The increase (decrease) during the reporting period in the value of loans or securitized loans that are held with the intention to sell in the near future.

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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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-Publisher FASB
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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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-Publisher FASB
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- Definition

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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No definition available.

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- Definition

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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