MORTGAGE SERVICING RIGHTS AND MSR FINANCING RECEIVABLES - Schedule of Carrying Value of Investments in MSRs and MSR Financing Receivables (Details) $ in Thousands	6 Months Ended
Jun. 30, 2021 USD ($)
Activity related to carrying value of investments in mortgage servicing rights [Roll Forward]
Beginning balance	$ 4,585,841
Purchases, net	7,178
Transfers	0
Originations	463,136
Proceeds from sales	(36,895)
Amortization of servicing rights	(640,069)
Change in valuation inputs and assumptions	427,587
(Gain) loss realized	(16,349)
Ending balance	4,790,429
MSRs
Activity related to carrying value of investments in mortgage servicing rights [Roll Forward]
Beginning balance	3,489,675
Purchases, net	7,178
Transfers	47,831
Originations	463,136
Proceeds from sales	(33,691)
Amortization of servicing rights	(599,439)
Change in valuation inputs and assumptions	440,554
(Gain) loss realized	(14,651)
Ending balance	3,800,593
Mortgage Servicing Rights Financing Receivable
Activity related to carrying value of investments in mortgage servicing rights [Roll Forward]
Beginning balance	1,096,166
Purchases, net	0
Transfers	(47,831)
Originations	0
Proceeds from sales	(3,204)
Amortization of servicing rights	(40,630)
Change in valuation inputs and assumptions	(12,967)
(Gain) loss realized	(1,698)
Ending balance	$ 989,836

Amortization Of Mortgage Servicing Rights (MSRs), Excluding Excess Spread Financing

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- Definition

Gain (Loss) On Sale Of Mortgage Servicing Rights Financing Receivables

+ References

No definition available.

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- Definition

Mortgage Servicing Rights

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- Definition

Servicing Assets At Fair Value, Originations

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Servicing Assets At Fair Value, Transfers

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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- Definition

Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(i)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746

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- Definition

Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746

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