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Borrowings - Schedule of Assets Held as Collateral Related to Secured Borrowings (Footnote) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
MSRs, at fair value	$ 1,069,013	$ 1,044,914	$ 1,486,395	$ 1,455,553	$ 1,312,633	$ 1,457,149
Certain Cohorts | Other Liabilities
Debt Instrument [Line Items]
MSRs, at fair value		(500)
Certain Cohorts | Other Liabilities | Residential Mortgage Backed Securities
Debt Instrument [Line Items]
MSRs, at fair value		(17,400)
Certain Cohorts | Other Liabilities | EBO And PLS Mortgage Servicing Rights
Debt Instrument [Line Items]
MSRs, at fair value		$ 17,900

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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
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Fair value of a liability representing servicing arrangements under which the estimated future revenue from contractually specified servicing fees, late charges, and other ancillary revenues are not expected to adequately compensate the servicer.

+ References

Reference 1: 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 2: 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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-Name Accounting Standards Codification
-Topic 860
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-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746

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