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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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