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v3.20.2

Principles of Consolidation - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) entity | Sep. 30, 2019 USD ($) | Dec. 31, 2018 partnership | Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items] |  |  |  |  |
Consolidation of multifamily loans held in securitization trusts |  | $ (3,849,779) | $ 1,481,554 |  |
Consolidation of multifamily ABS |  | $ (3,706,789) | $ 1,408,002 |  |
Deconsolidation, realized market valuation gain (loss) | $ (72,000) |  |  |  |
Number of partnerships consolidated | partnership |  |  |  | 2 |
VIE, ownership interest rate |  | 80.00% |  |  |
MSRs |  | $ 242,059 |  |  | $ 151,582
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of securitization entities to which asset transferred (in entities) | entity |  | 51 |  |  |
Legacy Sequoia | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Estimated fair value of investments |  | $ 5,000 |  |  |
Sequoia Choice | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Estimated fair value of investments |  | 211,000 |  |  |
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Estimated fair value of investments |  | 418,000 |  |  |
ABS issued, net, Amortized cost |  | 210,000 |  |  |
Freddie Mac K-Series | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Estimated fair value of investments |  | 27,000 |  |  |
CoreVest | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Estimated fair value of investments |  | 232,000 |  |  |
Servicing Investment | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
MSRs |  | $ 65,000 |  |  |

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