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Summary of Significant Accounting Policies - Schedule of Adjustments for Adoption of ASU 2019-05 (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Residential loans, net |  | $ 3,049,166 | $ 2,961,396
Equity investments |  | 259,095 | 189,965
Other assets |  | 165,824 | 169,214
Total assets | [1] | 4,655,587 | 23,483,369
Accumulated deficit |  | (551,268) | (148,863)
Total Stockholders' Equity |  | $ 2,301,202 | 2,205,733
Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Multi-family loans |  |  | 2,420
Equity investments |  |  | 1,394
Other assets |  |  | 2,755
Total assets |  |  | 12,284
Accumulated deficit |  |  | 12,284
Total Stockholders' Equity |  |  | 12,284
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Multi-family loans |  |  | 182,465
Equity investments |  |  | 107,477
Other assets |  |  | 3,620
Total assets |  |  | 502,033
Accumulated deficit |  |  | (136,579)
Total Stockholders' Equity |  |  | (136,579)
Distressed And Other Residential Mortgage Loans | Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Residential loans, net |  |  | 5,715
Distressed And Other Residential Mortgage Loans | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Residential loans, net |  |  | 208,471
Previously Reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Multi-family loans |  |  | 180,045
Equity investments |  |  | 106,083
Other assets |  |  | 865
Total assets |  |  | 489,749
Accumulated deficit |  |  | (148,863)
Total Stockholders' Equity |  |  | (148,863)
Previously Reported | Distressed And Other Residential Mortgage Loans |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Residential loans, net |  |  | $ 202,756
[1] | Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities (“VIEs”) as the Company is the primary beneficiary of these VIEs. As of December 31, 2020 and December 31, 2019, assets of consolidated VIEs totaled $2,150,984 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,667,306 and $17,878,314, respectively. See Note 7 for further discussion.

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