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Summary of Significant Accounting Policies - Schedule of Adjustments for Adoption of ASU 2019-05 (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Equity investments |  | $ 239,631 | $ 259,095 |  |
Other assets |  | 198,416 | 115,292 |  |
Total assets | [1] | 5,641,698 | 4,655,587 |  |
Accumulated deficit |  | (559,338) | (551,268) |  |
Total Stockholders' Equity |  | $ 2,341,031 | $ 2,301,202 |  |
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, 2021 and December 31, 2020, assets of consolidated VIEs totaled $2,924,678 and $2,150,984, respectively, and the liabilities of consolidated VIEs totaled $2,219,830 and $1,667,306, respectively. See Note 7 for further discussion.

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