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Summary of Significant Accounting Policies - Schedule of Adjustments for Adoption of ASU 2019-05 (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Equity investments |  | $ 179,746 | $ 239,631 |  |
Other assets |  | 259,356 | 215,019 |  |
Total assets | [1] | 6,240,745 | 5,658,301 |  |
Accumulated deficit |  | (1,052,768) | (559,338) |  |
Company's stockholders' equity |  | $ 1,767,216 | $ 2,341,031 |  |
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 |
Company's 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)
Company's 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) |
Company's 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, 2022 and December 31, 2021, assets of consolidated VIEs totaled $4,261,097 and $2,940,513, respectively, and the liabilities of consolidated VIEs totaled $3,403,257 and $2,235,665, respectively. See Note 7 for further discussion.

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