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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Classification and Carrying Value of Unconsolidated VIEs (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total assets | [1] | $ 5,641,698 | $ 4,655,587
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 861,402 | 1,376,514
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Total Unconsolidated Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 401,005 | 465,913
Equity Method Investment, Nonconsolidated Investee or Group of Investees | ABS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 39,679 | 43,225
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Non-Agency RMBS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 30,924 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Preferred equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 300,819 | 341,266
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Joint venture equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 10,440 | 5,092
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Equity investments in entities that invest in residential properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 19,143 | 76,330
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Multi-family loans | Total Unconsolidated Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 120,021 | 163,593
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Multi-family loans | ABS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Multi-family loans | Non-Agency RMBS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Multi-family loans | Preferred equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 120,021 | 158,501
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Multi-family loans | Joint venture equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 5,092
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Multi-family loans | Equity investments in entities that invest in residential properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Investment securities available for sale, at fair value | Total Unconsolidated Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 70,603 | 43,225
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Investment securities available for sale, at fair value | ABS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 39,679 | 43,225
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Investment securities available for sale, at fair value | Non-Agency RMBS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 30,924 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Investment securities available for sale, at fair value | Preferred equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Investment securities available for sale, at fair value | Joint venture equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Investment securities available for sale, at fair value | Equity investments in entities that invest in residential properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Equity investments | Total Unconsolidated Variable Interest Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 210,381 | 259,095
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Equity investments | ABS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 | 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Equity investments | Non-Agency RMBS |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 0 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Equity investments | Preferred equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 180,798 | 182,765
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Equity investments | Joint venture equity investments in multi-family properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  |  | 0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Equity investments | Equity investments in entities that invest in residential properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | 19,143 | $ 76,330
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Equity investments | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets |  | $ 10,440 |
[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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