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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Classification and Carrying Value of Unconsolidated VIEs (Details) - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Total Unconsolidated Variable Interest Entities |  |
Variable Interest Entity [Line Items] |  |
Investments | $ 230,216 | $ 278,936
ABS |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 856
Non-Agency RMBS |  |
Variable Interest Entity [Line Items] |  |
Investments | 24,462 | 29,290
Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 200,034 | 239,780
Joint venture equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 5,720 | 9,010
Multi-family loans | Total Unconsolidated Variable Interest Entities |  |
Variable Interest Entity [Line Items] |  |
Investments | 95,792 | 87,534
Multi-family loans | ABS |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 0
Multi-family loans | Non-Agency RMBS |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Multi-family loans | Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 95,792 | 87,534
Multi-family loans | Joint venture equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Investment securities available for sale, at fair value | Total Unconsolidated Variable Interest Entities |  |
Variable Interest Entity [Line Items] |  |
Investments | 24,462 | 30,146
Investment securities available for sale, at fair value | ABS |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 856
Investment securities available for sale, at fair value | Non-Agency RMBS |  |
Variable Interest Entity [Line Items] |  |
Investments | 24,462 | 29,290
Investment securities available for sale, at fair value | Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Investment securities available for sale, at fair value | Joint venture equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Equity investments | Total Unconsolidated Variable Interest Entities |  |
Variable Interest Entity [Line Items] |  |
Investments | 109,962 | 152,246
Equity investments | ABS |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 0
Equity investments | Non-Agency RMBS |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Equity investments | Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 104,242 | 152,246
Equity investments | Joint venture equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | $ 5,720 | 0
Assets of disposal group held for sale | Total Unconsolidated Variable Interest Entities |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 9,010
Assets of disposal group held for sale | ABS |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 0
Assets of disposal group held for sale | Non-Agency RMBS |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 0
Assets of disposal group held for sale | Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 0
Assets of disposal group held for sale | Joint venture equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments |  | $ 9,010

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