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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Maximum exposure |  |
Variable Interest Entity [Line Items] |  |
Investments | $ 218,238 | $ 230,216
Maximum exposure | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investments | 91,905 | 95,792
Maximum exposure | Investment securities available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Investments | 23,855 | 24,462
Maximum exposure | Equity investments |  |
Variable Interest Entity [Line Items] |  |
Investments | 102,478 | 109,962
Non-Agency RMBS |  |
Variable Interest Entity [Line Items] |  |
Investments | 23,855 | 24,462
Non-Agency RMBS | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Non-Agency RMBS | Investment securities available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Investments | 23,855 | 24,462
Non-Agency RMBS | Equity investments |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 192,713 | 200,034
Preferred equity investments in multi-family properties | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investments | 91,905 | 95,792
Preferred equity investments in multi-family properties | Investment securities available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Preferred equity investments in multi-family properties | Equity investments |  |
Variable Interest Entity [Line Items] |  |
Investments | 100,808 | 104,242
Joint venture equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 1,670 | 5,720
Joint venture equity investments in multi-family properties | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Joint venture equity investments in multi-family properties | Investment securities available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Joint venture equity investments in multi-family properties | Equity investments |  |
Variable Interest Entity [Line Items] |  |
Investments | $ 1,670 | $ 5,720

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