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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Schedule of Classification and Carrying Value of Unconsolidated VIEs (Details) - Equity Method Investment, Nonconsolidated Investee or Group of Investees - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Maximum exposure |  |
Variable Interest Entity [Line Items] |  |
Investments | $ 121,985 | $ 185,858
Maximum exposure | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investments | 68,647 | 86,192
Maximum exposure | Investment securities available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Investments | 22,513 | 22,892
Maximum exposure | Equity investments |  |
Variable Interest Entity [Line Items] |  |
Investments | 28,825 | 74,774
Maximum exposure | Other assets |  |
Variable Interest Entity [Line Items] |  |
Investments | 2,000 | 2,000
Non-Agency RMBS |  |
Variable Interest Entity [Line Items] |  |
Investments | 22,513 | 22,892
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 | 22,513 | 22,892
Non-Agency RMBS | Equity investments |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Non-Agency RMBS | Other assets |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Preferred equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments | 97,472 | 159,628
Preferred equity investments in multi-family properties | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investments | 68,647 | 86,192
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 | 28,825 | 73,436
Preferred equity investments in multi-family properties | Other assets |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Joint venture equity investments in multi-family properties |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 1,338
Joint venture equity investments in multi-family properties | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 0
Joint venture equity investments in multi-family properties | Investment securities available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 0
Joint venture equity investments in multi-family properties | Equity investments |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 1,338
Joint venture equity investments in multi-family properties | Other assets |  |
Variable Interest Entity [Line Items] |  |
Investments |  | 0
Other investments |  |
Variable Interest Entity [Line Items] |  |
Investments | 2,000 | 2,000
Other investments | Multi-family loans |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Other investments | Investment securities available for sale, at fair value |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Other investments | Equity investments |  |
Variable Interest Entity [Line Items] |  |
Investments | 0 | 0
Other investments | Other assets |  |
Variable Interest Entity [Line Items] |  |
Investments | $ 2,000 | $ 2,000

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