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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