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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.