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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
Sep. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Total assets [1] $ 6,769,469 $ 5,658,301
Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Maximum exposure 316,529 401,005
Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Maximum exposure 95,829 120,021
Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Maximum exposure 32,450 70,603
Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Maximum exposure 178,314 210,381
Assets of disposal group held for sale | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Maximum exposure 9,936  
ABS | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 1,111 39,679
ABS | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
ABS | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 1,111 39,679
ABS | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
ABS | Assets of disposal group held for sale | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0  
Non-Agency RMBS | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 31,339 30,924
Non-Agency RMBS | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
Non-Agency RMBS | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 31,339 30,924
Non-Agency RMBS | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
Non-Agency RMBS | Assets of disposal group held for sale | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0  
Preferred equity investments in multi-family properties | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 272,168 300,819
Preferred equity investments in multi-family properties | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 95,829 120,021
Preferred equity investments in multi-family properties | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
Preferred equity investments in multi-family properties | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 176,339 180,798
Preferred equity investments in multi-family properties | Assets of disposal group held for sale | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0  
Joint venture equity investments in multi-family properties | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 9,936 10,440
Joint venture equity investments in multi-family properties | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
Joint venture equity investments in multi-family properties | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
Joint venture equity investments in multi-family properties | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 10,440
Joint venture equity investments in multi-family properties | Assets of disposal group held for sale | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 9,936  
Equity investments in entities that invest in residential properties | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 1,975 19,143
Equity investments in entities that invest in residential properties | Multi-family loans | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
Equity investments in entities that invest in residential properties | Investment securities available for sale, at fair value | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 0 0
Equity investments in entities that invest in residential properties | Equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets 1,975 $ 19,143
Equity investments in entities that invest in residential properties | Assets of disposal group held for sale | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Variable Interest Entity [Line Items]    
Total assets $ 0  
[1] Our condensed 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 September 30, 2022 and December 31, 2021, assets of consolidated VIEs totaled $4,076,293 and $2,940,513, respectively, and the liabilities of consolidated VIEs totaled $3,282,435 and $2,235,665, respectively. See Note 7 for further discussion.