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Residential Whole Loans - Residential Whole Loans, at Carrying and Fair Value (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 1,606,204  
Allowance for Credit Losses (28,557) $ (35,314)
Total Residential Whole Loans $ 8,424,216 $ 7,518,739
Number of loans | loan 25,132 23,843
Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for Credit Losses $ (28,557) $ (35,314)
Total Residential Whole Loans $ 1,577,646 $ 1,791,215
Number of loans | loan 6,493 7,126
Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for Credit Losses $ 0 $ 0
Total Residential Whole Loans $ 6,846,570 $ 5,727,524
Number of loans | loan 18,639 16,717
Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 7,314,050 $ 6,287,650
Performing | Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,167,290 1,356,235
Performing | Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 6,146,760 4,931,415
Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 699,810 796,109
Nonperforming | Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 0 0
Nonperforming | Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 699,810 796,109
Non-QM loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 873,791  
Non-QM loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,574,263 3,359,830
Non-QM loans | Performing | Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 873,790 987,282
Non-QM loans | Performing | Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 2,700,473 2,372,548
Transitional loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 2,097,601 1,417,220
Transitional loans | Performing | Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 37,946 75,188
Transitional loans | Performing | Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 2,059,655 1,342,032
Single-family rental loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 182,879  
Single-family rental loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,516,363 1,376,574
Single-family rental loans | Performing | Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 182,879 210,833
Single-family rental loans | Performing | Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,333,484 1,165,741
Seasoned performing loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 72,675  
Seasoned performing loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 72,675 82,932
Seasoned performing loans | Performing | Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 72,675 82,932
Seasoned performing loans | Performing | Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 0 0
Agency eligible investor loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 53,148 51,094
Agency eligible investor loans | Performing | Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 0 0
Agency eligible investor loans | Performing | Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 53,148 51,094
Purchased Credit Deteriorated Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 438,913 470,294
Purchased Credit Deteriorated Loans | Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 438,913 470,294
Purchased Credit Deteriorated Loans | Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 0 0
Single Family Residential Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,100,000 784,900
Multi-Family Transitional Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,000,000 632,300
New Construction Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans $ 415,900 $ 283,100