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Residential Whole Loans - Interest Income Components (Details) - Residential whole loans, total or weighted average - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income $ 157,665 $ 119,510
Purchased Credit Deteriorated Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 6,355 7,138
Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 137,820 97,576
Performing | Non-QM loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 55,861 44,089
Performing | Transitional loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 53,216 28,227
Performing | Single-family Rental Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 27,102 21,313
Performing | Seasoned performing loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 1,124 1,090
Performing | Agency eligible investor loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 517 2,857
Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 13,490 14,796
Held at Carrying Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 21,701 24,499
Held at Carrying Value | Purchased Credit Deteriorated Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 6,355 7,138
Held at Carrying Value | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 15,346 17,361
Held at Carrying Value | Performing | Non-QM loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 11,420 12,674
Held at Carrying Value | Performing | Transitional loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 241 620
Held at Carrying Value | Performing | Single-family Rental Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 2,561 2,977
Held at Carrying Value | Performing | Seasoned performing loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 1,124 1,090
Held at Carrying Value | Performing | Agency eligible investor loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 0 0
Held at Carrying Value | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 0 0
Held at Fair Value    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 135,964 95,011
Held at Fair Value | Purchased Credit Deteriorated Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 0 0
Held at Fair Value | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 122,474 80,215
Held at Fair Value | Performing | Non-QM loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 44,441 31,415
Held at Fair Value | Performing | Transitional loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 52,975 27,607
Held at Fair Value | Performing | Single-family Rental Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 24,541 18,336
Held at Fair Value | Performing | Seasoned performing loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 0 0
Held at Fair Value | Performing | Agency eligible investor loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income 517 2,857
Held at Fair Value | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest income $ 13,490 $ 14,796