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Residential Whole Loans - Additional Credit Related Information (Details) - Residential whole loans - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Business purpose loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 3,139,060 $ 3,396,181
Non-QM loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 4,540,553 4,291,086
Legacy RPL/NPL loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,061,802 1,082,549
Carrying Value    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 44,343  
Prior 1,218,142  
Total 1,262,485  
Gross write-offs, 2025 - 2022 0  
Gross write-offs, 2021 0  
Gross write-offs, prior 615  
Gross write-offs 615  
Carrying Value | Debt-to-Value Ratio, Less Than 80 Percent    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 42,334  
Prior 1,155,575  
Total 1,197,910  
Carrying Value | Debt-to-Value Ratio, Greater Than 80 Percent    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 2,009  
Prior 62,566  
Total 64,575  
Carrying Value | Business purpose loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 6,670  
Prior 113,046  
Total 119,716 130,633
Gross write-offs, 2025 - 2022 0  
Gross write-offs, 2021 0  
Gross write-offs, prior 436  
Gross write-offs 436  
Carrying Value | Business purpose loans | Debt-to-Value Ratio, Less Than 80 Percent    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 6,572  
Prior 108,303  
Total 114,875  
Carrying Value | Business purpose loans | Debt-to-Value Ratio, Greater Than 80 Percent    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 98  
Prior 4,743  
Total 4,841  
Carrying Value | Non-QM loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 37,673  
Prior 657,850  
Total 695,523 722,392
Gross write-offs, 2025 - 2022 0  
Gross write-offs, 2021 0  
Gross write-offs, prior 0  
Gross write-offs 0  
Carrying Value | Non-QM loans | Debt-to-Value Ratio, Less Than 80 Percent    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 35,762  
Prior 649,632  
Total 685,394  
Carrying Value | Non-QM loans | Debt-to-Value Ratio, Greater Than 80 Percent    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 1,911  
Prior 8,218  
Total 10,129  
Carrying Value | Legacy RPL/NPL loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 0  
Prior 447,246  
Total 447,246 $ 457,654
Gross write-offs, 2025 - 2022 0  
Gross write-offs, 2021 0  
Gross write-offs, prior 179  
Gross write-offs 179  
Carrying Value | Legacy RPL/NPL loans | Debt-to-Value Ratio, Less Than 80 Percent    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 0  
Prior 397,641  
Total 397,641  
Carrying Value | Legacy RPL/NPL loans | Debt-to-Value Ratio, Greater Than 80 Percent    
Financing Receivable, Credit Quality Indicator [Line Items]    
2025 - 2022 0  
2021 0  
Prior 49,605  
Total $ 49,605