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Residential Whole Loans - Additional Credit Related Information (Details) - Residential whole loans - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]                
Gross write-offs $ 142 $ 1,036 $ 616 $ 672 $ 5,262 $ 379    
Non-QM loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
Total 5,122,926           $ 5,122,926 $ 4,291,086
Gross write-offs 38 0 0 0 0 0    
Business purpose loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
Total 2,642,818           2,642,818 3,396,181
Legacy RPL/NPL loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
Total 1,006,236           1,006,236 1,082,549
Gross write-offs 74 $ 14 $ 180 $ 52 $ 170 $ 22    
Carrying Value                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 42,447           42,447  
Prior 1,096,605           1,096,605  
Total 1,139,052           1,139,052  
Gross write-offs, 2025 - 2022             0  
Gross write-offs, 2021             31  
Gross write-offs, prior             1,764  
Gross write-offs             1,795  
Carrying Value | Debt-to-Value Ratio, Less Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 41,093           41,093  
Prior 1,040,779           1,040,779  
Total 1,081,872           1,081,872  
Carrying Value | Debt-to-Value Ratio, Greater Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 1,354           1,354  
Prior 55,826           55,826  
Total 57,180           57,180  
Carrying Value | Non-QM loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 36,728           36,728  
Prior 578,733           578,733  
Total 615,461           615,461 722,392
Gross write-offs, 2025 - 2022             0  
Gross write-offs, 2021             0  
Gross write-offs, prior             37  
Gross write-offs             37  
Carrying Value | Non-QM loans | Debt-to-Value Ratio, Less Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 35,374           35,374  
Prior 571,818           571,818  
Total 607,192           607,192  
Carrying Value | Non-QM loans | Debt-to-Value Ratio, Greater Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 1,354           1,354  
Prior 6,915           6,915  
Total 8,269           8,269  
Carrying Value | Business purpose loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 5,719           5,719  
Prior 93,355           93,355  
Total 99,074           99,074 130,633
Gross write-offs, 2025 - 2022             0  
Gross write-offs, 2021             31  
Gross write-offs, prior             1,459  
Gross write-offs             1,490  
Carrying Value | Business purpose loans | Debt-to-Value Ratio, Less Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 5,719           5,719  
Prior 91,206           91,206  
Total 96,925           96,925  
Carrying Value | Business purpose loans | Debt-to-Value Ratio, Greater Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 0           0  
Prior 2,149           2,149  
Total 2,149           2,149  
Carrying Value | Legacy RPL/NPL loans                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 0           0  
Prior 424,517           424,517  
Total 424,517           424,517 $ 457,654
Gross write-offs, 2025 - 2022             0  
Gross write-offs, 2021             0  
Gross write-offs, prior             268  
Gross write-offs             268  
Carrying Value | Legacy RPL/NPL loans | Debt-to-Value Ratio, Less Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 0           0  
Prior 377,755           377,755  
Total 377,755           377,755  
Carrying Value | Legacy RPL/NPL loans | Debt-to-Value Ratio, Greater Than 80 Percent                
Financing Receivable, Credit Quality Indicator [Line Items]                
2025 - 2022 0           0  
2021 0           0  
Prior 46,762           46,762  
Total $ 46,762           $ 46,762