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Home Equity Investments (HEI) - Schedule of Activity of Home Equity Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair value of HEI purchased and originated | Unsecuritized HEI |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation (losses) gains recorded | $ 2,926 | $ 460 | $ 8,986 | $ 1,066
Fair value of HEI purchased and originated | Securitized HEI |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation (losses) gains recorded | 0 | 0 | 0 | 0
Fair value of HEI transferred/Net market valuation (losses) gains recorded | Unsecuritized HEI |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation (losses) gains recorded | 148,963 | 0 | 148,963 | 0
Fair value of HEI transferred/Net market valuation (losses) gains recorded | Securitized HEI |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation (losses) gains recorded | (148,963) | 0 | (148,963) | 0
Fair value of HEI sold to third party | Unsecuritized HEI |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation (losses) gains recorded | 262,447 | 0 | 262,447 | 0
Fair value of HEI sold to third party | Securitized HEI |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation (losses) gains recorded | 0 | 0 | 0 | 0
Net market valuation (losses) gains recorded | Unsecuritized HEI |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation (losses) gains recorded | 198 | 5,812 | (6,972) | 23,618
Net market valuation (losses) gains recorded | Securitized HEI |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net market valuation (losses) gains recorded | $ 2,960 | $ 19,408 | $ 23,493 | $ 51,861

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