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Residential Loans and Residential Loans Held for Sale, at Fair Value - Schedule of Residential Mortgage Loans Held in Securitization Trusts, Net (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | $ 4,454,599 | $ 4,129,335
Premium / (Discount) | (89,987) | (74,755)
Change in fair value | (107,929) | (212,842)
Carrying value | 4,256,683 | 3,841,738
Consolidated SLST | VIE, Primary Beneficiary |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | 1,329,199 | 1,111,633
Premium / (Discount) | (62,042) | (24,303)
Change in fair value | (84,558) | (121,658)
Carrying value | 1,182,599 | 965,672
Residential loans |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | 315,228 | 652,642
Premium / (Discount) | 270 | (1,750)
Change in fair value | (7,076) | (18,626)
Carrying value | 308,422 | 632,266
Residential loans held in securitization trusts |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | 2,707,733 | 2,365,060
Premium / (Discount) | (28,215) | (48,702)
Change in fair value | (18,892) | (72,558)
Carrying value | 2,660,626 | $ 2,243,800
Total Residential loans |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | 4,352,160 |
Premium / (Discount) | (89,987) |
Change in fair value | (110,526) |
Carrying value | 4,151,647 |
Residential loans held for sale |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | 102,439 |
Premium / (Discount) | 0 |
Change in fair value | 2,597 |
Carrying value | $ 105,036 |

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- Definition Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column F -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478322/948-310-S50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column F)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479628/948-310-S99-1 + Details
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