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Real Estate Securities - Schedule of Carrying Value of AFS Securities by Type (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Amortized cost | $ 259,915 |  | $ 191,438 |  |  |
Gross unrealized gains | 29,104 |  | 26,631 |  |  |
Gross unrealized losses | (3,852) |  | (5,674) |  |  |
Allowance for credit losses | (795) | $ (839) | (921) | $ (867) | $ (1,339) | $ (2,482)
AFS | 284,372 |  | 211,474 |  |  |
Senior |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Amortized cost | 0 |  | 39,135 |  |  |
Gross unrealized gains | 0 |  | 230 |  |  |
Gross unrealized losses | 0 |  | 0 |  |  |
Allowance for credit losses | 0 |  | 0 |  |  |
AFS | 0 |  | 39,365 |  |  |
Mezzanine |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Amortized cost | 0 |  | 31,250 |  |  |
Gross unrealized gains | 0 |  | 668 |  |  |
Gross unrealized losses | 0 |  | (51) |  |  |
Allowance for credit losses | 0 |  | 0 |  |  |
AFS | 0 |  | 31,867 |  |  |
Subordinate |  |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |  |
Amortized cost | 259,915 |  | 121,053 |  |  |
Gross unrealized gains | 29,104 |  | 25,733 |  |  |
Gross unrealized losses | (3,852) |  | (5,623) |  |  |
Allowance for credit losses | (795) |  | (921) |  |  |
AFS | $ 284,372 |  | $ 140,242 |  |  |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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