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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Schedule of Mortgage Loans by Property Type and Geographic Distribution (Parenthetical) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
General allowance for credit loss liability on unfunded | $ 5,800 | $ 5,900
General CECL allowance on unfunded commitments | $ 5,782 | $ 5,948
Germany |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 8.30% | 8.40%
Italy |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 2.30% | 2.40%
Spain |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio |  | 3.50%
Sweden |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.20% | 3.10%
Netherlands |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 0.30% | 0.30%
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.20% | 1.30%
Northeast |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.40% | 0.60%
Southwest |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.10% | 1.50%
Mid-Atlantic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.40% | 1.40%
Residential-for-Sale |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 3.70% | 5.50%
Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 9.10% | 4.70%
Senior Housing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 10.50% | 4.70%
Student Housing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 5.30% | 4.60%
Vacation Rentals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.90% | 2.30%
Pubs |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 2.70% | 2.90%
Caravan Park |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio |  | 2.70%
Urban Predevelopment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage of Portfolio | 1.60% | 1.90%

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