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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Current Expected Credit Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Allowance reserve | $ 39,257 | $ 30,836
Unfunded commitments | 5,782 | 5,948
Total General CECL Allowance | 45,039 | 36,784
Commercial Mortgage Portfolio Segment |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Allowance reserve | 39,142 | 30,167
Subordinate Mortgage Portfolio Segment |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Allowance reserve | $ 115 | $ 669

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