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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Reversal of specific CECL allowance |  |  |  | $ 127,512 |  |
Junior Mezzanine A Loan |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Specific CECL allowance increased |  |  |  |  |  | $ 142,000
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
General CECL allowance increased | $ 1,100 | $ 3,100 | $ 4,000 | 900 | $ 2,800 | 5,700
Specific CECL allowance increased | 6,200 |  |  | 127,500 | 7,500 |
Aggregate specific CECL allowance |  |  |  |  |  | 268,000
Reversal of specific CECL allowance | (1,300) | $ 0 | $ 0 |  | $ 7,500 | $ 142,000
Specific Allowance For Credit Loss Writeoff | $ 6,200 |  |  | $ 127,500 |  |

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