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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  | $ 0 | $ 81,890
General CECL allowance increased |  |  |  | $ (5,800) | $ 2,100 | $ 4,400 |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Increase in current expected credit loss allowance, net | $ 127,512 | $ 7,500 | $ 142,000 | $ 0 | 141,480 | $ 0 |  |
Write-offs, specific CECL allowance, funded | 127,512 |  |  |  | 81,980 |  |  |
General CECL allowance increased | 900 | 2,800 | 5,700 |  |  |  |  |
Specific CECL allowance increased | 127,500 | $ 7,500 | $ 142,000 |  | $ 141,500 |  | $ 149,500 |
Specific CECL allowance writeoff | $ 127,500 |  |  |  |  |  |  |

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