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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |  |
Beginning balance, Specific CECL Allowance |  |  | $ 30,836 |  |  |  | $ 30,836 |  |
Allowances (Reversals), net |  |  |  | $ 127,512 |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  | (6,200) | $ (127,512) |
Ending balance, Specific CECL Allowance | $ 39,257 |  |  | 342,500 |  |  | 39,257 | 30,836 |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance, General CECL Allowance, Funded | 38,848 | $ 34,712 | 30,836 | 35,319 | $ 32,558 | $ 26,482 | 30,836 | 26,482 |
Allowances (Reversals), net | 409 | 4,136 | 3,876 | (1,127) | 2,761 | 6,076 |  |  |
Quarter writeoff, General CECL allowance, funded | 0 |  |  | 0 |  |  |  |  |
Ending balance, General CECL Allowance, Funded | 39,257 | 38,848 | 34,712 | 34,192 | 35,319 | 32,558 | 39,257 | 30,836 |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance, General CECL Allowance, Unfunded | 5,057 | 6,080 | 5,948 | 3,622 | 3,625 | 4,017 | 5,948 | 4,017 |
Allowances (Reversals), net | 725 | (1,023) | 132 | 228 | (3) | (392) |  |  |
Quarter writeoff, General CECL allowance, unfunded | 0 |  |  | 0 |  |  |  |  |
Ending balance, General CECL Allowance, Unfunded | 5,782 | 5,057 | 6,080 | 3,850 | 3,622 | 3,625 | 5,782 | 5,948 |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance, General CECL Allowance | 43,905 | 40,792 | 36,784 | 38,941 | 36,183 | 30,499 | 36,784 | 30,499 |
Allowances (Reversals), net | 1,134 | 3,113 | 4,008 | (899) | 2,758 | 5,684 |  |  |
General CECL Allowance writeoff | 0 |  |  | 0 |  |  |  |  |
Ending balance,General CECL Allowance | 45,039 | 43,905 | 40,792 | 38,042 | 38,941 | 36,183 | 45,039 | 36,784 |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance, Total CECL Allowance | 386,405 | 383,292 | 379,284 | 381,441 | 371,183 | 223,499 | 379,284 | 223,499 |
Allowances (Reversals), net | (166) | 3,113 | 4,008 | 126,613 | 10,258 | 147,684 |  |  |
Total CECL Allowance, writeoff | (6,200) |  |  | (127,512) |  |  |  |  |
Ending balance, Total CECL Allowance | $ 380,039 | $ 386,405 | $ 383,292 | $ 380,542 | $ 381,441 | $ 371,183 | $ 380,039 | $ 379,284 |
General CECL allowance, % of amortized cost | 0.55% | 0.51% | 0.54% | 0.49% | 0.47% | 0.44% | 0.55% | 0.52% | 0.38%
Total CECL allowance, % of amortized cost | 4.38% | 4.29% | 4.75% | 4.64% | 4.40% | 4.29% | 4.38% | 5.07% | 2.61%
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |  |
Beginning balance, Specific CECL Allowance | $ 342,500 | $ 342,500 | $ 342,500 | $ 342,500 | $ 335,000 | $ 193,000 | $ 342,500 | $ 193,000 |
Allowances (Reversals), net | (1,300) | 0 | 0 |  | 7,500 | 142,000 |  |  |
Write-offs, specific CECL allowance, funded | (6,200) |  |  | $ (127,512) |  |  |  |  |
Ending balance, Specific CECL Allowance | $ 335,000 | $ 342,500 | $ 342,500 |  | $ 342,500 | $ 335,000 | $ 335,000 | $ 342,500 |

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