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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 | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |
Beginning balance, specific CECL allowance, funded | $ 30,836 |  |  |
Write-offs, specific CECL allowance, funded | 0 |  | $ (127,512) |
Ending balance, specific CECL allowance, funded | 34,712 |  | 30,836 |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance, General CECL allowance, funded | 30,836 | $ 26,482 | 26,482 |
Allowances (Reversals), net | 3,876 | 6,076 |  |
Quarter writeoff, General CECL allowance, funded | 0 |  |  |
Ending balance, General CECL allowance, funded | 34,712 | 32,558 | 30,836 |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance, General CECL allowance, unfunded | 5,948 | 4,017 | 4,017 |
Allowances (Reversals), net | 132 | (392) |  |
Quarter writeoff, General CECL allowance, unfunded | 0 |  |  |
Ending balance, General CECL allowance, unfunded | 6,080 | 3,625 | 5,948 |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |
General CECL Allowance | 36,784 | 30,499 | 30,499 |
Allowances (Reversals), net | 4,008 | 5,684 |  |
General CECL Allowance writeoff | 0 |  |  |
General CECL Allowance | 40,792 | 36,183 | 36,784 |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |
Total CECL Allowance | 379,284 | 223,499 | 223,499 |
Allowances (Reversals), net | 4,008 | 147,684 |  |
Total CECL Allowance, writeoff | 0 |  |  |
Total CECL Allowance | $ 383,292 | $ 371,183 | $ 379,284 |
General CECL allowance, % of amortized cost | 0.54% | 0.44% | 0.52% | 0.38%
Total CECL allowance, % of amortized cost | 4.75% | 4.29% | 5.07% | 2.61%
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |
Beginning balance, specific CECL allowance, funded | $ 342,500 | $ 193,000 | $ 193,000 |
Allowances (Reversals), net | 0 | 142,000 |  |
Write-offs, specific CECL allowance, funded | 0 |  |  |
Ending balance, specific CECL allowance, funded | 342,500 | $ 335,000 | $ 342,500 |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |
Total CECL Allowance | $ 342,500 |  |  |

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- Definition Allowance for credit loss as percent of amortized cost. + References No definition available. + Details
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