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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 | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2024 | Dec. 31, 2023
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded |  | $ 26,482 |  |  |  |  | $ 26,482 |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  | 0 | $ (81,890)
Ending balance, specific CECL allowance, funded | $ 35,319 |  |  |  |  |  | 35,319 | 26,482
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, funded | 32,558 | 26,482 | $ 30,267 | $ 26,224 |  |  | 26,482 | 26,224
Allowances (Reversals), net | 2,761 | 6,076 | 2,009 | 4,043 |  |  |  |
Quarter writeoff, General CECL allowance, funded |  |  | 0 |  |  |  |  |
Ending balance, General CECL allowance, funded | 35,319 | 32,558 | 32,276 | 30,267 | $ 26,224 |  | 35,319 | 26,482
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded | 3,625 | 4,017 | 4,695 | 4,347 |  |  | 4,017 | 4,347
Allowances (Reversals), net | (3) | (392) | 139 | 348 |  |  |  |
Quarter writeoff, General CECL allowance, unfunded |  |  | 0 |  |  |  |  |
Ending balance, General CECL allowance, unfunded | 3,622 | 3,625 | 4,834 | 4,695 | 4,347 |  | 3,622 | 4,017
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
General CECL Allowance | 36,183 | 30,499 | 34,962 | 30,571 |  |  | 30,499 | 30,571
Allowances (Reversals), net | 2,758 | 5,684 | 2,148 | 4,391 |  |  |  |
General CECL Allowance | 38,941 | 36,183 | 37,110 | 34,962 | 30,571 |  | 38,941 | 30,499
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Total CECL Allowance | 371,183 | 223,499 | 168,462 | 164,071 |  |  | 223,499 | 164,071
Allowances (Reversals), net | 10,258 | 147,684 | 143,628 | 4,391 |  |  |  |
Total CECL Allowance, writeoff |  |  | (81,980) |  |  |  |  |
Total CECL Allowance | $ 381,441 | $ 371,183 | $ 230,110 | $ 168,462 | $ 164,071 |  | $ 381,441 | $ 223,499
General CECL allowance, % of amortized cost | 0.47% | 0.44% | 0.46% | 0.42% | 0.36% |  | 0.47% | 0.38%
Total CECL allowance, % of amortized cost | 4.40% | 4.29% | 2.70% | 1.95% | 1.86% |  | 4.40% | 2.61%
Residential-for-Sale - Manhattan, NY |  |  |  |  |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  | $ (7,000) | $ (7,000) |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded | $ 335,000 | $ 193,000 | $ 133,500 | $ 133,500 |  |  | $ 193,000 | $ 133,500
Allowances (Reversals), net | 7,500 | 142,000 | 141,480 | 0 |  |  |  |
Write-offs, specific CECL allowance, funded |  |  | (81,980) |  |  |  |  |
Ending balance, specific CECL allowance, funded | $ 342,500 | $ 335,000 | 193,000 | $ 133,500 | $ 133,500 |  | $ 342,500 | $ 193,000
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
General CECL Allowance writeoff |  |  | $ 0 |  |  |  |  |

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