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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
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May 24, 2021 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded |  |  |  | $ 133,500 |  |  |  |  |  | $ 133,500 |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  |  |  |  | (81,890) | $ (7,000) |
Ending balance, specific CECL allowance, funded |  | $ 193,000 |  |  | $ 133,500 |  |  |  |  | 193,000 | 133,500 |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, funded |  | 32,276 | $ 30,267 | 26,224 | 21,985 | $ 23,362 | $ 21,377 | $ 33,588 |  | 26,224 | 33,588 |
Quarter allowances (reversals), General CECL allowance, funded |  | (4,971) | 2,009 | 4,043 |  | (1,377) | 1,985 | (12,211) |  |  |  |
Quarter writeoff, General CECL allowance, funded |  |  | 0 |  |  |  |  |  |  |  |  |
Ending balance, General CECL allowance, funded |  | 27,305 | 32,276 | 30,267 | 26,224 | 21,985 | 23,362 | 21,377 |  | 27,305 | 26,224 | $ 33,588
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded |  | 4,834 | 4,695 | 4,347 | 2,812 | 3,999 | 3,928 | 3,106 |  | 4,347 | 3,106 |
Quarter allowances (reversals), General CECL allowance, unfunded |  | (862) | 139 | 348 |  | (1,187) | 71 | 822 |  |  |  |
Quarter writeoff, General CECL allowance, unfunded |  |  | 0 |  |  |  |  |  |  |  |  |
Ending balance, General CECL allowance, unfunded |  | 3,972 | 4,834 | 4,695 | 4,347 | 2,812 | 3,999 | 3,928 |  | 3,972 | 4,347 | 3,106
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
General CECL Allowance |  | 37,110 | 34,962 | 30,571 | 24,797 | 27,361 | 25,305 | 36,694 |  | 30,571 | 36,694 |
General CECL Allowance |  | 31,277 | 37,110 | 34,962 | 30,571 | 24,797 | 27,361 | 25,305 |  | 31,277 | 30,571 | 36,694
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Total CECL Allowance |  | 230,110 | 168,462 | 164,071 | 143,797 | 199,361 | 200,305 | 181,694 |  | 164,071 | 181,694 |
Total CECL Allowance, Quarter allowances (reversals) |  | (5,833) | 143,628 | 4,391 |  | (55,564) | (944) | 18,611 |  |  |  |
Total CECL Allowance, writeoff |  |  | (81,980) |  |  |  |  |  |  |  |  |
Total CECL Allowance |  | $ 224,277 | $ 230,110 | $ 168,462 | $ 164,071 | $ 143,797 | $ 199,361 | $ 200,305 |  | $ 224,277 | $ 164,071 | $ 181,694
General CECL allowance, % of amortized cost |  | 0.40% | 0.46% | 0.42% | 0.36% | 0.30% | 0.33% | 0.32% |  | 0.40% | 0.36% | 0.49%
Total CECL allowance, % of amortized cost |  | 2.74% | 2.70% | 1.95% | 1.86% | 1.62% | 2.18% | 2.34% |  | 2.74% | 1.86% | 2.26%
General CECL (allowance) reversal |  |  | $ 2,100 | $ 4,400 |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net | $ 10,000 |  |  |  |  |  | $ (10,000) |  | $ 20,000 |  |  |
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 |  | $ 193,000 | 133,500 | 133,500 | 119,000 | $ 172,000 | 175,000 | $ 145,000 |  | $ 133,500 | $ 145,000 |
Increase in current expected credit loss allowance, net |  | 0 | 141,480 | 0 |  | (53,000) | (3,000) | 30,000 |  |  |  |
Write-offs, specific CECL allowance, funded |  |  | (81,980) |  |  |  |  |  |  |  |  |
Ending balance, specific CECL allowance, funded |  | 193,000 | 193,000 | 133,500 | $ 133,500 | 119,000 | 172,000 | 175,000 |  | 193,000 | $ 133,500 | $ 145,000
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Total quarter allowances (reversals), General CECL allowance |  | $ (5,833) | 2,148 | $ 4,391 |  | (2,564) | 2,056 | (11,389) |  |  |  |
General CECL Allowance writeoff |  |  | $ 0 |  |  |  |  |  |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  | $ 59,500 |  |
Commercial Mortgage and Subordinated Portfolio Segment | Residential-for-Sale - Manhattan, NY |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Total quarter allowances (reversals), General CECL allowance |  |  |  |  |  |  |  | 11,400 |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  | $ 30,000 |  |  |  |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  |  |  |  | 3,000 |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Multifamily Development - Brooklyn, NY |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  | 10,000 |  |  |  |  |
Decrease in general CECL Allowance |  |  |  |  |  |  | 2,100 |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Hotel - Atlanta, GA |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  | $ 7,000 |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Urban predevelopment - Miami, FL |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Total quarter allowances (reversals), General CECL allowance |  |  |  |  |  | 2,600 |  |  |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  | $ 53,000 |  |  |  |  |  |

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