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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 |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 24, 2021 | Dec. 31, 2020 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded |  |  |  |  | $ 145,000 | $ 68,000 |  |  | $ 145,000 |  |  |  |
Quarter allowances (reversals), specific CECL allowance, funded |  |  | $ (55,564) |  |  | (5,766) |  |  | (37,897) | [1] | $ (36,590) | [1] |
Ending balance, specific CECL allowance, funded |  |  | 119,000 |  |  |  | $ 68,000 |  | 119,000 |  |  |  |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, funded |  |  | 23,362 | $ 21,377 | 33,588 | 38,199 | 36,435 | $ 38,102 | 33,588 |  | 38,102 |  |
Quarter allowances (reversals), General CECL allowance, funded |  |  | (1,377) | 1,985 | (12,211) | (5,515) | 1,764 | (1,667) |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  | 0 |  |  |  |  |  |
Ending balance, General CECL allowance, funded |  | $ 38,102 | 21,985 | 23,362 | 21,377 | 32,684 | 38,199 | 36,435 | 21,985 |  | 32,684 |  |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded |  |  | 3,999 | 3,928 | 3,106 | 2,444 | 3,794 | 3,365 | 3,106 |  | 3,365 |  |
Quarter allowances (reversals), General CECL allowance, unfunded |  |  | (1,187) | 71 | 822 | (251) | (1,350) | 429 |  |  |  |  |
Financing receivable, funded, allowance for write-offs |  |  |  |  |  |  | 0 |  |  |  |  |  |
Ending balance, General CECL allowance, unfunded |  | 3,365 | 2,812 | 3,999 | 3,928 | 2,193 | 2,444 | 3,794 | 2,812 |  | 2,193 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
General CECL Allowance |  |  | 27,361 | 25,305 | 36,694 | 40,643 | 40,229 | 41,467 | 36,694 |  | 41,467 |  |
Total quarter allowances (reversals), General CECL allowance |  |  | (2,564) | 2,056 |  |  |  |  |  |  |  |  |
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs |  |  |  |  |  |  | 0 |  |  |  |  |  |
General CECL Allowance |  | 41,467 | 24,797 | 27,361 | 25,305 | 34,877 | 40,643 | 40,229 | 24,797 |  | 34,877 |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total CECL Allowance |  |  | 199,361 | 200,305 | 181,694 | 185,643 | 215,229 | 216,467 | 181,694 |  | 216,467 |  |
Total CECL Allowance, Quarter allowances (reversals) |  |  | (55,564) | (944) | 18,611 | (5,766) | (19,586) | (1,238) |  |  |  |  |
Total CECL allowance, Write-offs |  |  |  |  |  |  | (10,000) |  |  |  |  |  |
Total CECL Allowance |  | $ 216,467 | $ 143,797 | $ 199,361 | $ 200,305 | $ 179,877 | $ 185,643 | $ 215,229 | $ 143,797 |  | $ 179,877 |  |
General CECL allowance, % of amortized cost |  | 0.67% | 0.30% | 0.33% | 0.32% | 0.51% | 0.57% | 0.62% | 0.30% |  | 0.51% |  | 0.49%
Total CECL allowance, % of amortized cost |  | 3.23% | 1.62% | 2.18% | 2.34% | 2.43% | 2.41% | 3.06% | 1.62% |  | 2.43% |  | 2.26%
Specific CECL Allowance, net | $ 10,000 |  | $ (53,000) | $ (10,000) |  |  | $ 20,000 |  | $ (26,000) |  | $ (30,000) |  |
Hotel - Atlanta, GA |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in general CECL allowance |  |  |  | (2,100) |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded |  |  | 172,000 | 175,000 | $ 145,000 | $ 145,000 | 175,000 | $ 175,000 | 145,000 |  | 175,000 |  |
Quarter allowances (reversals), specific CECL allowance, funded |  |  | (53,000) | (3,000) | 30,000 | 0 | (20,000) | 0 |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  | (53,000) |  |  |  | (10,000) |  |  |  |  |  |
Ending balance, specific CECL allowance, funded |  | $ 175,000 | 119,000 | 172,000 | 175,000 | 145,000 | 145,000 | 175,000 | $ 119,000 |  | $ 145,000 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total quarter allowances (reversals), General CECL allowance |  |  |  |  | (11,389) | (5,766) | 414 | $ (1,238) |  |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Multifamily Development - Brooklyn, NY |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total quarter allowances (reversals), General CECL allowance |  |  |  |  |  |  | 400 |  |  |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  |  | 10,000 |  |  | $ (20,000) |  |  |  |  |  |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  | 3,000 |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Hotel - Atlanta, GA |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance, net |  |  | $ 53,000 |  |  |  |  |  |  |  |  |  |
[1] | Comprised of $53,000 and $26,000 Specific CECL Reversals and $2,564 and $11,897 of General CECL Reversals for the three and nine months ended September 30, 2022, respectively. Comprised of $0 and $30,000 Specific CECL Reversals and $5,766 and $6,590 of General CECL Reversals for the three and nine months ended September 30, 2021, respectively.

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