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Commercial Mortgage, 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
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |
Quarter allowances (reversals), specific CECL allowance, funded | [1] |  |  |  |  | $ 125,600 | $ 20,000 | $ 20,000
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, funded |  | $ 39,276 | $ 44,544 | $ 58,273 | $ 0 | 0 |  |
Quarter allowances (reversals), General CECL allowance, funded |  | (1,174) | (5,268) | (13,729) | 30,494 |  |  |
Financing Receivable, Funded, Allowance for Write-Offs |  | 0 |  | 0 |  |  |  |
Ending balance, General CECL allowance, funded |  | 38,102 | 39,276 | 44,544 | 58,273 | 38,102 | 0 |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded |  | 3,595 | 4,119 | 6,059 | 0 | 0 |  |
Quarter allowances (reversals), General CECL allowance, unfunded |  | (230) | (524) | (1,940) | 2,971 |  |  |
Write-offs, General CECL allowance, unfunded |  | 0 |  | 0 |  |  |  |
Ending balance, General CECL allowance, unfunded |  | 3,365 | 3,595 | 4,119 | 6,059 | 3,365 | 0 |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
General CECL Allowance |  | 42,871 | 48,663 | 64,332 | 0 | 0 |  |
Total quarter allowances (reversals), General CECL allowance |  | (1,404) | (5,792) | (15,669) | 33,465 |  |  |
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs |  | 0 |  | 0 |  |  |  |
General CECL Allowance |  | 41,467 | 42,871 | 48,663 | 64,332 | 41,467 | 0 |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Total CECL Allowance |  | 239,802 | 246,144 | 271,313 | 56,981 | 56,981 |  |
Total CECL Allowance, Quarter allowances (reversals) |  | (1,404) | (6,342) | (10,169) | 183,465 |  |  |
Total CECL allowance, Write-offs |  | (21,931) |  | (15,000) |  |  |  |
Total CECL Allowance |  | $ 216,467 | $ 239,802 | $ 246,144 | $ 271,313 | $ 216,467 | $ 56,981 |
General CECL allowance, % of amortized cost |  | 0.67% | 0.71% | 0.81% | 1.08% | 0.67% | 0.00% |
Total CECL allowance, % of amortized cost |  | 3.23% | 3.59% | 3.71% | 4.05% | 3.23% | 0.00% |
Adjustment due to Adoption of ASU |  |  |  |  |  |  |  |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, funded |  |  |  |  | $ 27,779 | $ 27,779 |  |
Ending balance, General CECL allowance, funded |  |  |  |  |  |  | $ 27,779 |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded |  |  |  |  | 3,088 | 3,088 |  |
Ending balance, General CECL allowance, unfunded |  |  |  |  |  |  | 3,088 |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
General CECL Allowance |  |  |  |  | 30,867 | 30,867 |  |
General CECL Allowance |  |  |  |  |  |  | 30,867 |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Total CECL Allowance |  |  |  |  | 30,867 | 30,867 |  |
Total CECL Allowance |  |  |  |  |  |  | 30,867 |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded |  | $ 196,931 | $ 197,481 | $ 206,981 | 56,981 | 56,981 |  |
Quarter allowances (reversals), specific CECL allowance, funded |  |  | (550) | 5,500 | 150,000 |  |  |
Write-offs, specific CECL allowance, funded |  | (21,931) |  | (15,000) |  |  |  |
Ending balance, specific CECL allowance, funded |  | $ 175,000 | $ 196,931 | $ 197,481 | 206,981 | 175,000 | 56,981 |
Commercial Mortgage and Subordinated Portfolio Segment | Adjustment due to Adoption of ASU |  |  |  |  |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded |  |  |  |  | $ 0 | $ 0 |  |
Ending balance, specific CECL allowance, funded |  |  |  |  |  |  | $ 0 |
[1] | Comprised of $118,019 of Specific CECL Allowance, $10,600 of General CECL Allowance, and a $3,019 reversal of a previously recorded impairment on an equity investment for the year ended December 31, 2020, respectively. For the years ended December 31, 2019 and 2018 the balance represents provision per loan losses as determined by the authoritative guidance at the time.

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