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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |
Quarter allowances (reversals), specific CECL allowance, funded | [1] | $ (6,342) |  |  | $ 35,000 | $ 151,954 | $ 20,000 |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, funded |  | 44,544 | $ 58,273 | $ 0 |  | 0 |  |
Quarter allowances (reversals), General CECL allowance, funded |  | (5,268) | (13,729) | 30,494 |  |  |  |
Realized loss, General CECL allowance, funded |  |  | 0 |  |  |  |  |
Ending balance, General CECL allowance, funded |  | 39,276 | 44,544 | 58,273 |  | 39,276 |  |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded |  | 4,119 | 6,059 | 0 |  | 0 |  |
Quarter allowances (reversals), General CECL allowance, unfunded |  | (524) | (1,940) | 2,971 |  |  |  |
Realized loss, General CECL allowance, unfunded |  |  | 0 |  |  |  |  |
Ending balance, General CECL allowance, unfunded |  | 3,595 | 4,119 | 6,059 |  | 3,595 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
General CECL Allowance |  | 48,663 | 64,332 | 0 |  | 0 |  |
Total quarter allowances (reversals), General CECL allowance |  | (5,792) | (15,669) | 33,465 |  |  |  |
Total, realized loss, General CECL allowance |  |  | 0 |  |  |  |  |
General CECL Allowance |  | 42,871 | 48,663 | 64,332 |  | 42,871 |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Total CECL Allowance |  | 246,144 | 271,313 | 56,981 |  | 56,981 |  |
Total CECL Allowance, Quarter allowances (reversals) |  | (6,342) | (10,169) | 183,465 |  |  |  |
Total CECL allowance, realized loss |  |  | (15,000) |  |  |  |  |
Total CECL Allowance |  | $ 239,802 | $ 246,144 | $ 271,313 |  | $ 239,802 |  |
General CECL allowance, % of amortized cost |  | 0.71% | 0.81% | 1.08% |  | 0.71% |  | 0.00%
Total CECL allowance, % of amortized cost |  | 3.59% | 3.71% | 4.05% |  | 3.59% |  | 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 |  |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded |  |  |  | 3,088 |  | 3,088 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
General CECL Allowance |  |  |  | 30,867 |  | 30,867 |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Total CECL Allowance |  |  |  | 30,867 |  | 30,867 |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded |  | $ 197,481 | $ 206,981 | 56,981 |  | 56,981 |  |
Quarter allowances (reversals), specific CECL allowance, funded |  | (550) | 5,500 | 150,000 |  |  |  |
Realized Loss, specific CECL allowance, funded |  |  | (15,000) |  |  |  |  |
Ending balance, specific CECL allowance, funded |  | 196,931 | $ 197,481 | 206,981 |  | 196,931 |  |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |
Ending balance, General CECL allowance, unfunded |  | $ 3,600 |  |  |  | 3,600 |  |
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 |  |
[1] | Comprised of $550 and $(139,950) of Specific CECL Reversal (Allowance) and $5,792 and $(12,004) of General CECL Reversal (Allowance) for the three and nine months ended September 30, 2020, respectively.

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