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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 | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |  |  |  |  |  |
Beginning balance, specific CECL allowance, funded |  |  | $ 175,000 |  |  | $ 175,000 |  |  |
Quarter allowances (reversals), specific CECL allowance, funded | [1] | $ (29,586) |  | $ (25,169) |  | (30,824) | $ 158,296 |  |
Ending balance, specific CECL allowance, funded |  | 145,000 |  |  |  | 145,000 |  |  |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, funded |  | 36,435 | 38,102 | 58,273 | $ 0 | 38,102 | 0 |  |
Quarter allowances (reversals), General CECL allowance, funded |  | 1,764 | (1,667) | (13,729) | 30,494 |  |  |  |
Financing Receivable, Funded, Allowance for Write-Offs |  | 0 |  | 0 |  |  |  |  |
Ending balance, General CECL allowance, funded |  | 38,199 | 36,435 | 44,544 | 58,273 | 38,199 | 44,544 |  |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded |  | 3,794 | 3,365 | 6,059 | 0 | 3,365 | 0 |  |
Quarter allowances (reversals), General CECL allowance, unfunded |  | (1,350) | 429 | (1,940) | 2,971 |  |  |  |
Write-offs, General CECL allowance, unfunded |  | 0 |  | 0 |  |  |  |  |
Ending balance, General CECL allowance, unfunded |  | 2,444 | 3,794 | 4,119 | 6,059 | 2,444 | 4,119 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
General CECL Allowance |  | 40,229 | 41,467 | 64,332 | 0 | 41,467 | 0 |  |
Total quarter allowances (reversals), General CECL allowance |  | 414 | (1,238) | (15,669) | 33,465 |  |  |  |
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs |  | 0 |  | 0 |  |  |  |  |
General CECL Allowance |  | 40,643 | 40,229 | 48,663 | 64,332 | 40,643 | 48,663 |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Total CECL Allowance |  | 215,229 | 216,467 | 271,313 | 56,981 | 216,467 | 56,981 |  |
Total CECL Allowance, Quarter allowances (reversals) |  | (19,586) | (1,238) | (10,169) | 183,465 |  |  |  |
Total CECL allowance, Write-offs |  | (10,000) |  | (15,000) |  |  |  |  |
Total CECL Allowance |  | $ 185,643 | $ 215,229 | $ 246,144 | $ 271,313 | $ 185,643 | $ 246,144 |  |
General CECL allowance, % of amortized cost |  | 0.57% | 0.62% | 0.81% | 1.08% | 0.57% | 0.81% | 0.67% | 0.00%
Total CECL allowance, % of amortized cost |  | 2.41% | 3.06% | 3.71% | 4.05% | 2.41% | 3.71% | 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 |  |
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 |  | $ 175,000 | $ 175,000 | $ 206,981 | 56,981 | $ 175,000 | 56,981 |  |
Quarter allowances (reversals), specific CECL allowance, funded |  | (20,000) |  | 5,500 | 150,000 |  |  |  |
Write-offs, specific CECL allowance, funded |  | (10,000) |  | (15,000) |  |  |  |  |
Ending balance, specific CECL allowance, funded |  | $ 145,000 | $ 175,000 | $ 197,481 | 206,981 | $ 145,000 | 197,481 |  |
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 $30,000, $30,000, $9,500 and $(140,500) Specific CECL Reversals (Allowance) for the three and six months ended June 30, 2021 and 2020, respectively, and $(414), $824, $15,669, and $(17,796) of General CECL Reversals (Allowance) for the three and six months ended June 30, 2021 and 2020, respectively.

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