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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 | 12 Months Ended
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Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | 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 |  |  |  |  |  |  |  |  | (34,773) | [1] | $ 125,600 | [1] | $ 20,000
Ending balance, specific CECL allowance, funded | $ 145,000 |  |  |  | $ 175,000 |  |  |  | 145,000 |  | 175,000 |  |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, funded | 32,684 | $ 38,199 | $ 36,435 | 38,102 | 39,276 | $ 44,544 | $ 58,273 | $ 0 | 38,102 |  | 0 |  |
Quarter allowances (reversals), General CECL allowance, funded | 904 | (5,515) | 1,764 | (1,667) | (1,174) | (5,268) | (13,729) | 30,494 |  |  |  |  |
Financing Receivable, Funded, Allowance for Write-Offs |  |  | 0 |  | 0 |  | 0 |  |  |  |  |  |
Ending balance, General CECL allowance, funded | 33,588 | 32,684 | 38,199 | 36,435 | 38,102 | 39,276 | 44,544 | 58,273 | 33,588 |  | 38,102 |  | 0
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance, General CECL allowance, unfunded | 2,193 | 2,444 | 3,794 | 3,365 | 3,595 | 4,119 | 6,059 | 0 | 3,365 |  | 0 |  |
Quarter allowances (reversals), General CECL allowance, unfunded | 913 | (251) | (1,350) | 429 | (230) | (524) | (1,940) | 2,971 |  |  |  |  |
Write-offs, General CECL allowance, unfunded |  |  | 0 |  | 0 |  | 0 |  |  |  |  |  |
Ending balance, General CECL allowance, unfunded | 3,106 | 2,193 | 2,444 | 3,794 | 3,365 | 3,595 | 4,119 | 6,059 | 3,106 |  | 3,365 |  | 0
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
General CECL Allowance | 34,877 | 40,643 | 40,229 | 41,467 | 42,871 | 48,663 | 64,332 | 0 | 41,467 |  | 0 |  |
Total quarter allowances (reversals), General CECL allowance | 1,817 | (5,766) | 414 | (1,238) | (1,404) | (5,792) | (15,669) | 33,465 |  |  |  |  |
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs |  |  | 0 |  | 0 |  | 0 |  |  |  |  |  |
General CECL Allowance | 36,694 | 34,877 | 40,643 | 40,229 | 41,467 | 42,871 | 48,663 | 64,332 | 36,694 |  | 41,467 |  | 0
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Total CECL Allowance | 179,877 | 185,643 | 215,229 | 216,467 | 239,802 | 246,144 | 271,313 | 56,981 | 216,467 |  | 56,981 |  |
Total CECL Allowance, Quarter allowances (reversals) | 1,817 | (5,766) | (19,586) | (1,238) | (1,404) | (6,342) | (10,169) | 183,465 |  |  |  |  |
Total CECL allowance, Write-offs |  |  | (10,000) |  | (21,931) |  | (15,000) |  |  |  |  |  |
Total CECL Allowance | $ 181,694 | $ 179,877 | $ 185,643 | $ 215,229 | $ 216,467 | $ 239,802 | $ 246,144 | $ 271,313 | $ 181,694 |  | $ 216,467 |  | $ 56,981
General CECL allowance, % of amortized cost | 0.49% | 0.51% | 0.57% | 0.62% | 0.67% | 0.71% | 0.81% | 1.08% | 0.49% |  | 0.67% |  | 0.00%
Total CECL allowance, % of amortized cost | 2.26% | 2.43% | 2.41% | 3.06% | 3.23% | 3.59% | 3.71% | 4.05% | 2.26% |  | 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 | $ 145,000 | $ 145,000 | $ 175,000 | $ 175,000 | $ 196,931 | $ 197,481 | $ 206,981 | 56,981 | $ 175,000 |  | 56,981 |  |
Quarter allowances (reversals), specific CECL allowance, funded | 0 | 0 | (20,000) |  | 0 | (550) | 5,500 | 150,000 |  |  |  |  |
Write-offs, specific CECL allowance, funded | (10,000) |  | (10,000) |  | (21,931) |  | (15,000) |  |  |  |  |  |
Ending balance, specific CECL allowance, funded | $ 145,000 | $ 145,000 | $ 145,000 | $ 175,000 | $ 175,000 | $ 196,931 | $ 197,481 | 206,981 | $ 145,000 |  | 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 $30,000 and $(118,019) Specific CECL Reversals (Allowance) for the years ended December 31, 2021 and 2020, respectively, $4,773 and $(10,600) of General CECL Reversals (Allowance) for the years ended December 31, 2021 and 2020, respectively, and a $3,019 reversal of a previously recorded impairment on an equity investment for the year ended December 31, 2020. For the year ended December 31, 2019 the balance represents provision per loan losses as determined by the authoritative guidance at the time.

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