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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 | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |
Beginning balance, specific CECL allowance, funded | $ 145,000 |  |
Ending balance, specific CECL allowance, funded | 133,500 | $ 145,000 |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance, General CECL allowance, funded | 33,588 | 38,102 |
Quarter allowances (reversals), General CECL allowance, funded | (7,364) | (4,514) |
Write-offs, specific CECL allowance, funded | 0 | 0 |
Ending balance, General CECL allowance, funded | 26,224 | 33,588 |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning balance, General CECL allowance, unfunded | 3,106 | 3,365 |
Quarter allowances (reversals), General CECL allowance, unfunded | 1,241 | (259) |
Financing receivable, funded, allowance for write-offs | 0 | 0 |
Ending balance, General CECL allowance, unfunded | 4,347 | 3,106 |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |
General CECL Allowance | 36,694 | 41,467 |
Allowance for loan and lease losses, real estate and off-balance sheet, write-offs | 0 | 0 |
General CECL Allowance | 30,571 | 36,694 |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |
Total CECL Allowance | 181,694 | 216,467 |
Total CECL Allowance, Quarter allowances (reversals) | 7,273 | (24,773) |
Total CECL allowance, Write-offs | (24,896) | (10,000) |
Total CECL Allowance | $ 164,071 | $ 181,694 |
General CECL allowance, % of amortized cost | 0.36% | 0.49% | 0.67%
Total CECL allowance, % of amortized cost | 1.86% | 2.26% | 3.23%
General CECL (allowance) reversal | $ (6,100) | $ (4,800) |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |
Beginning balance, specific CECL allowance, funded | 145,000 | 175,000 |
Increase (decrease) in current expected credit loss allowance, net | 13,396 | (20,000) |
Write-offs, specific CECL allowance, funded | (24,896) | (10,000) |
Ending balance, specific CECL allowance, funded | 133,500 | 145,000 |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |
Total quarter allowances (reversals), General CECL allowance | $ (6,123) | $ (4,773) |

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