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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 |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |
Beginning balance, specific CECL allowance, funded | $ 133,500 |  |  |
Ending balance, specific CECL allowance, funded | 133,500 |  |  |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance, General CECL allowance, funded | 26,224 | $ 33,588 |  |
Quarter allowances (reversals), General CECL allowance, funded | 4,043 | (12,211) |  |
Ending balance, General CECL allowance, funded | 30,267 | 21,377 |  |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance, General CECL allowance, unfunded | 4,347 | 3,106 |  |
Quarter allowances (reversals), General CECL allowance, unfunded | 348 | 822 |  |
Ending balance, General CECL allowance, unfunded | 4,695 | 3,928 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |
General CECL Allowance | 30,571 | 36,694 |  |
General CECL Allowance | 34,962 | 25,305 |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |
Total CECL Allowance | 164,071 | 181,694 |  |
Total CECL Allowance, Quarter allowances (reversals) | 4,391 | 18,611 |  |
Total CECL Allowance | $ 168,462 | $ 200,305 |  |
General CECL allowance, % of amortized cost | 0.42% | 0.32% | 0.36% | 0.49%
Total CECL allowance, % of amortized cost | 1.95% | 2.34% | 1.86% | 2.26%
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |
Beginning balance, specific CECL allowance, funded | $ 133,500 | $ 145,000 |  |
Increase in current expected credit loss allowance, net | 0 | 30,000 |  |
Ending balance, specific CECL allowance, funded | 133,500 | 175,000 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |
Total quarter allowances (reversals), General CECL allowance | $ 4,391 | $ (11,389) |  |

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- Definition Allowance For Loan And Lease Losses, Including Loan Specific, Real Estate And Off-Balance Sheet, Credit Loss, Expense (Reversal) + References No definition available. + Details
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- Definition Allowance For Loan And Lease Losses, Including Loan Specific, Real Estate And Off-Balance Sheet, Credit Loss, Liability + References No definition available. + Details
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- Definition Allowance For Loan And Lease Losses, Including Loan Specific, Real Estate And Off-Balance Sheet, Credit Loss, Liability, Percent Of Amortized Cost + References No definition available. + Details
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- Definition Allowance For Loan And Lease Losses, Real Estate And Off-Balance Sheet, Credit Loss, Expense (Reversal) + References No definition available. + Details
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- Definition Allowance For Loan And Lease Losses, Real Estate And Off-Balance Sheet, Credit Loss, Liability + References No definition available. + Details
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- Definition Allowance For Loan And Lease Losses, Real Estate And Off-Balance Sheet, Credit Loss, Liability, Percent Of Amortized Cost + References No definition available. + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
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