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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, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |
Beginning balance, specific CECL allowance, funded | $ 193,000 |  |  |
Ending balance, specific CECL allowance, funded | 335,000 |  |  |
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance, General CECL allowance, funded | 26,482 | $ 26,224 |  |
Allowances (Reversals), net | 6,076 | 4,043 |  |
Ending balance, General CECL allowance, funded | 32,558 | 30,267 |  |
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance, General CECL allowance, unfunded | 4,017 | 4,347 |  |
Allowances (Reversals), net | (392) | 348 |  |
Ending balance, General CECL allowance, unfunded | 3,625 | 4,695 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |
General CECL Allowance | 30,499 | 30,571 |  |
General CECL Allowance | 36,183 | 34,962 |  |
Financing Receivable, Total Allowance for Credit Loss [Roll Forward] |  |  |  |
Total CECL Allowance | 223,499 | 164,071 |  |
Allowances (Reversals), net | 147,684 | 4,391 |  |
Total CECL Allowance | $ 371,183 | $ 168,462 |  |
General CECL allowance, % of amortized cost | 0.44% | 0.42% | 0.38% | 0.36%
Total CECL allowance, % of amortized cost | 4.29% | 1.95% | 2.61% | 1.86%
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |
Allowance and Provision for Loan Credit Loss [Abstract] |  |  |  |
Beginning balance, specific CECL allowance, funded | $ 193,000 | $ 133,500 |  |
Allowances (Reversals), net | 142,000 | 0 |  |
Ending balance, specific CECL allowance, funded | 335,000 | 133,500 |  |
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward] |  |  |  |
Allowances (Reversals), net | $ 5,684 | $ 4,391 |  |

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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482454/460-10-45-1 + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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