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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2024 | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) Loan | Mar. 31, 2023 GBP (£) Loan | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2023 GBP (£) | Mar. 31, 2023 EUR (€)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  | 100.00% |  | 100.00% |  |  |
Interest receivable |  | $ 74,981 |  |  |  |  | $ 74,981 |  | $ 72,354 |  |  |
Amortized cost of loans in cost recovery |  | 461,500 |  |  |  |  | 461,500 |  | 693,700 |  |  |
Interest received for loans in cost recovery |  | 800 |  | $ 700 |  |  | $ 1,400 | $ 1,300 |  |  |  |
Debt instrument, extension term |  |  |  |  |  |  | 2 years |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  |  |  |  | $ 0 |  | 81,890 |  |  |
Interest income from subordinate loans and other lending assets |  | 842 |  | 5,110 |  |  | 1,691 | 14,817 |  |  |  |
Proceeds from pre-payment penalties or accelerated fees |  | 700 |  | 200 |  |  | 800 | 200 |  |  |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  |  |  |  | 752,773 | 607,762 |  |  |  |
Valuation allowance, commercial mortgage loan held for sale |  | (679) |  | 0 |  |  | 0 | 0 |  |  |  |
Gain on extinguishment of debt |  |  |  | (252) |  |  | $ 0 | (465) |  |  |  |
Debt instrument, extension option |  |  |  |  |  |  | 6 months |  |  |  |  |
Office - London, United Kingdom |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from collection of loans receivable |  |  |  |  | $ 88,400 | £ 72.2 |  |  |  |  |  |
Proceeds from interest received |  |  |  |  | 700 |  |  |  |  |  |  |
Office Property - New York City |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate | 5.00% |  |  |  |  |  |  |  |  |  |  |
Office Property - New York City | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Floating rate | 3.92% |  |  |  |  |  |  |  |  |  |  |
Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan, mortgage, held-for-sale, price percentage |  | 99.50% |  |  |  |  | 99.50% |  |  |  |  |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | $ 461,500 |  |  |  |  | $ 461,500 |  | 693,700 |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in current expected credit loss allowance, net |  | 7,500 | $ 142,000 | 141,480 | $ 0 |  |  |  |  |  |  |
Specific CECL allowance increased |  | 7,500 | $ 142,000 | 141,500 |  |  | 149,500 |  |  |  |  |
Amortized cost of loans in cost recovery |  | 8,329,221 |  |  |  |  | 8,329,221 |  | 8,384,575 |  |  |
Mortgage loans on real estate, commercial and consumer, net |  | 8,300 |  |  |  |  | 8,300 |  | $ 95,500 |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  | $ 149,500 |  |  |  |  |
Write-offs, specific CECL allowance, funded |  |  |  | 81,980 |  |  |  |  |  |  |  |
Number of commercial mortgage loans | Loan |  |  |  |  | 3 | 3 |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  |  |  |  |  | 200 |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Various Properties In Europe |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  |  |  | $ 219,000 |  |  |  |  |  |  | € 205.7
Mortgage loans on real estate, commercial and consumer, funded, net |  |  |  |  | 122,400 |  |  |  |  |  |  | € 115.0
Commercial Mortgage and Subordinated Portfolio Segment | Mixed Use Property - London |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net | £ |  |  |  |  |  |  |  |  |  |  | £ 15.0 |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  |  | $ 18,200 | £ 15.0 |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  | 96.00% |  | 99.00% |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  | 441,100 |  |  |  |  | $ 441,100 |  | $ 674,500 |  |  |
Senior and Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  | 5.30% |  | 8.00% |  |  |
Junior Mezzanine B Loan |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  |  |  |  |  |  |  | $ 66,500 |  |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in Specific CECL Allowance, net |  |  |  | 126,000 |  |  |  |  |  |  |  |
Mortgage, Amortized cost | Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  | (700) |  |  |  |  | $ (700) |  |  |  |  |
Securitization Vehicle |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest income from subordinate loans and other lending assets |  |  |  | $ 1,300 |  |  |  | $ 2,500 |  |  |  |
Senior Loans |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from (repayments of) secured debt |  | $ 108,300 |  |  |  |  |  |  |  |  |  |
Cleveland Multifamily |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate | 6.00% |  |  |  |  |  |  |  |  |  |  |
Debt instrument, extension term |  |  |  |  |  |  | 2 years |  |  |  |  |
Cleveland Multifamily | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Floating rate | 3.25% |  |  |  |  |  |  |  |  |  |  |

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