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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2024 | Feb. 28, 2025
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 | $ 61,047 |  | $ 61,047 |  |  |  | $ 58,470 |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  | Secured Overnight Financing Rate [Member] |  |  |  |  |  |
Amortized cost of loans in cost recovery | 499,900 |  | $ 499,900 |  |  |  | 486,800 |  |
Interest received for loans in cost recovery |  |  | 600 |  |  | $ 600 |  |  |
Unfunded commitments | 6,080 |  | 6,080 |  |  |  | 5,948 |  |
Mortgage loans on real estate, commercial and consumer, net | 7,687,086 |  | 7,687,086 |  |  |  | 7,104,156 |  |
Note receivable, held for sale | 41,200 |  | 41,200 |  |  |  | 41,200 |  |
Write-offs, specific CECL allowance, funded |  |  | 0 |  |  |  | 127,512 |  |
Interest income from subordinate loans and other lending assets |  |  | 557 |  |  | 849 |  |  |
Proceeds from pre-payment penalties or accelerated fees |  |  | 0 |  |  | 100 |  |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  | 138,024 |  |  | 168,526 |  |  |
Valuation allowance, commercial mortgage loan held for sale |  |  | $ 0 |  |  | $ (679) |  |  |
Multifamily Property in Miami Gardens, Florida |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net |  |  |  |  |  |  |  |  | $ 114,000
Office Property - New York City |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Floating rate |  |  |  |  | 3.92% |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |
Fixed rate |  |  |  |  | 5.00% |  |  |  |
Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loan, mortgage, held-for-sale, price percentage |  |  | 99.50% |  |  | 99.50% |  |  |
Massachusetts Healthcare |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Equity method interest in joint venture | 23,000 |  | $ 23,000 |  |  |  | 20,100 |  |
Past Due 90 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery | 499,900 |  | 499,900 |  |  |  | 486,800 |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Increase in current expected credit loss allowance, net |  |  | 0 |  |  | $ 142,000 |  |  |
Unfunded commitments | 10,300 |  | 10,300 |  |  |  | 10,600 |  |
Mortgage loans on real estate, commercial and consumer, net | 4,200 |  | 4,200 |  |  |  | 8,300 |  |
Write-offs, specific CECL allowance, funded |  |  | 0 |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, net | 402,064 | [1] | $ 402,064 | [1] |  |  | $ 388,809 | [1] | $ 24,000
Proceeds received from the repayment and sale of commercial mortgage loans | 24,000 |  |  |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  | 95.00% |  |  |  | 95.00% |  |
Senior and Junior Mezzanine Loans |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  | 9.50% |  |  |  | 10.10% |  |
Modified receivables | $ 735,800 |  | $ 735,800 |  |  |  | $ 721,700 |  |
Junior Mezzanine A Loan | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Specific CECL allowance increased |  |  |  |  |  | 142,000 |  |  |
Mortgage, Amortized cost | Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases receivable, gain (loss) on sales, net |  |  |  |  |  | $ 700 |  |  |
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] |  |  |  |  |  |  |  |  |
Floating rate |  |  |  |  | 3.25% |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |
Fixed rate |  |  |  |  | 6.00% |  |  |  |
Debt instrument, extension term |  |  | 2 years |  |  |  |  |  |
[1] | Net of $377,212 and $373,336 CECL Allowances comprised $34,712 and $30,836 General CECL Allowance in 2025 and 2024, respectively, and $342,500 Specific CECL Allowance in 2025 and 2024.

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