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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 | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 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 |  | $ 65,482 |  |  |  |  |  | $ 65,482 |  |  | $ 58,470 |  |
Amortized cost of loans in cost recovery |  | 375,000 |  |  |  |  |  | 375,000 |  |  | 486,800 |  |
Interest received for loans in cost recovery |  | 200 |  | $ 7,000 |  |  |  | 1,200 |  | $ 8,300 |  |  |
Unfunded commitments |  | 5,782 |  |  |  |  |  | 5,782 |  |  | 5,948 |  |
Commercial mortgage loans, net |  | 8,303,645 |  |  |  |  |  | 8,303,645 |  |  | 7,104,156 |  |
Note receivable, held for sale |  | 0 |  |  |  |  |  | 0 |  |  | 41,200 |  |
Proceeds from pre-payment penalties or accelerated fees |  | 1,400 |  | 4,200 |  |  |  | 1,900 |  | 5,100 |  |  |
Payment in kind interest |  | 5,100 |  | 0 |  |  |  | 5,500 |  | 0 |  |  |
Proceeds received from the repayment and sale of commercial mortgage loans |  |  |  |  |  |  |  | 1,939,560 |  | $ 1,580,003 |  |  |
Multifamily Property in Miami Gardens, Florida |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage loans, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 114,000
Hotel - Honolulu, Hi |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan, mortgage, held-for-sale, price percentage |  |  |  |  | 99.50% |  |  |  |  |  |  |  |
Past Due 90 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost of loans in cost recovery |  | 375,000 |  |  |  |  |  | $ 375,000 |  |  | 486,800 |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  | 5.30% |  |  |  |  |
Unfunded commitments |  | 104,000 |  |  |  |  |  | $ 104,000 |  |  | 5,100 |  |
Commercial mortgage loans, net |  | 61,200 |  |  |  |  |  | 61,200 |  |  | 8,300 |  |
Modified receivables |  | 438,900 |  |  |  |  |  | 438,900 |  |  | 378,300 |  |
Specific CECL Allowance |  | 6,200 |  | 127,500 | $ 7,500 |  |  |  |  |  |  |  |
Realized loss on investments |  | 6,200 |  | $ 127,500 |  |  |  |  |  |  |  |  |
Commercial Mortgage and Subordinated Portfolio Segment | Michigan Office |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance |  |  |  |  | 7,500 |  |  |  |  |  |  |  |
Realized loss on investments |  | 6,200 |  |  |  |  |  | 6,200 |  |  |  |  |
Discounted payoff and received proceeds |  | 1,300 |  |  |  |  |  |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage loans, net |  | 153,790 | [1] |  |  |  |  | 153,790 | [1] |  | $ 388,809 | [1] | $ 24,000
Proceeds received from the repayment and sale of commercial mortgage loans | $ 24,000 |  |  |  |  |  |  |  |  |  |  |  |
Commercial Mortgage Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment of loan to finance future leasing costs |  | $ 77,400 |  |  |  |  |  | $ 77,400 |  |  |  |  |
Modified include PIK Interest accruing fixed rate of interest not received in cash percentage |  | 10.00% |  |  |  |  |  |  |  |  |  |  |
Floating Rate Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans on real estate, commercial and consumer, percentage of portfolio |  |  |  |  |  |  |  | 98.00% |  |  | 95.00% |  |
Junior Mezzanine A Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Specific CECL Allowance |  |  |  |  |  | $ 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) |  | $ (700) |  |  |  |  |  |
[1] | Net of $374,257 and $373,336 CECL Allowances comprised $39,257 and $30,836 General CECL Allowance in 2025 and 2024, respectively, and $335,000 and $342,500 Specific CECL Allowance in 2025 and 2024, respectively.

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