| Line Item | Jun 30, 2026 | Mar 31, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Dec 31, 2022 | Sep 30, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Interest income: | ||||||||||||||||
| Commercial mortgage loans held-for-investment | ||||||||||||||||
| Cash and cash equivalents | ||||||||||||||||
| Interest expense: | ||||||||||||||||
| Securitized debt obligations | — | — | ||||||||||||||
| Secured financing agreements | — | — | ||||||||||||||
| Secured term loan | ||||||||||||||||
| Net interest income | ||||||||||||||||
| Expenses: | ||||||||||||||||
| Management and incentive fees | ||||||||||||||||
| General and administrative expenses | ||||||||||||||||
| Operating expenses reimbursable to Manager | ||||||||||||||||
| Other operating expenses | ||||||||||||||||
| Compensation expense | ||||||||||||||||
| Total expenses | ||||||||||||||||
| Other income and expense: | ||||||||||||||||
| Provision for credit losses, net | ||||||||||||||||
| Net (expense) from real estate owned operations | ||||||||||||||||
| Gain on sale of real estate owned | — | — | — | |||||||||||||
| Real estate owned impairment expense | — | — | ||||||||||||||
| Change in unrealized (loss) on mortgage servicing rights | ||||||||||||||||
| Loss on extinguishment of debt | — | — | ||||||||||||||
| Servicing income, net | ||||||||||||||||
| Total other income and expense | — | |||||||||||||||
| Net (loss) income before provision for income taxes | ||||||||||||||||
| Benefit from (provision for) income taxes | ||||||||||||||||
| Net (loss) income | ||||||||||||||||
| Dividends accrued to preferred stockholders | ||||||||||||||||
| Net (loss) income attributable to common stockholders | ||||||||||||||||
| Earnings per share: | ||||||||||||||||
| Net (loss) income attributable to common stockholders (basic) | — | — | ||||||||||||||
| Net (loss) income attributable to common stockholders (diluted) | — | |||||||||||||||
| Basic income per share (in dollars per share) | ||||||||||||||||
| Diluted income per share (in dollars per share) | ||||||||||||||||
| Dividends declared per share of common stock (in dollars per share) | — |