| Line Item | Sep 30, 2026 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Interest income | — | — | ||||||||||||||
| Interest expense | — | — | ||||||||||||||
| Net interest income | — | — | ||||||||||||||
| Realized gains (losses) on mortgage-backed securities | — | — | ||||||||||||||
| Unrealized (losses) gains on mortgage-backed securities | — | — | ||||||||||||||
| Gains (losses) on derivative and other hedging instruments | — | — | ||||||||||||||
| Net portfolio (loss) income | — | — | ||||||||||||||
| Management fees | — | — | ||||||||||||||
| Allocated overhead | — | — | ||||||||||||||
| Incentive compensation | — | — | ||||||||||||||
| Directors' fees and liability insurance | — | — | ||||||||||||||
| Audit, legal and other professional fees | — | — | ||||||||||||||
| Direct REIT operating expenses | — | — | ||||||||||||||
| Other administrative | — | — | ||||||||||||||
| Total expenses | — | — | ||||||||||||||
| Net (loss) income | ||||||||||||||||
| Unrealized (losses) gains on U.S. Treasury securities measured at fair value through other comprehensive net (loss) income | ||||||||||||||||
| Comprehensive net (loss) income | — | — | ||||||||||||||
| Basic and diluted net (loss) income per share (in dollars per share) | — | — |