| Line Item | Jun 30, 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: | |||||||||||||||
| Residential whole loans | |||||||||||||||
| Securities, at fair value | |||||||||||||||
| Other interest-earning assets | |||||||||||||||
| Cash and cash equivalent investments | |||||||||||||||
| Interest Income | |||||||||||||||
| Interest Expense: | |||||||||||||||
| Asset-backed and other collateralized financing arrangements | |||||||||||||||
| Other interest expense | |||||||||||||||
| Interest Expense | |||||||||||||||
| Net Interest Income | |||||||||||||||
| Reversal/(Provision) for Credit Losses on Residential Whole Loans | |||||||||||||||
| Reversal/(Provision) for Credit Losses on Other Assets | |||||||||||||||
| Net Interest Income/(Expense) after Reversal/(Provision) for Credit Losses | |||||||||||||||
| Other Income/(Loss), net: | |||||||||||||||
| Net gain/(loss) on residential whole loans measured at fair value through earnings | |||||||||||||||
| Impairment and other net gain/(loss) on securities and other portfolio investments | |||||||||||||||
| Net gain/(loss) on real estate owned | |||||||||||||||
| Net gain/(loss) on derivatives | — | — | |||||||||||||
| Net gain/(loss) on securitized debt measured at fair value through earnings | |||||||||||||||
| Lima One mortgage banking income | |||||||||||||||
| Net realized gain/(loss) on residential whole loans held at carrying value | |||||||||||||||
| Other, net | |||||||||||||||
| Other Income/(Loss), net | |||||||||||||||
| Operating and Other Expense: | |||||||||||||||
| Compensation and benefits | |||||||||||||||
| Other general and administrative expense | |||||||||||||||
| Loan servicing, financing and other related costs | |||||||||||||||
| Amortization of intangible assets | |||||||||||||||
| Operating and Other Expense | |||||||||||||||
| Income/(loss) before income taxes | |||||||||||||||
| Provision for/(benefit from) income taxes | |||||||||||||||
| Net Income/(Loss) | |||||||||||||||
| Less Preferred Stock Dividend Requirement | |||||||||||||||
| Net Income/(Loss) Available to Common Stock and Participating Securities | |||||||||||||||
| Basic Earnings/(Loss) per Common Share (in dollars per share) | — | ||||||||||||||
| Diluted Earnings/(Loss) per Common Share (in dollars per share) | — |