| 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 |
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| Interest income: | ||||||||||||||||
| Cash and investments | ||||||||||||||||
| Total interest income | ||||||||||||||||
| Total interest expense | ||||||||||||||||
| Net interest income (loss) | ||||||||||||||||
| Less: provisions for loan losses | ||||||||||||||||
| Net interest income (loss) after provisions for loan losses | ||||||||||||||||
| Other income (loss): | ||||||||||||||||
| Servicing revenue | ||||||||||||||||
| Asset recovery and business processing revenue | ||||||||||||||||
| Other income | ||||||||||||||||
| Gain on sale of subsidiary | — | — | ||||||||||||||
| Gains (losses) on derivative and hedging activities, net | ||||||||||||||||
| Total other income (loss) | ||||||||||||||||
| Expenses: | ||||||||||||||||
| Salaries and benefits | ||||||||||||||||
| Other operating expenses | ||||||||||||||||
| Total operating expenses | ||||||||||||||||
| Goodwill and acquired intangible asset impairment and amortization expense | ||||||||||||||||
| Restructuring/other reorganization expenses | ||||||||||||||||
| Total expenses | ||||||||||||||||
| Income before income tax expense | ||||||||||||||||
| Income tax expense | ||||||||||||||||
| Net income | ||||||||||||||||
| Basic earnings per common share | ||||||||||||||||
| Diluted earnings per common share |