| 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: | ||||||||||||||||
| Loans, including fees | ||||||||||||||||
| Interest-bearing deposits in banks and other | ||||||||||||||||
| Total interest income | ||||||||||||||||
| Interest expense: | ||||||||||||||||
| Deposits | ||||||||||||||||
| Borrowings | ||||||||||||||||
| Total interest expense | ||||||||||||||||
| Net interest income | ||||||||||||||||
| Provision for credit losses | ||||||||||||||||
| Net interest income after provision for credit losses | ||||||||||||||||
| Noninterest income: | ||||||||||||||||
| Loan servicing income, net | ||||||||||||||||
| Gain (loss) on sale of government guaranteed loans, net | ||||||||||||||||
| Service charges and fees | ||||||||||||||||
| Government guaranteed loans fair value gain (loss), net | ||||||||||||||||
| Government guaranteed loan packaging fees | ||||||||||||||||
| Loss on nonmarketable equity securities | — | — | — | |||||||||||||
| Loss on premises and equipment | — | — | ||||||||||||||
| Other noninterest income | ||||||||||||||||
| Total noninterest income | ||||||||||||||||
| Noninterest expense: | ||||||||||||||||
| Salaries and benefits | ||||||||||||||||
| Bonus, commissions, and incentives | ||||||||||||||||
| Occupancy and equipment | ||||||||||||||||
| Data processing | ||||||||||||||||
| Marketing and business development | ||||||||||||||||
| Professional services | ||||||||||||||||
| Loan servicing and origination expense | ||||||||||||||||
| Employee recruiting and development | ||||||||||||||||
| Regulatory assessments | ||||||||||||||||
| Other noninterest expense | ||||||||||||||||
| Total noninterest expense | ||||||||||||||||
| Loss before income taxes | ||||||||||||||||
| Income tax expense (benefit) | ||||||||||||||||
| Net loss | ||||||||||||||||
| Preferred stock dividends | ||||||||||||||||
| Net loss attributable to common shareholders | ||||||||||||||||
| Basic loss per common share (in dollars per share) | — | |||||||||||||||
| Diluted loss per common share (in dollars per share) | — |