| 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 | ||||||||||||||||
| Interest and fees on loans | ||||||||||||||||
| Interest on investment securities | ||||||||||||||||
| Interest on due from banks | ||||||||||||||||
| Total interest income | ||||||||||||||||
| Interest expense | ||||||||||||||||
| Interest on interest-bearing transaction accounts | ||||||||||||||||
| Interest on savings accounts | ||||||||||||||||
| Interest on money market accounts | ||||||||||||||||
| Interest on time accounts | ||||||||||||||||
| Interest on borrowings and other obligations | ||||||||||||||||
| Interest on subordinated notes | — | |||||||||||||||
| Total interest expense | ||||||||||||||||
| Net interest income | ||||||||||||||||
| (Reversal of) provision for credit losses on loans | ||||||||||||||||
| Provision for credit losses on unfunded loan commitments | ||||||||||||||||
| Net interest income after provision for credit losses | ||||||||||||||||
| Non-interest income | ||||||||||||||||
| Earnings on bank-owned life insurance, net | ||||||||||||||||
| Dividends on Federal Home Loan Bank stock | ||||||||||||||||
| Earnings on bank-owned life insurance death benefits | ||||||||||||||||
| Losses on sale of investment securities | ||||||||||||||||
| Other income | ||||||||||||||||
| Total non-interest income (loss) | ||||||||||||||||
| Non-interest expense | ||||||||||||||||
| Salaries and related benefits | ||||||||||||||||
| Occupancy and equipment | ||||||||||||||||
| Professional services | ||||||||||||||||
| Data processing | ||||||||||||||||
| Federal Deposit Insurance Corporation insurance | ||||||||||||||||
| Information technology | ||||||||||||||||
| Depreciation and amortization | ||||||||||||||||
| Directors' expense | ||||||||||||||||
| Amortization of core deposit intangible | ||||||||||||||||
| Charitable contributions | ||||||||||||||||
| Deposit network fees | ||||||||||||||||
| Other expense | ||||||||||||||||
| Total non-interest expense | ||||||||||||||||
| Income (loss) before provision for (benefit from) income taxes | ||||||||||||||||
| Provision for (benefit from) income taxes | ||||||||||||||||
| Net income (loss) | ||||||||||||||||
| Basic (in dollars per share) | ||||||||||||||||
| Diluted (in dollars per share) |