| 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 and fee income: | ||||||||||||||||
| Loans, including fees | ||||||||||||||||
| Taxable securities | ||||||||||||||||
| Nontaxable securities | ||||||||||||||||
| Interest-bearing deposits in banks | ||||||||||||||||
| Total interest and fee income | ||||||||||||||||
| Interest expense: | ||||||||||||||||
| Deposits | ||||||||||||||||
| Subordinated notes | ||||||||||||||||
| Total interest expense | ||||||||||||||||
| Net interest income | ||||||||||||||||
| Provision for credit losses | ||||||||||||||||
| Net interest income after provision for credit losses | ||||||||||||||||
| Non-interest income: | ||||||||||||||||
| Service charges on deposit accounts | ||||||||||||||||
| Gain on sale of loans | ||||||||||||||||
| Loan-related fees | ||||||||||||||||
| FHLB stock dividends | ||||||||||||||||
| Earnings on bank-owned life insurance (“BOLI”) | ||||||||||||||||
| Other | ||||||||||||||||
| Total non-interest income | ||||||||||||||||
| Non-interest expense: | ||||||||||||||||
| Salaries and employee benefits | ||||||||||||||||
| Occupancy and equipment | ||||||||||||||||
| Data processing and software | ||||||||||||||||
| Federal Deposit Insurance Corporation (“FDIC”) insurance | ||||||||||||||||
| Professional services | ||||||||||||||||
| Advertising and promotional | ||||||||||||||||
| Loan-related expenses | ||||||||||||||||
| Other operating expenses | ||||||||||||||||
| Total non-interest expense | ||||||||||||||||
| Income before provision for income taxes | ||||||||||||||||
| Provision for income taxes | ||||||||||||||||
| Net income | ||||||||||||||||
| Basic earnings per common share (in USD per share) | — | |||||||||||||||
| Diluted earnings per common share (in USD per share) | — |