| 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 and leases, including fees | ||||||||||||||||
| Investment securities: | ||||||||||||||||
| Investment securities available-for-sale | ||||||||||||||||
| Investment securities held-to-maturity | ||||||||||||||||
| Total investment income | ||||||||||||||||
| Dividends from FHLB, FRB, and other stock | ||||||||||||||||
| Interest-earning deposits with other institutions | ||||||||||||||||
| Total interest income | ||||||||||||||||
| Interest expense: | ||||||||||||||||
| Deposits | ||||||||||||||||
| Borrowings and customer repurchase agreements | ||||||||||||||||
| Subordinated debentures | — | — | — | |||||||||||||
| Other | ||||||||||||||||
| Total interest expense | ||||||||||||||||
| Net interest income before provision for (recapture of) credit losses | ||||||||||||||||
| Provision for (recapture of) credit losses | ||||||||||||||||
| Net interest income after provision for (recapture of) credit losses | ||||||||||||||||
| Noninterest income: | ||||||||||||||||
| BOLI income | ||||||||||||||||
| Loss on sale of AFS investment securities | — | — | ||||||||||||||
| Gain on sale leaseback transactions | — | — | ||||||||||||||
| Other | ||||||||||||||||
| Total noninterest income | ||||||||||||||||
| Noninterest expense: | ||||||||||||||||
| Salaries and employee benefits | ||||||||||||||||
| Occupancy and equipment | ||||||||||||||||
| Professional services | ||||||||||||||||
| Computer software expense | ||||||||||||||||
| Marketing and promotion | ||||||||||||||||
| Amortization of intangible assets | ||||||||||||||||
| Provision for unfunded loan commitments | ||||||||||||||||
| Acquisition related expenses | — | — | ||||||||||||||
| Other | ||||||||||||||||
| Total noninterest expense | ||||||||||||||||
| Earnings before income taxes | ||||||||||||||||
| Income tax expense | ||||||||||||||||
| Net earnings | ||||||||||||||||
| Other comprehensive income | ||||||||||||||||
| Unrealized (loss) gain on securities and derivatives arising during the period, before tax | ||||||||||||||||
| Less: Income tax benefit (expense) related to items of other comprehensive income | ||||||||||||||||
| Other comprehensive (loss) income, net of tax | ||||||||||||||||
| Comprehensive income | ||||||||||||||||
| Basic earnings per common share | — | |||||||||||||||
| Diluted earnings per common share | — |