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Summary of Significant Accounting Policies Text Tags (Details) - USD ($) | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2003 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2024
Accounting Policies [Abstract] |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt | $ 4,127,000 | $ 1,814,000 | $ 13,000,000 |  |  |  |
Proceeds from (Payment for) Other Financing Activity |  |  | $ 400,000 |  |  |  |
Allowance for Credit Loss, Excluding Accrued Interest | 6,129,000 | 6,242,000 |  | $ 6,321,000 | $ 6,337,000 | $ 5,955,000 | $ 5,871,000
Proceeds from Sale of Held-to-Maturity Securities | $ 0 | $ 0 |  |  |  |  |

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