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Loans Receivable and Allowance for Loan Losses: Narrative (Details) | 12 Months Ended
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Sep. 30, 2025 USD ($) loan | Sep. 30, 2024 USD ($) loan | Sep. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Ratio of loans to appraisal or purchase price (as a percent) | 85.00% |  |
Number of loans classified as doubtful | loan | 1 | 1 |
ACL on loans increase | $ 613,000 | $ 1,661,000 |
Provision for credit losses - loans | 853,000 | 1,254,000 | $ 2,132,000
Net charge-offs | 240,000 | 461,000 |
Nonaccrual loans | 1,312,000 | 1,825,000 |
Non-accrual loans, ACL | 360,000 | 506,000 |
Non-accrual loans with no ACL | $ 3,095,000 | 2,060,000 |
Mortgage loans, one-to-four family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Ratio of loans to appraisal or purchase price (as a percent) | 85.00% |  |
Provision for credit losses - loans | $ 260,000 | 580,000 | 759,000
Ratio of loans to appraised value, private mortgage insurance requirement, percentage limit | 80.00% |  |
Mortgage loans, commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Ratio of loans to appraisal or purchase price (as a percent) | 80.00% |  |
Mortgage loans, land |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Ratio of loans to appraisal or purchase price (as a percent) | 65.00% |  |
Provision for credit losses - loans | $ 4,000 | $ 69,000 | $ 9,000

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