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Loans Receivable and Allowance for Loan Losses: Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Ratio of loans to appraisal or purchase price (as a percent) | 85.00% |  |
Allowance for credit losses | $ 17,478,000 | $ 15,817,000 |
ACL on loans increase | 1,661,000 |  |
Provision for credit losses - loans | 1,254,000 | 2,132,000 | $ 270,000
Adjustment to opening balance | 461,000 |  |
Nonaccrual loans | 1,825,000 |  |
Non-accrual loans, ACL | 506,000 |  |
Non-accrual loans with no ACL | $ 2,060,000 |  |
Troubled debt restructured loan |  | 2,500,000 |
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 | $ 580,000 | 759,000 | 504,000
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 | $ 69,000 | $ 9,000 | $ (73,000)

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