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Loans Receivable and Allowance for Loan Losses: Schedule of Troubled Debt Restructured Loans (Details) | 12 Months Ended
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Sep. 30, 2023 USD ($) contract | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | $ 2,495,000 | $ 2,615,000 | $ 142,000
Troubled debt restructured loan, subsequent default, number of contracts | contract | 1 |  |
Number of Contracts | loan |  |  | 1
Pre-Modification Outstanding Recorded Investment |  |  | $ 136,000
Post- Modification Outstanding Recorded Investment |  |  | 145,000
Troubled debt restructured loan, subsequent default, recorded investment | $ 0 | 0 | 0
Mortgage loans, commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 2,290,000 | 2,330,000 |
Mortgage loans, land |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  | 88,000 |
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 205,000 | 197,000 | $ 142,000
Number of Contracts | loan |  |  | 1
Pre-Modification Outstanding Recorded Investment |  |  | $ 136,000
Post- Modification Outstanding Recorded Investment |  |  | $ 145,000
Accruing |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 2,495,000 | 2,472,000 |
Accruing | Mortgage loans, commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 2,290,000 | 2,330,000 |
Accruing | Mortgage loans, land |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  | 0 |
Accruing | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 205,000 | 142,000 |
Non-Accrual |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 0 | 143,000 |
Non-Accrual | Mortgage loans, commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 0 | 0 |
Non-Accrual | Mortgage loans, land |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  | 88,000 |
Non-Accrual | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | $ 0 | $ 55,000 |

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