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Loans Receivable and Allowance for Loan Losses: Schedule of Troubled Debt Restructured Loans (Details) | 12 Months Ended
--- | ---
Sep. 30, 2020 USD ($) contract | Sep. 30, 2019 USD ($) contract | Sep. 30, 2018 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | $ 3,071,000 | $ 3,269,000 |
Troubled debt restructured loan, subsequent default, number of contracts | contract | 0 | 1 | 3
Troubled debt restructured loan, subsequent default, recorded investment | $ 0 | $ 0 | $ 0
Portfolio Segment |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  | $ 82,000 | $ 323,000
Number of Contracts | contract |  | 1 | 3
Pre-Modification Outstanding Recorded Investment |  | $ 85,000 | $ 427,000
Post- Modification Outstanding Recorded Investment |  | 85,000 | 338,000
Mortgage loans, land |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 130,000 |  |
Mortgage loans, land | Portfolio Segment |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  | $ 82,000 |
Number of Contracts | contract |  | 1 |
Pre-Modification Outstanding Recorded Investment |  | $ 85,000 |
Post- Modification Outstanding Recorded Investment |  | 85,000 |
Commercial business loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  | 143,000 |
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 483,000 | 634,000 |
Mortgage loans, one-to-four family | Portfolio Segment |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  |  | $ 153,000
Number of Contracts | contract |  |  | 1
Pre-Modification Outstanding Recorded Investment |  |  | $ 244,000
Post- Modification Outstanding Recorded Investment |  |  | 155,000
Mortgage loans, commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 2,385,000 | 2,410,000 |
Mortgage loans, commercial | Portfolio Segment |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  |  | $ 170,000
Number of Contracts | contract |  |  | 2
Pre-Modification Outstanding Recorded Investment |  |  | $ 183,000
Post- Modification Outstanding Recorded Investment |  |  | $ 183,000
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 73,000 | 82,000 |
Mortgage loans, multi-family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 0 |  |
Accruing |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 2,868,000 | 2,903,000 |
Accruing | Mortgage loans, land |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 0 |  |
Accruing | Commercial business loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  | 0 |
Accruing | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 483,000 | 493,000 |
Accruing | Mortgage loans, commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 2,385,000 | 2,410,000 |
Accruing | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 0 | 0 |
Accruing | Mortgage loans, multi-family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 0 |  |
Non- Accrual |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 203,000 | 366,000 |
Non- Accrual | Mortgage loans, land |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 130,000 |  |
Non- Accrual | Commercial business loans |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan |  | 143,000 |
Non- Accrual | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 0 | 141,000 |
Non- Accrual | Mortgage loans, commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 0 | 0 |
Non- Accrual | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | 73,000 | $ 82,000 |
Non- Accrual | Mortgage loans, multi-family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Troubled debt restructured loan | $ 0 |  |

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