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Loans Receivable and Allowance for Loan Losses Loans Receivable and Allowance for Loan Losses: Schedule of Troubled Debt Restructured Loans (Details) | 12 Months Ended
--- | ---
Sep. 30, 2017 USD ($) contract | Sep. 30, 2016 USD ($) contract | Sep. 30, 2015 USD ($) contract
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | $ 3,595,000 | $ 8,160,000 |
Troubled debt restructured loan, subsequent default, number of contracts | contract | 0 | 0 | 0
Troubled debt restructured loan, subsequent default, recorded investment | $ 0 | $ 0 | $ 0
Portfolio Segment |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan |  | $ 48,000 |
Number of Contracts | contract |  | 1 |
Pre-Modification Outstanding Recorded Investment |  | $ 48,000 |
Post- Modification Outstanding Recorded Investment |  | 48,000 |
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 569,000 | 1,476,000 |
Mortgage loans, one-to-four family | Portfolio Segment |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan |  | $ 48,000 |
Number of Contracts | contract |  | 1 |
Pre-Modification Outstanding Recorded Investment |  | $ 48,000 |
Post- Modification Outstanding Recorded Investment |  | 48,000 |
Mortgage loans, commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 2,219,000 | 5,268,000 |
Mortgage loans, land |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 807,000 | 973,000 |
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan |  | 443,000 |
Accruing |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 3,342,000 | 7,629,000 |
Accruing | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 569,000 | 1,350,000 |
Accruing | Mortgage loans, commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 2,219,000 | 5,268,000 |
Accruing | Mortgage loans, land |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 554,000 | 720,000 |
Accruing | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan |  | 291,000 |
Non- Accrual |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 253,000 | 531,000 |
Non- Accrual | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 0 | 126,000 |
Non- Accrual | Mortgage loans, commercial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | 0 | 0 |
Non- Accrual | Mortgage loans, land |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan | $ 253,000 | 253,000 |
Non- Accrual | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Troubled debt restructured loan |  | $ 152,000 |

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