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Loans Receivable and Allowance for Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
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Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | $ 1,487,209 | $ 1,444,426 |
Non-accrual loans | 4,407 | 3,885 |
Recorded Investment |  |  | $ 4,009
30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 374 | 424 |
60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 876 | 170 |
Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 5,657 | 4,479 |
Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 1,481,552 | 1,439,947 |
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 317,691 | 299,123 |
Non-accrual loans | 1,781 | 49 |
Recorded Investment |  |  | 368
Mortgage loans, one-to-four family | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, one-to-four family | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 210 | 0 |
Mortgage loans, one-to-four family | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans, one-to-four family | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 1,991 | 49 |
Mortgage loans, one-to-four family | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 315,700 | 299,074 |
Mortgage loans, multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 207,767 | 177,350 |
Non-accrual loans | 0 | 0 |
Mortgage loans, multi-family | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, multi-family | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, multi-family | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans, multi-family | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, multi-family | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 207,767 | 177,350 |
Mortgage loans, commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 610,692 | 599,219 |
Non-accrual loans | 159 | 1,158 |
Recorded Investment |  |  | 2,973
Mortgage loans, commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 255 | 0 |
Mortgage loans, commercial | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans, commercial | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 414 | 1,158 |
Mortgage loans, commercial | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 610,278 | 598,061 |
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 80,718 | 81,274 |
Non-accrual loans | 553 | 0 |
Mortgage loans, construction - custom and owner/builder | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - custom and owner/builder | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - custom and owner/builder | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans, construction - custom and owner/builder | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 553 | 0 |
Mortgage loans, construction - custom and owner/builder | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 80,165 | 81,274 |
Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 6,923 | 7,451 |
Non-accrual loans | 0 | 0 |
Mortgage loans, construction - speculative one-to-four family | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - speculative one-to-four family | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - speculative one-to-four family | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans, construction - speculative one-to-four family | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - speculative one-to-four family | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 6,923 | 7,451 |
Mortgage loans, construction - commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 15,734 | 23,812 |
Non-accrual loans | 0 | 0 |
Mortgage loans, construction - commercial | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - commercial | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - commercial | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans, construction - commercial | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - commercial | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 15,734 | 23,812 |
Mortgage loans, construction - multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 18,688 | 20,757 |
Non-accrual loans | 0 | 0 |
Mortgage loans, construction - multi-family | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - multi-family | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - multi-family | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans, construction - multi-family | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, construction - multi-family | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 18,688 | 20,757 |
Mortgage loans - construction - land development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 13,536 | 16,029 |
Non-accrual loans | 0 | 0 |
Mortgage loans - construction - land development | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans - construction - land development | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans - construction - land development | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans - construction - land development | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans - construction - land development | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 13,536 | 16,029 |
Mortgage loans, land |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 35,952 | 29,366 |
Non-accrual loans | 0 | 0 |
Recorded Investment |  |  | 0
Mortgage loans, land | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, land | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, land | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Mortgage loans, land | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Mortgage loans, land | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 35,952 | 29,366 |
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 50,479 | 47,913 |
Non-accrual loans | 602 | 618 |
Recorded Investment |  |  | 382
Consumer loans, home equity and second mortgage | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Consumer loans, home equity and second mortgage | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 411 | 0 |
Consumer loans, home equity and second mortgage | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Consumer loans, home equity and second mortgage | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 1,013 | 618 |
Consumer loans, home equity and second mortgage | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 49,466 | 47,295 |
Consumer loans, other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 2,034 | 3,129 |
Non-accrual loans | 22 | 0 |
Recorded Investment |  |  | 0
Consumer loans, other | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
Consumer loans, other | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 1 |
Consumer loans, other | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Consumer loans, other | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 22 | 1 |
Consumer loans, other | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 2,012 | 3,128 |
Commercial business loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 126,937 | 138,743 |
Non-accrual loans | 1,290 | 2,060 |
Recorded Investment |  |  | $ 286
Commercial business loans | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 374 | 424 |
Commercial business loans | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 169 |
Commercial business loans | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
Commercial business loans | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 1,664 | 2,653 |
Commercial business loans | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 125,273 | 136,090 |
SBA PPP Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 58 | 260 |
Non-accrual loans | 0 | 0 |
SBA PPP Loans | 30-59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
SBA PPP Loans | 60-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
SBA PPP Loans | Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Past Due 90 Days or More and Still Accruing | 0 | 0 |
SBA PPP Loans | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | 0 | 0 |
SBA PPP Loans | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due | $ 58 | $ 260 |

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