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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
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Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | $ 1,434,551 |  | $ 1,444,426 |
Loans receivable, Non-Accrual | [1] | 2,733 |  | 3,885 |
One-to four-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 306,443 |  | 299,123 |
Loans receivable, Non-Accrual | [1] | 47 |  | 49 |
Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 177,861 |  | 177,350 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Commercial real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 597,054 |  | 599,219 |
Loans receivable, Non-Accrual | [1] | 698 |  | 1,158 |
Construction-custom & owner/builder (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 77,679 |  | 81,274 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Construction-speculative one-to four-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 4,769 |  | 7,451 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Construction-commercial (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 14,499 |  | 23,812 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Construction-multi-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 24,013 |  | 20,757 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Construction-land development (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 14,439 |  | 16,029 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 30,538 |  | 29,366 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 48,851 |  | 47,913 |
Loans receivable, Non-Accrual | [1] | 587 |  | 618 |
Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 2,889 |  | 3,129 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Commercial business |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 135,312 |  | 138,743 |
Loans receivable, Non-Accrual |  | 1,401 | [1] | 2,060 |
SBA PPP |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 204 |  | 260 |
Loans receivable, Non-Accrual |  | 0 |  | 0 | [1]
30 to 59 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 541 |  | 424 |
30 to 59 Days Past Due | One-to four-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Commercial real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Construction-custom & owner/builder (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Construction-speculative one-to four-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Construction-commercial (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Construction-multi-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Construction-land development (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
30 to 59 Days Past Due | Commercial business |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 541 |  | 424 |
30 to 59 Days Past Due | SBA PPP |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 746 |  | 170 |
60 to 89 Days Past Due | One-to four-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 62 |  | 0 |
60 to 89 Days Past Due | Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due | Commercial real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 436 |  | 0 |
60 to 89 Days Past Due | Construction-custom & owner/builder (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due | Construction-speculative one-to four-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due | Construction-commercial (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due | Construction-multi-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due | Construction-land development (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due | Land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due | Home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
60 to 89 Days Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 1 |
60 to 89 Days Past Due | Commercial business |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 248 |  | 169 |
60 to 89 Days Past Due | SBA PPP |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
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 |
Past Due 90 Days or More and Still Accruing | One-to four-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Commercial real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Construction-custom & owner/builder (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Construction-speculative one-to four-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Construction-commercial (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Construction-multi-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Construction-land development (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Commercial business |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | SBA PPP |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  | 0 |
Financial Asset, Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 4,020 |  | 4,479 |
Financial Asset, Past Due | One-to four-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 109 |  | 49 |
Financial Asset, Past Due | Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
Financial Asset, Past Due | Commercial real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 1,134 |  | 1,158 |
Financial Asset, Past Due | Construction-custom & owner/builder (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
Financial Asset, Past Due | Construction-speculative one-to four-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
Financial Asset, Past Due | Construction-commercial (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
Financial Asset, Past Due | Construction-multi-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
Financial Asset, Past Due | Construction-land development (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
Financial Asset, Past Due | Land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
Financial Asset, Past Due | Home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 587 |  | 618 |
Financial Asset, Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 1 |
Financial Asset, Past Due | Commercial business |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 2,190 |  | 2,653 |
Financial Asset, Past Due | SBA PPP |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 0 |  | 0 |
Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 1,430,531 |  | 1,439,947 |
Financial Asset, Not Past Due | One-to four-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 306,334 |  | 299,074 |
Financial Asset, Not Past Due | Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 177,861 |  | 177,350 |
Financial Asset, Not Past Due | Commercial real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 595,920 |  | 598,061 |
Financial Asset, Not Past Due | Construction-custom & owner/builder (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 77,679 |  | 81,274 |
Financial Asset, Not Past Due | Construction-speculative one-to four-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 4,769 |  | 7,451 |
Financial Asset, Not Past Due | Construction-commercial (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 14,499 |  | 23,812 |
Financial Asset, Not Past Due | Construction-multi-family (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 24,013 |  | 20,757 |
Financial Asset, Not Past Due | Construction-land development (1) |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 14,439 |  | 16,029 |
Financial Asset, Not Past Due | Land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 30,538 |  | 29,366 |
Financial Asset, Not Past Due | Home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 48,264 |  | 47,295 |
Financial Asset, Not Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 2,889 |  | 3,128 |
Financial Asset, Not Past Due | Commercial business |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | 133,122 |  | 136,090 |
Financial Asset, Not Past Due | SBA PPP |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Total Loans Receivable |  | $ 204 |  | $ 260 |
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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