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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | $ 1,021,373 |  | $ 1,033,725 |
Loans receivable, Non-Accrual | [1] | 2,029 |  | 2,905 |
Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 119,173 |  | 118,580 |
Loans receivable, Non-Accrual | [1] | 411 |  | 659 |
Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 94,756 |  | 85,053 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 458,889 |  | 453,574 |
Loans receivable, Non-Accrual | [1] | 373 |  | 858 |
Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 57,309 |  | 75,332 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction - speculative one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 9,263 |  | 7,108 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 37,007 |  | 20,927 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 22,397 |  | 10,832 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 1,151 |  | 4,739 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 18,289 |  | 25,571 |
Loans receivable, Non-Accrual | [1] | 169 |  | 394 |
Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 31,891 |  | 32,077 |
Loans receivable, Non-Accrual | [1] | 545 |  | 555 |
Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 2,725 |  | 3,572 |
Loans receivable, Non-Accrual | [1] | 18 |  | 9 |
Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 72,890 |  | 69,540 |
Loans receivable, Non-Accrual |  | 513 | [1] | 430 |
SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 95,633 |  | 126,820 |
Loans receivable, Non-Accrual |  | 0 |  | 0 | [1]
30 to 59 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 17 |  | 52 |
30 to 59 Days Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 17 |  | 0 |
30 to 59 Days Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 3 |
30 to 59 Days Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 49 |
30 to 59 Days Past Due | SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
60 to 89 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 896 |  | 791 |
60 to 89 Days Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 183 |  | 68 |
60 to 89 Days Past Due | Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
60 to 89 Days Past Due | Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 509 |  | 519 |
60 to 89 Days Past Due | Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
60 to 89 Days Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
60 to 89 Days Past Due | Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
60 to 89 Days Past Due | Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
60 to 89 Days Past Due | Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 38 |
60 to 89 Days Past Due | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 204 |  | 144 |
60 to 89 Days Past Due | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 22 |
60 to 89 Days Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
60 to 89 Days Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  |  |
60 to 89 Days Past Due | SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 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 | Mortgage loans, 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 | Mortgage loans, 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 | Mortgage loans, commercial |  |  |  |  |
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 | Mortgage loans, construction - custom and owner/builder |  |  |  |  |
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 | Mortgage loans, construction - speculative 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 | Mortgage loans, construction – commercial |  |  |  |  |
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 | Mortgage loans, construction - 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 | Mortgage loans, construction - Land development |  |  |  |  |
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 | Mortgage loans, 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 | Consumer loans, 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 loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Past Due 90 Days or More and Still Accruing |  | 0 |  |  |
Past Due 90 Days or More and Still Accruing | SBA PPP Loans |  |  |  |  |
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] |  |  |  |  |
Loans receivable, Total Past Due |  | 2,942 |  | 3,748 |
Financial Asset, Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 594 |  | 727 |
Financial Asset, Past Due | Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Financial Asset, Past Due | Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 882 |  | 1,377 |
Financial Asset, Past Due | Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Financial Asset, Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Financial Asset, Past Due | Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Financial Asset, Past Due | Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Financial Asset, Past Due | Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 38 |
Financial Asset, Past Due | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 373 |  | 538 |
Financial Asset, Past Due | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 562 |  | 577 |
Financial Asset, Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 18 |  | 12 |
Financial Asset, Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 513 |  | 479 |
Financial Asset, Past Due | SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Financial Asset, Not Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 1,018,431 |  | 1,029,977 |
Financial Asset, Not Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 118,579 |  | 117,853 |
Financial Asset, Not Past Due | Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 94,756 |  | 85,053 |
Financial Asset, Not Past Due | Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 458,007 |  | 452,197 |
Financial Asset, Not Past Due | Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 57,309 |  | 75,332 |
Financial Asset, Not Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 9,263 |  | 7,108 |
Financial Asset, Not Past Due | Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 37,007 |  | 20,927 |
Financial Asset, Not Past Due | Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 22,397 |  | 10,832 |
Financial Asset, Not Past Due | Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 1,151 |  | 4,701 |
Financial Asset, Not Past Due | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 17,916 |  | 25,033 |
Financial Asset, Not Past Due | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 31,329 |  | 31,500 |
Financial Asset, Not Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 2,707 |  | 3,560 |
Financial Asset, Not Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 72,377 |  | 69,061 |
Financial Asset, Not Past Due | SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | $ 95,633 |  | $ 126,820 |
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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