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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
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Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | $ 1,051,314 |  | $ 987,066 |
Loans receivable, Non-Accrual | [1] | 2,651 |  | 2,854 |
Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 133,925 |  | 119,935 |
Loans receivable, Non-Accrual | [1] | 578 |  | 407 |
Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 82,526 |  | 87,563 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 523,479 |  | 470,650 |
Loans receivable, Non-Accrual | [1] | 671 |  | 773 |
Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 68,530 |  | 61,003 |
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 |  | 7,634 |  | 9,657 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 28,005 |  | 38,931 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 29,048 |  | 22,888 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 6,140 |  | 5,502 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 22,192 |  | 19,936 |
Loans receivable, Non-Accrual | [1] | 723 |  | 683 |
Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 32,980 |  | 32,988 |
Loans receivable, Non-Accrual | [1] | 269 |  | 516 |
Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 2,277 |  | 2,512 |
Loans receivable, Non-Accrual | [1] | 5 |  | 17 |
Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 108,644 |  | 74,579 |
Loans receivable, Non-Accrual |  | 405 | [1] | 458 |
SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 5,934 |  | 40,922 |
Loans receivable, Non-Accrual |  | 0 |  | 0 | [1]
30 to 59 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 282 |  | 5 |
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 |  | 215 |  | 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 |  | 67 |  | 0 |
30 to 59 Days Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
30 to 59 Days Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 5 |
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 |  | 8 |  | 180 |
60 to 89 Days Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 180 |
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 |  | 8 |  | 0 |
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 |  | 0 |
60 to 89 Days Past Due | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
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 |  | 0 |
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 |  | 2,941 |  | 3,039 |
Financial Asset, Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 578 |  | 587 |
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 |  | 894 |  | 773 |
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 |  | 0 |
Financial Asset, Past Due | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 723 |  | 683 |
Financial Asset, Past Due | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 336 |  | 516 |
Financial Asset, Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 5 |  | 17 |
Financial Asset, Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 405 |  | 463 |
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 |  | 1,048,373 |  | 984,027 |
Financial Asset, Not Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 133,347 |  | 119,348 |
Financial Asset, Not Past Due | Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 82,526 |  | 87,563 |
Financial Asset, Not Past Due | Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 522,585 |  | 469,877 |
Financial Asset, Not Past Due | Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 68,530 |  | 61,003 |
Financial Asset, Not Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 7,634 |  | 9,657 |
Financial Asset, Not Past Due | Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 28,005 |  | 38,931 |
Financial Asset, Not Past Due | Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 29,048 |  | 22,888 |
Financial Asset, Not Past Due | Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 6,140 |  | 5,502 |
Financial Asset, Not Past Due | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 21,469 |  | 19,253 |
Financial Asset, Not Past Due | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 32,644 |  | 32,472 |
Financial Asset, Not Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 2,272 |  | 2,495 |
Financial Asset, Not Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 108,239 |  | 74,116 |
Financial Asset, Not Past Due | SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | $ 5,934 |  | $ 40,922 |
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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