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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
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Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | $ 3,928 |  | $ 3,748 |
Loans receivable, Non-Accrual | [1] | 2,305 |  | 2,905 |
Loans receivable, Current |  | 1,047,188 |  | 1,029,977 |
Loans receivable |  | 1,051,116 |  | 1,033,725 |
Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 415 |  | 727 |
Loans receivable, Non-Accrual | [1] | 415 |  | 659 |
Loans receivable, Current |  | 116,769 |  | 117,853 |
Loans receivable |  | 117,184 |  | 118,580 |
Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Loans receivable, Current |  | 92,435 |  | 85,053 |
Loans receivable |  | 92,435 |  | 85,053 |
Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 1,157 |  | 1,377 |
Loans receivable, Non-Accrual | [1] | 643 |  | 858 |
Loans receivable, Current |  | 460,809 |  | 452,197 |
Loans receivable |  | 461,966 |  | 453,574 |
Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 808 |  | 0 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Loans receivable, Current |  | 62,165 |  | 75,332 |
Loans receivable |  | 62,973 |  | 75,332 |
Mortgage loans, construction - speculative one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Loans receivable, Current |  | 7,336 |  | 7,108 |
Loans receivable |  | 7,336 |  | 7,108 |
Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Loans receivable, Current |  | 34,217 |  | 20,927 |
Loans receivable |  | 34,217 |  | 20,927 |
Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Loans receivable, Current |  | 15,739 |  | 10,832 |
Loans receivable |  | 15,739 |  | 10,832 |
Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 38 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Loans receivable, Current |  | 623 |  | 4,701 |
Loans receivable |  | 623 |  | 4,739 |
Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 390 |  | 538 |
Loans receivable, Non-Accrual | [1] | 173 |  | 394 |
Loans receivable, Current |  | 18,651 |  | 25,033 |
Loans receivable |  | 19,041 |  | 25,571 |
Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 612 |  | 577 |
Loans receivable, Non-Accrual | [1] | 539 |  | 555 |
Loans receivable, Current |  | 31,414 |  | 31,500 |
Loans receivable |  | 32,026 |  | 32,077 |
Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 19 |  | 12 |
Loans receivable, Non-Accrual | [1] | 8 |  | 9 |
Loans receivable, Current |  | 2,737 |  | 3,560 |
Loans receivable |  | 2,756 |  | 3,572 |
Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 527 |  | 479 |
Loans receivable, Non-Accrual |  | 527 | [1] | 430 |
Loans receivable, Current |  | 66,118 |  | 69,061 |
Loans receivable |  | 66,645 |  | 69,540 |
SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Loans receivable, Non-Accrual |  | 0 |  | 0 | [1]
Loans receivable, Current |  | 138,175 |  | 126,820 |
Loans receivable |  | 138,175 |  | 126,820 |
30 to 59 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 1,550 |  | 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 |  | 514 |  | 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 |  | 808 |  | 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 |  | 217 |  | 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 |  | 0 |  | 0 |
30 to 59 Days Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 11 |  | 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 |  | 73 |  | 791 |
60 to 89 Days Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 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 |  | 0 |  | 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 |  | 0 |  | 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 |  | 73 |  | 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] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 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] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 0 |
Past Due 90 Days or More and Still Accruing | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  |  |
Past Due 90 Days or More and Still Accruing | SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | $ 0 |  | $ 0 |
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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