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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
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Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | $ 1,280,911 |  | $ 1,150,450 |
Loans receivable, Non-Accrual | [1] | 1,586 |  | 2,059 |
Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 229,274 |  | 176,116 |
Loans receivable, Non-Accrual | [1] | 373 |  | 388 |
Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 111,777 |  | 95,025 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 557,015 |  | 536,650 |
Loans receivable, Non-Accrual | [1] | 686 |  | 657 |
Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 78,739 |  | 67,091 |
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 |  | 7,037 |  | 8,364 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 24,300 |  | 29,059 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 52,941 |  | 34,354 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 13,810 |  | 13,582 |
Loans receivable, Non-Accrual | [1] | 0 |  | 0 |
Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 25,908 |  | 26,854 |
Loans receivable, Non-Accrual | [1] | 54 |  | 450 |
Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 40,008 |  | 35,187 |
Loans receivable, Non-Accrual | [1] | 184 |  | 252 |
Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 2,469 |  | 2,128 |
Loans receivable, Non-Accrual | [1] | 0 |  | 3 |
Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 137,114 |  | 125,039 |
Loans receivable, Non-Accrual |  | 289 | [1] | 309 |
SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 519 |  | 1,001 |
Loans receivable, Non-Accrual |  | 0 |  | 0 | [1]
30 to 59 Days Past Due |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 71 |  | 37 |
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 |  | 49 |  | 37 |
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 |  | 22 |  | 0 |
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 |  | 186 |  | 0 |
60 to 89 Days Past Due | Mortgage loans, 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, 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 |  | 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 |  | 186 |  | 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 |  | 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 |  | 1,843 |  | 2,096 |
Financial Asset, Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 373 |  | 388 |
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 |  | 686 |  | 657 |
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 |  | 54 |  | 450 |
Financial Asset, Past Due | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 233 |  | 289 |
Financial Asset, Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 0 |  | 3 |
Financial Asset, Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 497 |  | 309 |
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 |  | 1,279,068 |  | 1,148,354 |
Financial Asset, Not Past Due | Mortgage loans, one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 228,901 |  | 175,728 |
Financial Asset, Not Past Due | Mortgage loans, multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 111,777 |  | 95,025 |
Financial Asset, Not Past Due | Mortgage loans, commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 556,329 |  | 535,993 |
Financial Asset, Not Past Due | Mortgage loans, construction - custom and owner/builder |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 78,739 |  | 67,091 |
Financial Asset, Not Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 7,037 |  | 8,364 |
Financial Asset, Not Past Due | Mortgage loans, construction – commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 24,300 |  | 29,059 |
Financial Asset, Not Past Due | Mortgage loans, construction - Multi-family |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 52,941 |  | 34,354 |
Financial Asset, Not Past Due | Mortgage loans, construction - Land development |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 13,810 |  | 13,582 |
Financial Asset, Not Past Due | Mortgage loans, land |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 25,854 |  | 26,404 |
Financial Asset, Not Past Due | Consumer loans, home equity and second mortgage |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 39,775 |  | 34,898 |
Financial Asset, Not Past Due | Consumer loans, other |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 2,469 |  | 2,125 |
Financial Asset, Not Past Due | Commercial business loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | 136,617 |  | 124,730 |
Financial Asset, Not Past Due | SBA PPP Loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans receivable, Total Past Due |  | $ 519 |  | $ 1,001 |
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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