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Loans Receivable and Allowance for Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | $ 1,150,450 |  | $ 987,066 |
Loans receivable, Non-Accrual | 2,059 | [1] | 2,854 | [2]
30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 37 |  | 5 |
60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 180 |
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 |
Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 2,096 |  | 3,039 |
Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 1,148,354 |  | 984,027 |
Mortgage loans, one-to-four family |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 176,116 |  | 119,935 |
Loans receivable, Non-Accrual | 388 | [1] | 407 | [2]
Mortgage loans, one-to-four family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, one-to-four family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 180 |
Mortgage loans, one-to-four family | 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 |
Mortgage loans, one-to-four family | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 388 |  | 587 |
Mortgage loans, one-to-four family | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 175,728 |  | 119,348 |
Mortgage loans, multi-family |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 95,025 |  | 87,563 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Mortgage loans, multi-family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, multi-family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, multi-family | 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 |
Mortgage loans, multi-family | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, multi-family | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 95,025 |  | 87,563 |
Mortgage loans, commercial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 536,650 |  | 470,650 |
Loans receivable, Non-Accrual | 657 | [1] | 773 | [2]
Mortgage loans, commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, commercial | 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 |
Mortgage loans, commercial | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 657 |  | 773 |
Mortgage loans, commercial | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 535,993 |  | 469,877 |
Mortgage loans, construction - custom and owner/builder |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 67,091 |  | 61,003 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Mortgage loans, construction - custom and owner/builder | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - custom and owner/builder | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - custom and owner/builder | 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 |
Mortgage loans, construction - custom and owner/builder | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - custom and owner/builder | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 67,091 |  | 61,003 |
Mortgage loans, construction - speculative one-to-four family |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 8,364 |  | 9,657 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Mortgage loans, construction - speculative one-to-four family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - speculative one-to-four family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - speculative one-to-four family | 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 |
Mortgage loans, construction - speculative one-to-four family | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - speculative one-to-four family | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 8,364 |  | 9,657 |
Mortgage loans, construction - commercial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 29,059 |  | 38,931 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Mortgage loans, construction - commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - commercial | 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 |
Mortgage loans, construction - commercial | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - commercial | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 29,059 |  | 38,931 |
Mortgage loans, construction - multi-family |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 34,354 |  | 22,888 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Mortgage loans, construction - multi-family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - multi-family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - multi-family | 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 |
Mortgage loans, construction - multi-family | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - multi-family | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 34,354 |  | 22,888 |
Mortgage loans - construction - land development |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 13,582 |  | 5,502 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Mortgage loans - construction - land development | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans - construction - land development | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans - construction - land development | 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 |
Mortgage loans - construction - land development | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans - construction - land development | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 13,582 |  | 5,502 |
Mortgage loans, land |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 26,854 |  | 19,936 |
Loans receivable, Non-Accrual | 450 | [1] | 683 | [2]
Mortgage loans, land | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, land | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, land | 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 |
Mortgage loans, land | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 450 |  | 683 |
Mortgage loans, land | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 26,404 |  | 19,253 |
Consumer loans, home equity and second mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 35,187 |  | 32,988 |
Loans receivable, Non-Accrual | 252 | [1] | 516 | [2]
Consumer loans, home equity and second mortgage | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 37 |  | 0 |
Consumer loans, home equity and second mortgage | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Consumer loans, home equity and second mortgage | 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 |
Consumer loans, home equity and second mortgage | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 289 |  | 516 |
Consumer loans, home equity and second mortgage | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 34,898 |  | 32,472 |
Consumer loans, other |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 2,128 |  | 2,512 |
Loans receivable, Non-Accrual | 3 | [1] | 17 | [2]
Consumer loans, other | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Consumer loans, other | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Consumer loans, other | 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 |
Consumer loans, other | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 3 |  | 17 |
Consumer loans, other | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 2,125 |  | 2,495 |
Commercial business loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 125,039 |  | 74,579 |
Loans receivable, Non-Accrual | 309 | [1] | 458 | [2]
Commercial business loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 5 |
Commercial business loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Commercial business loans | 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 |
Commercial business loans | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 309 |  | 463 |
Commercial business loans | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 124,730 |  | 74,116 |
SBA PPP Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 1,001 |  | 40,922 |
Loans receivable, Non-Accrual | 0 |  | 0 |
SBA PPP Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
SBA PPP Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
SBA PPP Loans | 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 |
SBA PPP Loans | Financial Asset, Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
SBA PPP Loans | Financial Asset, Not Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | $ 1,001 |  | $ 40,922 |
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.
[2] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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