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Loans Receivable and Allowance for Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | $ 1,444,426 | $ 1,323,364
Non-accrual loans | 3,885 | 1,514
30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 424 | 151
60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 170 | 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
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 4,479 | 1,665
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 1,439,947 | 1,321,699
Mortgage loans, one-to-four family |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 299,123 | 253,227
Non-accrual loans | 49 | 368
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 | 0
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 49 | 368
Mortgage loans, one-to-four family | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 299,074 | 252,859
Mortgage loans, multi-family |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 177,350 | 127,176
Non-accrual loans | 0 | 0
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 0
Mortgage loans, multi-family | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 177,350 | 127,176
Mortgage loans, commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 599,219 | 568,265
Non-accrual loans | 1,158 | 683
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 1,158 | 683
Mortgage loans, commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 598,061 | 567,582
Mortgage loans, construction - custom and owner/builder |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 81,274 | 73,239
Non-accrual loans | 0 | 0
Mortgage loans, construction - custom and owner/builder | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 151
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 151
Mortgage loans, construction - custom and owner/builder | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 81,274 | 73,088
Mortgage loans, construction - speculative one-to-four family |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 7,451 | 9,361
Non-accrual loans | 0 | 0
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 0
Mortgage loans, construction - speculative one-to-four family | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 7,451 | 9,361
Mortgage loans, construction - commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 23,812 | 26,030
Non-accrual loans | 0 | 0
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 0
Mortgage loans, construction - commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 23,812 | 26,030
Mortgage loans, construction - multi-family |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 20,757 | 45,890
Non-accrual loans | 0 | 0
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 0
Mortgage loans, construction - multi-family | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 20,757 | 45,890
Mortgage loans - construction - land development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 16,029 | 16,129
Non-accrual loans | 0 | 0
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 0
Mortgage loans - construction - land development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 16,029 | 16,129
Mortgage loans, land |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 29,366 | 26,726
Non-accrual loans | 0 | 0
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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 0
Mortgage loans, land | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 29,366 | 26,726
Consumer loans, home equity and second mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 47,913 | 38,281
Non-accrual loans | 618 | 177
Consumer loans, home equity and second mortgage | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 618 | 177
Consumer loans, home equity and second mortgage | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 47,295 | 38,104
Consumer loans, other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 3,129 | 2,772
Non-accrual loans | 0 | 0
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 | 1 | 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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 1 | 0
Consumer loans, other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 3,128 | 2,772
Commercial business loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 138,743 | 135,802
Non-accrual loans | 2,060 | 286
Commercial business loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 424 | 0
Commercial business loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 169 | 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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 2,653 | 286
Commercial business loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 136,090 | 135,516
SBA PPP Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 260 | 466
Non-accrual loans | 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 | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | 0 | 0
SBA PPP Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable, Total Past Due | $ 260 | $ 466

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