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Loans Receivable and Allowance for Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | $ 1,323,364
Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | $ 1,299,220 |
Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 17,758 |
Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 6,386 |
Mortgage loans, one-to-four family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 253,227
Mortgage loans, one-to-four family | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 252,859 |
Mortgage loans, one-to-four family | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, one-to-four family | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, one-to-four family | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 368 |
Mortgage loans, multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 127,176
Mortgage loans, multi-family | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 127,176 |
Mortgage loans, multi-family | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, multi-family | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, multi-family | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 568,265
Mortgage loans, commercial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 551,669 |
Mortgage loans, commercial | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 11,143 |
Mortgage loans, commercial | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, commercial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 5,453 |
Mortgage loans, construction - custom and owner/builder |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 73,239
Mortgage loans, construction - custom and owner/builder | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 68,181 |
Mortgage loans, construction - custom and owner/builder | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 5,058 |
Mortgage loans, construction - custom and owner/builder | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - custom and owner/builder | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - speculative one-to-four family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 9,361
Mortgage loans, construction - speculative one-to-four family | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 9,361 |
Mortgage loans, construction - speculative one-to-four family | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - speculative one-to-four family | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - speculative one-to-four family | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 26,030
Mortgage loans, construction - commercial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 25,063 |
Mortgage loans, construction - commercial | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 967 |
Mortgage loans, construction - commercial | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - commercial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 45,890
Mortgage loans, construction - multi-family | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 45,890 |
Mortgage loans, construction - multi-family | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - multi-family | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, construction - multi-family | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans - construction - land development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 16,129
Mortgage loans - construction - land development | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 16,129 |
Mortgage loans - construction - land development | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans - construction - land development | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans - construction - land development | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, land |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 26,726
Mortgage loans, land | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 26,226 |
Mortgage loans, land | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 500 |
Mortgage loans, land | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Mortgage loans, land | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Consumer loans, home equity and second mortgage |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 38,281
Consumer loans, home equity and second mortgage | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 37,982 |
Consumer loans, home equity and second mortgage | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 34 |
Consumer loans, home equity and second mortgage | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Consumer loans, home equity and second mortgage | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 265 |
Consumer loans, other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 2,772
Consumer loans, other | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 2,716 |
Consumer loans, other | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 56 |
Consumer loans, other | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Consumer loans, other | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Commercial business loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | 135,802
Commercial business loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 135,502 |
Commercial business loans | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Commercial business loans | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
Commercial business loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 300 |
SBA PPP Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable |  | $ 466
SBA PPP Loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 466 |
SBA PPP Loans | Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
SBA PPP Loans | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | 0 |
SBA PPP Loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans receivable | $ 0 |

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