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Loans Receivable and Allowance for Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans receivable | $ 1,575,498,000 | $ 1,514,304,000 |  |
Undisbursed portion of construction loans in process | 88,289,000 | 69,878,000 |  |
Deferred loan origination fees | 5,528,000 | 5,425,000 |  |
Allowance for credit losses | 18,091,000 | 17,478,000 | $ 15,817,000 | $ 13,703,000
Less: Loans in process, Deferred fees and Allowance for loan losses | 111,908,000 | 92,781,000 |  |
Total loans receivable, net | 1,463,590,000 | 1,421,523,000 |  |
Unamortized discounts, loans receivable | 51,000 | 155,000 |  |
Total mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 1,395,990,000 | 1,324,259,000 |  |
Mortgage loans, one-to-four family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 317,691,000 | 299,123,000 |  |
Allowance for credit losses | 2,892,000 | 2,632,000 | 2,417,000 | 1,658,000
Mortgage loans, multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 207,767,000 | 177,350,000 |  |
Allowance for credit losses | 1,625,000 | 1,308,000 | 1,156,000 | 855,000
Mortgage loans, commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 610,692,000 | 599,219,000 |  |
Allowance for credit losses | 7,147,000 | 6,934,000 | 7,209,000 | 6,682,000
Mortgage loans, construction - custom and owner/builder |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 130,341,000 | 132,101,000 |  |
Allowance for credit losses | 1,268,000 | 1,328,000 | 750,000 | 675,000
Mortgage loans, construction - speculative one-to-four family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 10,745,000 | 11,495,000 |  |
Allowance for credit losses | 112,000 | 128,000 | 148,000 | 130,000
Mortgage loans, construction - commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 21,818,000 | 29,463,000 |  |
Allowance for credit losses | 348,000 | 537,000 | 316,000 | 343,000
Mortgage loans, construction - multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 45,660,000 | 28,401,000 |  |
Allowance for credit losses | 400,000 | 456,000 | 602,000 | 447,000
Mortgage loans - construction - land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 15,324,000 | 17,741,000 |  |
Allowance for credit losses | 412,000 | 335,000 | 274,000 | 233,000
Mortgage loans, land |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans | 35,952,000 | 29,366,000 |  |
Allowance for credit losses | 797,000 | 793,000 | 406,000 | 397,000
Total consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Consumer loans | 52,513,000 | 51,042,000 |  |
Consumer loans, home equity and second mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Consumer loans | 50,479,000 | 47,913,000 |  |
Allowance for credit losses | 435,000 | 348,000 | 519,000 | 440,000
Consumer loans, other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Consumer loans | 2,034,000 | 3,129,000 |  |
Allowance for credit losses | 58,000 | 39,000 | 53,000 | 42,000
Commercial business loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
SBA Paycheck Protection Program ("PPP") | 126,937,000 | 138,743,000 |  |
Allowance for credit losses | 2,597,000 | 2,640,000 | $ 1,967,000 | $ 1,801,000
SBA PPP |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
SBA Paycheck Protection Program ("PPP") | 58,000 | 260,000 |  |
Commercial And PPP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
SBA Paycheck Protection Program ("PPP") | $ 126,995,000 | $ 139,003,000 |  |

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