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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
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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Amount of undisbursed portion of financing receivable balance. Excludes financing receivable covered under loss sharing agreement.

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