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Loans Receivable and Allowance for Loan Losses: Narrative (Details)	12 Months Ended
	Sep. 30, 2025 USD ($) loan	Sep. 30, 2024 USD ($) loan	Sep. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loans to appraisal or purchase price (as a percent)	85.00%
Number of loans classified as doubtful | loan	1	1
ACL on loans increase	$ 613,000	$ 1,661,000
Provision for credit losses - loans	853,000	1,254,000	$ 2,132,000
Net charge-offs	240,000	461,000
Nonaccrual loans	1,312,000	1,825,000
Non-accrual loans, ACL	360,000	506,000
Non-accrual loans with no ACL	$ 3,095,000	2,060,000
Mortgage loans, one-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loans to appraisal or purchase price (as a percent)	85.00%
Provision for credit losses - loans	$ 260,000	580,000	759,000
Ratio of loans to appraised value, private mortgage insurance requirement, percentage limit	80.00%
Mortgage loans, commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loans to appraisal or purchase price (as a percent)	80.00%
Mortgage loans, land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ratio of loans to appraisal or purchase price (as a percent)	65.00%
Provision for credit losses - loans	$ 4,000	$ 69,000	$ 9,000

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 16
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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