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Investment Securities: Credit Loan By Portfolio Segment (Details) - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	$ 60,000	$ 0
Provision for (Recapture of ) Credit Losses	(24,000)	(32,000)
Ending Allowance	36,000	60,000
Impact of Adopting CECL (ASU 2016-13)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance		92,000
Private label residential
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	55,000	0
Provision for (Recapture of ) Credit Losses	(20,000)	(27,000)
Ending Allowance	35,000	55,000
Private label residential | Impact of Adopting CECL (ASU 2016-13)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance		82,000
Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	5,000	0
Provision for (Recapture of ) Credit Losses	(4,000)	(5,000)
Ending Allowance	$ 1,000	5,000
Bank issued trust preferred securities | Impact of Adopting CECL (ASU 2016-13)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance		$ 10,000

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- Definition

Debt Securities, Held-to-Maturity, Excluding Accrued Interest, Provision for (Recapture of) Credit Losses

+ References

No definition available.

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- Definition

Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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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