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Investment Securities: Credit Loss by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	$ 55	$ 82	$ 60	$ 0
Provision for (Recapture of) Credit Losses	(5)	3	(10)	(7)
Ending Allowance	50	85	50	85
Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance				92
Private label residential
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	52	73	55	0
Provision for (Recapture of) Credit Losses	(4)	4	(7)	(5)
Ending Allowance	48	77	48	77
Private label residential | Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance				82
Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	3	9	5	0
Provision for (Recapture of) Credit Losses	(1)	(1)	(3)	(2)
Ending Allowance	$ 2	$ 8	$ 2	8
Bank issued trust preferred securities | Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance				$ 10

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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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- Definition

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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