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Investment Securities: Credit Loss by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2024
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	$ 85	$ 0
Provision for (Recapture of) Credit Losses	(13)	(20)
Ending Allowance	72	72
Impact of Adopting CECL (ASU 2016-13)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	0	92
Private label residential
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	77	0
Provision for (Recapture of) Credit Losses	(11)	(16)
Ending Allowance	66	66
Private label residential | Impact of Adopting CECL (ASU 2016-13)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	0	82
Bank issued trust preferred securities
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	8	0
Provision for (Recapture of) Credit Losses	(2)	(4)
Ending Allowance	6	6
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	$ 0	$ 10

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- Definition

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

+ References

No definition available.

+ Details

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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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