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Investment Securities: Credit Loss by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Line Items]
Beginning Allowance	$ 0
Provision for (Recapture of) Credit Losses	(10)	$ 0
Ending Allowance	82
Impact of Adopting CECL (ASU 2016-13)
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	0
Provision for (Recapture of) Credit Losses	(9)
Ending Allowance	73
Private label residential | Impact of Adopting CECL (ASU 2016-13)
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	0
Provision for (Recapture of) Credit Losses	(1)
Ending Allowance	9
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

X

- 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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X

- Definition

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

+ 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

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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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