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Loans Receivable And Allowance For Loan Losses - Amortized Cost of Collateral Dependent Loans (Details) - Collateral Pledged - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	$ 3,843	$ 3,885
Related ACL	308	506
One-to four-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	1,781	49
Related ACL	0	0
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	161	1,158
Related ACL	0	0
Home equity and second mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	575	618
Related ACL	0	0
Commercial business
Financing Receivable, Allowance for Credit Loss [Line Items]
Recorded Investment	1,326	2,060
Related ACL	$ 308	$ 506

X

- Definition

Financing Receivable, Individually Evaluated For Credit Loss, Recorded Investment

+ References

No definition available.

+ Details

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X

- Definition

Amount of allowance for credit loss on financing receivable evaluated on individual basis. Excludes financing receivable evaluated on collective basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.5.a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-4

Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 30
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479391/326-20-30-2

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X

- 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/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: 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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