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Loans Receivable And Allowance For Loan Losses - Amortized Cost of Collateral Dependent Loans (Details) - Collateral Pledged - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | $ 2,327 | $ 3,885
Related ACL | 423 | 506
One-to four-family |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 47 | 49
Related ACL | 0 | 0
Commercial real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 324 | 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 | 1,381 | 2,060
Related ACL | $ 423 | $ 506

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- Definition Financing Receivable, Individually Evaluated For Credit Loss, Recorded Investment + References No definition available. + Details
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- 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 + Details
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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/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 + Details
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