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Fair Value Measurements: Fair Value Measurements, Nonrecurring, Valuation Techniques (Details) $ in Thousands | Jun. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
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Fair Value, Inputs, Level 3 | Valuation, Market Approach | Appraised value less estimated selling costs |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Individually evaluated collateral-dependent loans, measurement input | 0.08 | 0.08
Fair Value, Inputs, Level 3 | Valuation, Market Approach | Lower of appraised value or listing price less estimated selling costs |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
OREO and other repossessed assets, measurement input | 0.08 | 0.08
Nonrecurring |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, estimated fair value, nonrecurring | $ 744 | $ 1,315
Nonrecurring | Fair Value, Inputs, Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, estimated fair value, nonrecurring | $ 744 | $ 1,315

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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 -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-30 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-32 + Details
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