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Fair Value Measurements: Fair Value Measurements, Nonrecurring, Valuation Techniques (Details) - Nonrecurring - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
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Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, estimated fair value, nonrecurring | $ 122 | $ 123
Impaired loans | Market Approach Valuation Technique |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |
Assets, estimated fair value, nonrecurring | $ 122 | $ 123

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