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Investment Securities: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |  |
Balance, beginning of year | $ 816 | $ 836 | $ 853
Net realized gain (losses) previously recorded as credit losses | (2) | (11) | 1
Recovery of prior credit loss | (11) | (9) | (18)
Balance, end of year | $ 803 | $ 816 | $ 836

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- Definition Other Than Temporary Impairment, Credit Losses Recognized In Earnings, Net Realized Gain (Loss) + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of accumulated credit loss recognized in earnings for debt security held for which portion of other-than-temporary impairment (OTTI) was recognized in other comprehensive income (OCI). + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-8B Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-8B + Details
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Period Type: | instant

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- Definition Amount of decrease in accumulated credit loss recognized in earnings for other-than-temporary impairment (OTTI) of debt security held from increase in cash flow expected to be collected and recognized over remaining life of security. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8B -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-8B + Details
Name: | us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCashFlows
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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