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Investment Securities: Narrative-Realized Gains (Losses) (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) security | Sep. 30, 2020 USD ($) security
Investments [Abstract] |  |  |
Loss on sale of securities | $ 1 | $ 12 | $ 66
Held-to-maturity securities, realized loss, number of securities | security |  | 19 | 19
Security owned and pledged as collateral | $ 133,824 | $ 97,602 |

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- Definition Marketable Securities, Realized Loss + References No definition available. + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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