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Investment Securities: Narrative-Realized Gains (Losses) (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($) security	Sep. 30, 2020 USD ($)
Investments [Abstract]
Loss on sale of securities	$ 5	$ 65
Held-to-maturity securities, realized loss, number of securities | security	12	9
Security owned and pledged as collateral	$ 98,620		$ 81,030

X

- Definition

Held-to-Maturity Securities, Gross Realized Loss, Number of Securities

+ References

No definition available.

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- Definition

Marketable Securities, Realized Loss

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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

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