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Summary of Significant Accounting Policies: Cash (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Restricted Cash and Cash Equivalent Item [Line Items]
Interest-bearing deposits in Federal Reserve Bank	$ 219,779	$ 135,657
Minimum
Restricted Cash and Cash Equivalent Item [Line Items]
Maturity of CDs held for investment	12 months
Maximum
Restricted Cash and Cash Equivalent Item [Line Items]
Maturity of CDs held for investment	60 months
Interest-bearing deposits
Restricted Cash and Cash Equivalent Item [Line Items]
Interest-bearing deposits in Federal Reserve Bank	$ 211,756	$ 134,234

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- Definition

Maturity Of Certificates Of Deposit Held-for-investment

+ References

No definition available.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477263/942-210-45-4

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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/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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