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Summary of Significant Accounting Policies: Cash (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Interest-bearing deposits in Federal Reserve Bank | $ 103,331 | $ 291,947
Minimum |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Maturity of CDs held for investment | 12 months |
Maximum |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Maturity of CDs held for investment | 60 months |
Interest-bearing deposits |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Interest-bearing deposits in Federal Reserve Bank | $ 84,500 | $ 215,637

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- Definition 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 -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481309/942-210-45-4 + Details
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