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Summary of Significant Accounting Policies: Cash (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Interest-bearing deposits in Federal Reserve Bank | $ 135,657 | $ 103,331
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 | $ 134,234 | $ 84,500

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