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Fair Value Measurements: Balances of assets and liabilities measured at estimated fair value on a recurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | $ 70,141 | $ 58,884
MBS: U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 69,184 | 57,907
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 957 | 977
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 69,184 | 57,907
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 0 | 0
Recurring | MBS: U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 69,184 | 57,907
Recurring | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 957 | 977
Recurring | Fair Value, Inputs, Level 1 | MBS: U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 0 | 0
Recurring | Fair Value, Inputs, Level 1 | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 957 | 977
Recurring | Fair Value, Inputs, Level 2 | MBS: U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 69,184 | 57,907
Recurring | Fair Value, Inputs, Level 2 | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 0 | 0
Recurring | Fair Value, Inputs, Level 3 | MBS: U.S. government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | 0 | 0
Recurring | Fair Value, Inputs, Level 3 | Mutual funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale investment securities, estimated fair value | $ 0 | $ 0

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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