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Loans Receivable And Allowance For Loan Losses - Amortized Cost of Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | $ 4,009 | $ 4,532
Related Allowance | 123 | 127
Collateral Pledged |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 3,885 |
Related Allowance | 506 |
Mortgage loans, one-to-four family |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 368 | 388
Related Allowance | 0 | 0
Mortgage loans, one-to-four family | Collateral Pledged |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 49 |
Related Allowance | 0 |
Mortgage loans, commercial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 2,973 | 2,988
Related Allowance | 0 | 0
Mortgage loans, commercial | Collateral Pledged |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 1,158 |
Related Allowance | 0 |
Mortgage loans, construction - custom and owner/builder | Collateral Pledged |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 0 |
Related Allowance | 0 |
Consumer loans, home equity and second mortgage |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 382 | 394
Related Allowance | 0 | 0
Consumer loans, home equity and second mortgage | Collateral Pledged |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 618 |
Related Allowance | 0 |
Commercial business loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 286 | 309
Related Allowance | 123 | $ 127
Commercial business loans | Collateral Pledged |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Recorded Investment | 2,060 |
Related Allowance | $ 506 |

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