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Off-Balance Sheet Financial Instruments and Guarantees (Schedule of Fair Value, Off-balance Sheet Risks) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 264,007 | $ 260,036
Commitments to Grant Loans [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 88,184 | 101,466
Unfunded Commitments Under Lines of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 162,207 | 145,636
Standby Letters of Credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 13,616 | $ 12,934

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