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Off-Balance Sheet Financial Instruments and Guarantees (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 203,733 | $ 119,347
Commitments to grant loans [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 76,029 | 49,806
Unfunded commitments under lines of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 122,050 | 65,854
Standby letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 5,654 | $ 3,687

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