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Off-Balance Sheet Financial Instruments and Guarantees (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | ---
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 143,983 | $ 126,100
Commitments to grant loans [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 61,826 | 49,936
Unfunded commitments under lines of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 78,092 | 71,859
Standby letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 4,065 | $ 4,305

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