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Commitments and Credit Risk - Additional Information (Detail) - USD ($) | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Commitments And Contingencies Disclosure [Line Items] |  |
Outstanding commitments to originate loans amount | $ 19,137,000 | $ 16,873,000
Loan amount commitments at fixed rates of interest | $ 7,594,000 | $ 5,178,000
Weighted average interest rates for fixed rate loan commitments | 3.59% | 3.49%
Commercial [Member] |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Lines of credit to borrowers | $ 93,339,000 | $ 78,600,000
Open End Consumer Lines [Member] |  |
Commitments And Contingencies Disclosure [Line Items] |  |
Lines of credit to borrowers | $ 10,633,000 | $ 7,582,000

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