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Commitments and Credit Risk - Additional Information (Detail) - USD ($)
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Commitments And Contingencies Disclosure [Line Items]    
Outstanding commitments to originate loans amount $ 28,024,000 $ 19,137,000
Loan amount commitments at fixed rates of interest $ 15,704,000 $ 7,594,000
Weighted average interest rates for fixed rate loan commitments 4.36% 3.59%
Commercial [Member]    
Commitments And Contingencies Disclosure [Line Items]    
Lines of credit to borrowers $ 116,284,000 $ 93,339,000
Open End Consumer Lines [Member]    
Commitments And Contingencies Disclosure [Line Items]    
Lines of credit to borrowers $ 11,468,000 $ 10,633,000