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Employee Benefits - Additional Information (Detail) - USD ($)
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Expected contribution by the association in the year 2021 $ 146,000      
Estimated net loss (59,000)      
Prior service cost 0      
Transition obligation $ 0      
Discount rates 4.02% 2.65%    
Annual rate of health care cost, increase 9.00%   8.50% 8.50%
Matching contribution contributed by the association under the plan 25.00%      
Percentage of employee's compensation 5.00%      
Employer contributions $ 90,000 $ 88,000    
Employer contributions $ 2,000,000 $ 1,800,000    
Normal retirement age of directors 72 years      
Benefit cost discount rate 2.65% 2.32%    
Deferred Profit Sharing [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions $ 676,000 $ 650,000    
Minimum [Member] | Deferred Profit Sharing [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Employer Profit Sharing contribution under the Plan 5.00%      
Deferred Compensation Agreements [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Expected annual rate of health care cost, decrease (5.00%)      
Benefit cost discount rate 6.00%      
Employer contributions $ 278,000 $ 251,000