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Employee Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Expected contribution by the association in the year 2021	$ 154,000
Estimated net loss	(26,000)
Prior service cost	0
Transition obligation	$ 0
Discount rates	2.65%	2.32%
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	$ 88,000	$ 81,000
Employer contributions	$ 1,800,000	$ 1,600,000
Normal retirement age of directors	72 years
Benefit cost discount rate	2.32%	3.25%
Deferred Profit Sharing [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 650,000	$ 602,000
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	$ 251,000	$ 249,000

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