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Employee Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Expected contribution by the association in the year 2021	$ 191,000
Estimated net loss	(59,000)
Prior service cost	0
Transition obligation	$ 0
Discount rates	3.25%	3.25%
Annual rate of health care cost, increase	9.00%
Matching contribution contributed by the association under the plan	25.00%
Percentage of employee's compensation	5.00%
Employer contributions	$ 81,000	$ 68,000
Employer contributions	$ 1,600,000	1,500,000
Normal retirement age of directors	72 years
Deferred Profit Sharing [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 602,000	510,000
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	$ 249,000	$ 220,000
Minimum [Member] | Deferred Profit Sharing [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Profit Sharing contribution under the Plan	5.00%

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