EMPLOYEE BENEFIT PLANS - Additional Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Jul. 01, 2022	Jul. 01, 2021
ESOP loan balance	$ 2,600,000
Debt Instrument, Term	25 years
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 51,000	$ 0
Fair value of unallocated shares	2,300,000
Pentegra DB Plan [Member]
Defined benefit plan, Contributions by employer	$ 715,000	755,000
Market value of funding rate				120.63%	103.72%
FourHundredAndOne K Plan [Member]
Defined contribution plan, Employer matching contribution, Percent of employees gross pay	3.00%
Defined contribution plan, Employer discretionary contribution amount	$ 33,000	41,000
FourHundredAndOne K Plan [Member] | Maximum [Member]
Defined contribution plan, Voluntary contributions by Employees, Percent	15.00%
Defined contribution plan, Employer matching contribution, Percent of match	10.00%
FourHundredAndOne K Plan [Member] | Minimum [Member]
Defined contribution plan, Voluntary contributions by Employees, Percent	2.00%
Pension Plan [Member]
Defined benefit plan, Service cost	$ 735,000	780,000
Pension Plan [Member] | Pentegra DB Plan [Member]
Defined benefit plan, Contributions by employer		248,563,000	$ 253,199,000
Supplemental Employee Retirement Plan [Member]
Liability, Defined benefit plan	814,000	748,000
Pension and other postretirement benefits, Expenses	66,000	78,000
Postretirement Life Insurance [Member] | Split Dollar Agreements [Member]
Cash surrender value of life insurance	4,411,000	4,328,000
Other Postretirement Benefits Plan [Member] | Split Dollar Agreements [Member]
Pension and other postretirement benefits, Expenses	89,000	63,000
Postretirement Life Insurance In Connection With SERPs [Member]
Cash surrender value of life insurance	$ 5,733,000	$ 4,922,000
Tax-Qualified Retirement Plan [Member]
Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares per year	10,226