Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Unearned Employee Stock Ownership Plan shares	6,022,000	6,022,000
Common stock, par value	$ 0.01	$ 0.01
ESOP Compensation Expense	$ 2,500,000	$ 2,100,000	$ 2,400,000
Multiemployer Plans, Postretirement Benefit [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer Plan Number	001
Defined Benefit Plan, Funded Percentage		113.78%	102.31%
Multiemployer Plans, Plan Contributions		$ 248,600,000	$ 253,200,000
Multiemployer Plans, Plan Expenses	$ 372,000	329,000	340,000
Multiemployer Plans, Postretirement Benefit [Member] | Maximum [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of Total Plan Contributions	5.00%
Employees’ Savings and Profit Sharing Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Maximum Annual Contribution Per Employee	75.00%
Employer Matching Contribution	3.50%
Defined Contribution Plan, eligible employee contribution	6.00%
Defined Contribution Plan, Cost Recognized	$ 1,400,000	1,300,000	1,100,000
Benefit Equalization Plan ("BEP") [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
ESOP Compensation Expense	40,000	37,000	24,000
ESOP Liability	20,000	18,000
Defined Benefit Plan, Accumulated Other Comprehensive Income Net (Losses) Gains, after Tax	(707,000)	(1,000,000.0)
Defined Benefit Plan, Benefits Paid	241,000	239,000
Defined Benefit Plan, Contributions by Employer	241,000	239,000	237,000
Defined benefit plan, expected future benefit payments, next twelve months	240,000
Atlas Bank Retirement Income Plan ("ABRIP") [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive Income Net (Losses) Gains, after Tax	(475,000)	(496,000)
Defined Benefit Plan, Benefits Paid	148,000	148,000
Defined benefit plan, expected future benefit payments, next twelve months	146,000
Postretirement Welfare Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive Income Net (Losses) Gains, after Tax	377,000	230,000
Defined Benefit Plan, Benefits Paid	12,000	12,000
Defined Benefit Plan, Contributions by Employer	12,000	12,000	11,000
Defined benefit plan, expected future benefit payments, next twelve months	50,000
Directors' Consultation and Retirement Plan ("DCRP") [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Other Comprehensive Income Net (Losses) Gains, after Tax	716,000	203,000
Defined Benefit Plan, Benefits Paid	49,000	69,000
Defined Benefit Plan, Contributions by Employer	49,000	$ 69,000	$ 60,000
Defined benefit plan, expected future benefit payments, next twelve months	$ 71,000
Second Step Conversion and Stock Offering [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Unearned Employee Stock Ownership Plan shares	2,409,764
Additional Shares In ESOP	3,612,500
Common stock, par value	$ 10.00
ESOP Outstanding Principal And Interest	$ 3,800,000
Employer Additional Loan to ESOP	36,100,000
ESOP Outstanding Loan Principal Amount	$ 28,200,000