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Benefit Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
ESOP, number of shares purchased (in shares) 6,022,000 6,022,000  
Common stock, par value (in dollars per share) $ 0.01 $ 0.01  
ESOP compensation expense $ 1,900 $ 2,500 $ 2,100
Maximum employee contribution percentage 75.00%    
Maximum employer matching contribution percentage 3.50%    
Eligible employee contribution 6.00%    
Plan expense amount $ 1,400 $ 1,400 $ 1,300
Multiemployer Plans, Postretirement Benefit      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Multiemployer plan number 001    
Funded status   103.17% 113.78%
Total contributions   $ 142,400 $ 248,600
Total expense recorded $ 180 372 329
Multiemployer Plans, Postretirement Benefit | Maximum      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of contributions compared to total contributions 5.00%    
Benefit Equalization Plan ("BEP")      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
ESOP compensation expense $ 17 40 37
ESOP liability 16 20  
Unrecognized net gain (loss) included in accumulated other comprehensive income (626) (707)  
Benefit payments 244 241 239
Contributions 244 241 239
Defined benefit plan, expected future benefit payments, next twelve months 241    
Atlas Bank Retirement Income Plan ("ABRIP")      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Unrecognized net gain (loss) included in accumulated other comprehensive income (475) (475)  
Benefit payments 148 148  
Defined benefit plan, expected future benefit payments, next twelve months 146    
Postretirement Welfare Plan      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Unrecognized net gain (loss) included in accumulated other comprehensive income 529 377  
Benefit payments 13 12 12
Contributions 13 12 12
Defined benefit plan, expected future benefit payments, next twelve months 54    
Directors' Consultation and Retirement Plan ("DCRP")      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Unrecognized net gain (loss) included in accumulated other comprehensive income 840 716  
Benefit payments 49 49  
Contributions 49 $ 49 $ 69
Defined benefit plan, expected future benefit payments, next twelve months $ 72    
Second Step Conversion and Stock Offering      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
ESOP, number of shares purchased (in shares) 2,409,764    
Additional shares in ESOP (in shares) 3,612,500    
Common stock, par value (in dollars per share) $ 10.00    
Amount of outstanding principal and interest refinanced $ 3,800    
Employer additional loan to ESOP 36,100    
ESOP outstanding loan principal amount $ 26,400