v3.25.2
Benefit Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Shares purchased by ESOP 6,022,000 6,022,000  
Common stock, par value (in dollars per share) $ 0.01 $ 0.01  
ESOP compensation expense $ 5,300 $ 2,800 $ 1,900
Maximum employee contribution percentage 75.00%    
Maximum employer matching contribution percentage 3.50%    
Eligible employee contribution 6.00%    
Plan expense amount $ 1,500 $ 1,400 $ 1,400
Multiemployer Plans, Postretirement Benefit      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Multiemployer plan number 001    
Funded status   97.94% 98.87%
Total contributions   $ 63,400 $ 151,800
Total expense recorded $ 252 172 180
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 $ 15 12 17
ESOP liability 13 13  
Unrecognized net gain (loss) included in accumulated other comprehensive income (155) (544)  
Benefit payments 196 246 244
Contributions 196 246 244
Defined benefit plan, expected future benefit payments, next twelve months 176    
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 (444) (528)  
Benefit payments 148 160  
Defined benefit plan, expected future benefit payments, next twelve months 154    
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 729 576  
Benefit payments 13 13  
Contributions 13 13  
Defined benefit plan, expected future benefit payments, next twelve months 62    
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 775 922  
Benefit payments 79 49  
Contributions 79 $ 49 $ 49
Defined benefit plan, expected future benefit payments, next twelve months $ 176    
Second Step Conversion and Stock Offering      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Shares purchased by ESOP 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 $ 22,600