v3.26.1
Benefit Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
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 $ 1,500 $ 1,400 $ 1,400
Maximum employee contribution percentage 75.00%    
Maximum employer matching contribution percentage 3.50%    
Eligible employee contribution 6.00%    
Plan expense amount $ 1,500 $ 1,500 $ 1,400
The Pentagra DB Plan      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Multiemployer plan number 001    
Funded status   104.18% 97.94%
Total contributions   $ 67,200 $ 63,400
Total expense recorded $ 143 252 172
The Pentagra DB Plan | 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 $ 19 15 12
ESOP liability 12 13  
Unrecognized net gain (loss) included in accumulated other comprehensive income (180) (155)  
Benefit payments 178 196 246
Contributions 178 196  
Defined benefit plan, expected future benefit payments, next twelve months 178    
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 (249) (444)  
Benefit payments 143 148  
Defined benefit plan, expected future benefit payments, next twelve months 134    
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 748 729  
Benefit payments 14 13 13
Contributions 14 13 13
Defined benefit plan, expected future benefit payments, next twelve months 64    
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 735 775  
Benefit payments 128 79  
Contributions 128 $ 79 $ 49
Defined benefit plan, expected future benefit payments, next twelve months $ 177    
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 $ 20,600