v3.26.1
Benefit Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ 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]      
Service cost $ 605 $ 71 $ 77
Interest cost $ 410 $ 360 $ 369
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Expected return on assets $ (90) $ (90) $ (92)
Defined Benefit Plan, Amortization of Gain (Loss) (143) (106) (58)
Net periodic benefit cost 782 235 296
Atlas Bank Retirement Income Plan ("ABRIP")      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Interest cost 83 82 81
Expected return on assets (90) (90) (93)
Defined Benefit Plan, Amortization of Gain (Loss) 24 33 42
Net periodic benefit cost $ 17 $ 25 $ 30
Discount rate 5.75% 5.50% 5.00%
Long term rate of return on plan assets 3.50% 3.50% 3.50%
Benefit Equalization Plan ("BEP")      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Interest cost $ 100 $ 117 $ 115
Defined Benefit Plan, Amortization of Gain (Loss) 0 38 42
Net periodic benefit cost $ 100 $ 155 $ 157
Discount rate 5.75% 5.50% 5.00%
Postretirement Welfare Plan      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 68 $ 71 $ 79
Interest cost 54 57 50
Defined Benefit Plan, Amortization of Gain (Loss) (66) (48) (42)
Net periodic benefit cost $ 56 $ 80 $ 87
Discount rate 5.75% 5.50% 5.00%
Salary increase rate 3.25% 3.25% 3.25%
Directors' Consultation and Retirement Plan ("DCRP")      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Interest cost $ 138 $ 130 $ 124
Defined Benefit Plan, Amortization of Gain (Loss) (101) (128) (99)
Net periodic benefit cost $ 37 $ 2 $ 25
Discount rate 5.75% 5.50% 5.00%
Supplemental Executive Retirement Plan (SERP)      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 537 $ 0  
Interest cost 49 0  
Net periodic benefit cost $ 586 $ 0  
Discount rate 5.75% 0.00%  
Salary increase rate 4.00% 0.00%