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Benefit Plans - Schedule of Net Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 77 $ 281 $ 547
Interest cost 369 369 279
Expected return on assets (92) (99) (110)
(Accretion) amortization of unrecognized (gain) loss (58) (24) 80
Net periodic benefit cost 296 527 796
Atlas Bank Retirement Income Plan ("ABRIP")      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Interest cost 81 78 62
Expected return on assets (93) (99) (110)
(Accretion) amortization of unrecognized (gain) loss 42 28 21
Net periodic benefit cost $ 30 $ 7 $ (27)
Discount rate 5.00% 4.50% 3.00%
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 $ 115 $ 111 $ 86
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Other expense
(Accretion) amortization of unrecognized (gain) loss 42 46 $ 71
Net periodic benefit cost $ 157 $ 157 $ 157
Discount rate 5.00% 4.50% 3.00%
Postretirement Welfare Plan      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 79 $ 95 $ 116
Interest cost 50 48 33
(Accretion) amortization of unrecognized (gain) loss (42) (28) (12)
Net periodic benefit cost $ 87 $ 115 $ 137
Discount rate 5.00% 4.50% 3.00%
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 $ 124 $ 117 $ 92
(Accretion) amortization of unrecognized (gain) loss (99) (69) 0
Net periodic benefit cost $ 25 $ 48 $ 92
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other expense    
Discount rate 5.00% 4.50% 3.00%
Supplemental Executive Retirement Plan (SERP)      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0 $ 185  
Interest cost 0 11  
Net periodic benefit cost $ 0 $ 196  
Discount rate 0.00% 3.00%  
Salary increase rate 0.00% 4.00%