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Benefit Plans - Schedule of Net Funded Status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Change in benefit obligation:      
Service cost $ 281 $ 547 $ 106
Interest cost 369 279 262
Atlas Bank Retirement Income Plan ("ABRIP")      
Change in benefit obligation:      
Projected benefit obligation - beginning 1,816 2,149  
Interest cost 78 62 61
Actuarial gain (46) (247)  
Benefit payments (148) (148)  
Projected benefit obligation - ending 1,700 1,816 2,149
Change in plan assets:      
Fair value of assets - beginning 2,907 3,220  
Actual return on assets (42) (165)  
Premiums/claims paid (148) (148)  
Fair value of assets - ending 2,717 2,907 3,220
Reconciliation of funded status:      
Projected benefit obligation (1,700) (1,816) (2,149)
Fair value of assets 2,717 2,907 3,220
Funded status included in other assets / liabilities 1,017 1,091  
Accumulated benefit obligation $ (1,700) $ (1,816)  
Valuation assumptions      
Discount rate 5.00% 4.50%  
Benefit Equalization Plan ("BEP")      
Change in benefit obligation:      
Projected benefit obligation - beginning $ 2,592 $ 2,999  
Interest cost 111 86 85
Actuarial gain (34) (252)  
Benefit payments (244) (241) (239)
Projected benefit obligation - ending 2,425 2,592 2,999
Change in plan assets:      
Fair value of assets - beginning 0 0  
Contributions 244 241 239
Premiums/claims paid (244) (241)  
Fair value of assets - ending 0 0 0
Reconciliation of funded status:      
Projected benefit obligation (2,425) (2,592) (2,999)
Fair value of assets 0 0 0
Funded status included in other assets / liabilities (2,425) (2,592)  
Accumulated benefit obligation $ (2,425) $ (2,592)  
Valuation assumptions      
Discount rate 5.00% 4.50%  
Postretirement Welfare Plan      
Change in benefit obligation:      
Projected benefit obligation - beginning $ 1,085 $ 1,108  
Service cost 95 116 106
Interest cost 48 33 27
Actuarial gain (214) (160)  
Benefit payments (13) (12) (12)
Plan amendments 35 0  
Projected benefit obligation - ending 1,036 1,085 1,108
Change in plan assets:      
Fair value of assets - beginning 0 0  
Contributions 13 12 12
Premiums/claims paid (13) (12)  
Fair value of assets - ending 0 0 0
Reconciliation of funded status:      
Projected benefit obligation (1,036) (1,085) (1,108)
Fair value of assets 0 0 0
Funded status included in other assets / liabilities $ (1,036) $ (1,085)  
Valuation assumptions      
Discount rate 5.00% 4.50%  
Salary increase rate 3.25% 3.25%  
Directors' Consultation and Retirement Plan ("DCRP")      
Change in benefit obligation:      
Projected benefit obligation - beginning $ 2,646 $ 3,116  
Interest cost 117 92 89
Actuarial gain (194) (513)  
Benefit payments (49) (49)  
Projected benefit obligation - ending 2,520 2,646 3,116
Change in plan assets:      
Fair value of assets - beginning 0 0  
Contributions 49 49 69
Premiums/claims paid (49) (49)  
Fair value of assets - ending 0 0 0
Reconciliation of funded status:      
Projected benefit obligation (2,520) (2,646) (3,116)
Fair value of assets 0 0 0
Funded status included in other assets / liabilities (2,520) (2,646)  
Accumulated benefit obligation $ (2,520) $ (2,646)  
Valuation assumptions      
Discount rate 5.00% 4.50%  
Supplemental Executive Retirement Plan (SERP)      
Change in benefit obligation:      
Projected benefit obligation - beginning $ 437 $ 0  
Service cost 185 431  
Interest cost 11 6  
Projected benefit obligation - ending 633 437 0
Reconciliation of funded status:      
Projected benefit obligation (633) (437) $ 0
Funded status included in other assets / liabilities $ (633) $ (437)  
Valuation assumptions      
Discount rate 3.00% 3.00%  
Salary increase rate   4.00%