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Benefit Plans - Schedule of Net Periodic Benefit Expense (Detail) - Benefit Equalization Plan, Postretirement Welfare Plan, Directors Consultation and Retirement Plan and Atlas Bank Retirement Income Plan [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Salaries and Employee Benefits [Member]        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 29 $ 26 $ 87 $ 79
Other Expense [Member]        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Interest cost 67 66 205 197
Amortization of unrecognized loss (20) (20) (60) (62)
Expected return on assets 27 28 83 85
Net periodic benefit cost $ 89 $ 84 $ 269 $ 253