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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 - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 117 $ 138 $ 234 $ 276
Interest cost 96 69 192 138
(Accretion) amortization of unrecognized (gain) loss (6) 20 (12) 40
Expected return on assets (25) (28) (50) (56)
Net periodic benefit cost $ 182 $ 199 $ 364 $ 398