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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
Sep. 30, 2019
Sep. 30, 2018
Salaries and Employee Benefits [Member]    
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 20 $ 14
Miscellaneous Non Interest Expense [Member]    
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]    
Interest cost 81 94
Amortization of unrecognized loss 5 11
Expected return on assets (28) (28)
Net periodic benefit cost $ 78 $ 91