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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
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Salaries and Employee Benefits [Member]      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 54 $ 48 $ 31
Miscellaneous Non Interest Expense [Member]      
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]      
Interest cost 378 373 379
Amortization of unrecognized loss 43 45 66
Expected return on assets (112) (120) (248)
Net periodic benefit cost $ 363 $ 346 $ 228