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Benefit Plans - Schedule of Fair Value Measurements of ABRIP's Assets (Detail) - Atlas Bank Retirement Income Plan ("ABRIP") [Member] - USD ($)
$ in Thousands
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]      
Prudential Guaranteed Deposit Fund $ 2,907 $ 3,220 $ 3,299
Prudential Guaranteed Deposit Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Prudential Guaranteed Deposit Fund 2,907 3,220  
Prudential Guaranteed Deposit Fund [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Prudential Guaranteed Deposit Fund $ 2,907 $ 3,220