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Loans and Allowance for Loan Losses - Non Accruals (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Mortgages on real estate:    
Total $ 242 $ 541
One- to four-family [Member]    
Mortgages on real estate:    
Total 174 414
Multi-family [Member]    
Mortgages on real estate:    
Total 0  
Home equity lines of credit [Member]    
Mortgages on real estate:    
Total 16 20
Construction [Member]    
Mortgages on real estate:    
Total 0  
Consumer Loans [Member]    
Mortgages on real estate:    
Total 7 29
Commercial [Member]    
Mortgages on real estate:    
Total 4 18
Commercial Business Loans [Member]    
Mortgages on real estate:    
Total $ 41 $ 60