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Loans and Allowance for Loan Losses - Non Accruals (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Mortgages on real estate:    
Total $ 270 $ 541
One- to four-family [Member]    
Mortgages on real estate:    
Total 191 414
Home equity lines of credit [Member]    
Mortgages on real estate:    
Total 17 20
Consumer Loans [Member]    
Mortgages on real estate:    
Total 8 29
Commercial [Member]    
Mortgages on real estate:    
Total 6 18
Commercial Business Loans [Member]    
Mortgages on real estate:    
Total $ 48 $ 60