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Loans and Allowance for Loan Losses - Non Accruals (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Mortgages on real estate:    
Total $ 94 $ 405
One- to four-family [Member]    
Mortgages on real estate:    
Total 35 81
Real Estate Loans Home Equity Lines Of Credit [Member]    
Mortgages on real estate:    
Total   15
Consumer Loans [Member]    
Mortgages on real estate:    
Total 4 5
Commercial Business Loans [Member]    
Mortgages on real estate:    
Total $ 55 $ 304