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Loans Receivable (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Loans Receivable (Details) [Line Items]    
Loans receivable, description One- to four-family loans in process of foreclosure totaled $563,000 and $694,000 at September 30, 2020 and June 30, 2020, respectively.  
Banks had granted deferrals $ 18,100,000  
Troubled debt restructuring, description At September 30, 2020, 81 loans totaling $16.2 million had completed their approved deferral periods and $16.0 million or 98.6% had returned to normal repayment status. At September 30, 2020, 15 loans totaling $1.9 million remained on their original deferral periods.  
Loans classified as TDRs $ 1,800,000 $ 1,900,000
Net of a purchase credit discount $ 351,000 $ 351,000
Troubled Debt Restructuring [Member]    
Loans Receivable (Details) [Line Items]    
Bankruptcy proceedings, percentage 23.70%