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Loans Receivable And Allowance For Loan Losses - Land and Commercial Business Loans (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2019
USD ($)
contract
Jun. 30, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructured loan $ 3,269 $ 3,083
Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of contracts | contract 1  
Pre-modification TDR balance $ 85  
Post-modification TDR balance 85  
Troubled debt restructured loan $ 82  
Mortgage loans, land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructured loan   $ 132
Mortgage loans, land | Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of contracts | contract 1  
Pre-modification TDR balance $ 85  
Post-modification TDR balance 85  
Troubled debt restructured loan $ 82