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Loans Receivable And Allowance For Loan Losses - Land and Commercial Business Loans (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
contract
Sep. 30, 2019
USD ($)
contract
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of contracts | contract 125  
Troubled debt restructured loan $ 3,220 $ 3,269
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 $ 136  
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