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Loans Receivable And Allowance For Loan Losses - Land and Commercial Business Loans (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2018
USD ($)
contract
Jun. 30, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Troubled Debt Restructuring $ 3,278 $ 3,208
Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Modifications, Number of Contracts | contract 3  
Pre-modification TDR balance $ 427  
Post-modification TDR balance 338  
Financing Receivable, Troubled Debt Restructuring 323  
Commercial business loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Troubled Debt Restructuring $ 170 $ 149
Commercial business loans | Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Modifications, Number of Contracts | contract 2  
Pre-modification TDR balance $ 183  
Post-modification TDR balance 183  
Financing Receivable, Troubled Debt Restructuring 170  
Mortgage loans, land    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Troubled Debt Restructuring $ 153  
Mortgage loans, land | Portfolio Segment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Modifications, Number of Contracts | contract 1  
Pre-modification TDR balance $ 244  
Post-modification TDR balance 155  
Financing Receivable, Troubled Debt Restructuring $ 153