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Loans Receivable and Allowance for Loan Losses: Schedule of Troubled Debt Restructured Loans (Details)
12 Months Ended
Sep. 30, 2019
USD ($)
contract
Sep. 30, 2018
USD ($)
contract
Sep. 30, 2017
USD ($)
contract
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan $ 3,269,000 $ 3,278,000  
Troubled debt restructured loan, subsequent default, number of contracts | contract 0 0 0
Troubled debt restructured loan, subsequent default, recorded investment $ 0 $ 0 $ 0
Portfolio Segment      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan $ 82,000    
Number of Contracts | contract 1    
Pre-Modification Outstanding Recorded Investment $ 85,000    
Post- Modification Outstanding Recorded Investment 85,000    
Mortgage loans, land      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan   153,000  
Mortgage loans, land | Portfolio Segment      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan $ 82,000 $ 323,000  
Number of Contracts | contract 1 3  
Pre-Modification Outstanding Recorded Investment $ 85,000 $ 427,000  
Post- Modification Outstanding Recorded Investment 85,000 338,000  
Commercial business loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 143,000 170,000  
Mortgage loans, one-to-four family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 634,000 509,000  
Mortgage loans, one-to-four family | Portfolio Segment      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan   $ 153,000  
Number of Contracts | contract   1  
Pre-Modification Outstanding Recorded Investment   $ 244,000  
Post- Modification Outstanding Recorded Investment   155,000  
Mortgage loans, commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 2,410,000 2,446,000  
Mortgage loans, commercial | Portfolio Segment      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan   $ 170,000  
Number of Contracts | contract   2  
Pre-Modification Outstanding Recorded Investment   $ 183,000  
Post- Modification Outstanding Recorded Investment   183,000  
Consumer loans, home equity and second mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 82,000    
Accruing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 2,903,000 2,955,000  
Accruing | Mortgage loans, land      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan   0  
Accruing | Commercial business loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 0 0  
Accruing | Mortgage loans, one-to-four family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 493,000 509,000  
Accruing | Mortgage loans, commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 2,410,000 2,446,000  
Accruing | Consumer loans, home equity and second mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 0    
Non- Accrual      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 366,000 323,000  
Non- Accrual | Mortgage loans, land      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan   153,000  
Non- Accrual | Commercial business loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 143,000 170,000  
Non- Accrual | Mortgage loans, one-to-four family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 141,000 0  
Non- Accrual | Mortgage loans, commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 0 $ 0  
Non- Accrual | Consumer loans, home equity and second mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan $ 82,000