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Loans Receivable and Allowance for Loan Losses: Schedule of Troubled Debt Restructured Loans (Details)
12 Months Ended
Sep. 30, 2020
USD ($)
contract
Sep. 30, 2019
USD ($)
contract
Sep. 30, 2018
USD ($)
contract
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan $ 3,071,000 $ 3,269,000  
Troubled debt restructured loan, subsequent default, number of contracts | contract 0 1 3
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 $ 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
Mortgage loans, land      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 130,000    
Mortgage loans, land | 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  
Commercial business loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan   143,000  
Mortgage loans, one-to-four family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 483,000 634,000  
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 2,385,000 2,410,000  
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 73,000 82,000  
Mortgage loans, multi-family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 0    
Accruing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 2,868,000 2,903,000  
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  
Accruing | Mortgage loans, one-to-four family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 483,000 493,000  
Accruing | Mortgage loans, commercial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 2,385,000 2,410,000  
Accruing | Consumer loans, home equity and second mortgage      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 0 0  
Accruing | Mortgage loans, multi-family      
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 203,000 366,000  
Non- Accrual | Mortgage loans, land      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 130,000    
Non- Accrual | Commercial business loans      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan   143,000  
Non- Accrual | Mortgage loans, one-to-four family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan 0 141,000  
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 73,000 $ 82,000  
Non- Accrual | Mortgage loans, multi-family      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled debt restructured loan $ 0