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Loans Receivable and Allowance for Loan Losses Loans Receivable and Allowance for Loan Losses: Schedule of Troubled Debt Restructured Loans (Details)
12 Months Ended
Sep. 30, 2018
USD ($)
contract
Sep. 30, 2017
USD ($)
contract
Sep. 30, 2016
USD ($)
contract
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan $ 3,278,000 $ 3,595,000  
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, Modifications [Line Items]      
Troubled debt restructured loan $ 323,000    
Number of Contracts | contract 3    
Pre-Modification Outstanding Recorded Investment $ 427,000    
Post- Modification Outstanding Recorded Investment 338,000    
Mortgage loans, land      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 153,000 807,000  
Mortgage loans, land | Portfolio Segment      
Financing Receivable, Modifications [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    
Commercial business loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 170,000    
Commercial business loans | Portfolio Segment      
Financing Receivable, Modifications [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    
Mortgage loans, one-to-four family      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 509,000 569,000  
Mortgage loans, commercial      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 2,446,000 2,219,000  
Accruing      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 2,955,000 3,342,000  
Accruing | Mortgage loans, land      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 0 554,000  
Accruing | Commercial business loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 0    
Accruing | Mortgage loans, one-to-four family      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 509,000 569,000  
Accruing | Mortgage loans, commercial      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 2,446,000 2,219,000  
Non- Accrual      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 323,000 253,000  
Non- Accrual | Mortgage loans, land      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 153,000 253,000  
Non- Accrual | Commercial business loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 170,000    
Non- Accrual | Mortgage loans, one-to-four family      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 0 0  
Non- Accrual | Mortgage loans, commercial      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan $ 0 $ 0