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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, 2017
USD ($)
contract
Sep. 30, 2016
USD ($)
contract
Sep. 30, 2015
USD ($)
contract
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan $ 3,595,000 $ 8,160,000  
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   $ 48,000  
Number of Contracts | contract   1  
Pre-Modification Outstanding Recorded Investment   $ 48,000  
Post- Modification Outstanding Recorded Investment   48,000  
Mortgage loans, one-to-four family      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 569,000 1,476,000  
Mortgage loans, one-to-four family | Portfolio Segment      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan   $ 48,000  
Number of Contracts | contract   1  
Pre-Modification Outstanding Recorded Investment   $ 48,000  
Post- Modification Outstanding Recorded Investment   48,000  
Mortgage loans, commercial      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 2,219,000 5,268,000  
Mortgage loans, land      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 807,000 973,000  
Consumer loans, home equity and second mortgage      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan   443,000  
Accruing      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 3,342,000 7,629,000  
Accruing | Mortgage loans, one-to-four family      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 569,000 1,350,000  
Accruing | Mortgage loans, commercial      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 2,219,000 5,268,000  
Accruing | Mortgage loans, land      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 554,000 720,000  
Accruing | Consumer loans, home equity and second mortgage      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan   291,000  
Non- Accrual      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 253,000 531,000  
Non- Accrual | Mortgage loans, one-to-four family      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 0 126,000  
Non- Accrual | Mortgage loans, commercial      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan 0 0  
Non- Accrual | Mortgage loans, land      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan $ 253,000 253,000  
Non- Accrual | Consumer loans, home equity and second mortgage      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructured loan   $ 152,000