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Loans Receivable And Allowance For Loan Losses: Loan Segment Risk Narrative (Details)
12 Months Ended
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Ratio of loans to appraisal or purchase price 90.00%
Mortgage loans, one-to-four family  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Ratio of loans to appraisal or purchase price 90.00%
Ratio of loans to appraised value, private mortgage insurance requirement, percentage limit 80.00%
Mortgage loans, commercial  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Ratio of loans to appraisal or purchase price 80.00%
Mortgage loans, land  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Ratio of loans to appraisal or purchase price 75.00%