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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Impaired Loans by Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance 5,350 7,455
Total Impaired Loans Recorded Investment 5,350 7,455
Total Impaired Loans Unpaid Principal Balance 5,440 7,789
One-to four-family residential [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance 1,253 3,124
Total Impaired Loans Recorded Investment 1,253 3,124
Total Impaired Loans Unpaid Principal Balance 1,253 3,436
Commercial real estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance 3,680 4,088
Total Impaired Loans Recorded Investment 3,680 4,088
Total Impaired Loans Unpaid Principal Balance 3,680 4,110
Home equity lines of credit [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment Impaired Loans with Specific Allowance  
Related Allowance Impaired Loans with Specific Allowance  
Recorded Investment Impaired Loans with No Specific Allowance 58  
Total Impaired Loans Recorded Investment 58  
Total Impaired Loans Unpaid Principal Balance 58  
Commercial business [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment Impaired Loans with Specific Allowance
Related Allowance Impaired Loans with Specific Allowance
Recorded Investment Impaired Loans with No Specific Allowance 359 243
Total Impaired Loans Recorded Investment 359 243
Total Impaired Loans Unpaid Principal Balance $ 449 $ 243