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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, 2017 | Sep. 30, 2016
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance |  | $ 997
Related Allowance Impaired Loans with Specific Allowance |  | 39
Recorded Investment Impaired Loans with No Specific Allowance | 7,315 | 8,256
Total Impaired Loans Recorded Investment | 7,315 | 9,253
Total Impaired Loans Unpaid Principal Balance | 8,715 | 10,099
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 | 2,795 | 4,010
Total Impaired Loans Recorded Investment | 2,795 | 4,010
Total Impaired Loans Unpaid Principal Balance | 2,921 | 4,239
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 | 4,138 | 3,843
Total Impaired Loans Recorded Investment | 4,138 | 3,843
Total Impaired Loans Unpaid Principal Balance | 4,138 | 3,843
Commercial business [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance |  | 997
Related Allowance Impaired Loans with Specific Allowance |  | 39
Recorded Investment Impaired Loans with No Specific Allowance | 370 | 250
Total Impaired Loans Recorded Investment | 370 | 1,247
Total Impaired Loans Unpaid Principal Balance | 1,644 | 1,850
Other [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 | 12 |
Total Impaired Loans Recorded Investment | 12 |
Total Impaired Loans Unpaid Principal Balance | $ 12 |
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 |  | 153
Total Impaired Loans Recorded Investment |  | 153
Total Impaired Loans Unpaid Principal Balance |  | $ 167

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