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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Impaired Loans by Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
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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 | 6,507 | 7,455
Total Impaired Loans Recorded Investment | 6,507 | 7,455
Total Impaired Loans Unpaid Principal Balance | 6,747 | 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 | 2,503 | 3,124
Total Impaired Loans Recorded Investment | 2,503 | 3,124
Total Impaired Loans Unpaid Principal Balance | 2,653 | 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 | 3,642 | 4,088
Total Impaired Loans Recorded Investment | 3,642 | 4,088
Total Impaired Loans Unpaid Principal Balance | 3,642 | 4,110
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 | 362 | 243
Total Impaired Loans Recorded Investment | 362 | 243
Total Impaired Loans Unpaid Principal Balance | $ 452 | $ 243

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