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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Average Recorded Investment in Impaired Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 10,627 | $ 17,278
One-to four-family residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 2,996 | 8,401
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 5,437 | 4,980
Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans |  | 2,231
Home equity lines of credit |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 333 | 479
Commercial business |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 1,861 | $ 1,187

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