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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, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 7,300 | $ 7,000
One-to four-family residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 1,131 | 2,841
Commercial real estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 3,948 | 3,881
Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 1,450 |
Home equity lines of credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 58 |
Commercial business [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 709 | 303
Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 7,296 | $ 7,025

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