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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 | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans |  |  | $ 8,900 | $ 6,500
One-to four-family residential [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | $ 1,344 | $ 1,878 | 1,273 | 2,360
Commercial real estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 4,133 | 3,661 | 4,067 | 3,771
Construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 2,900 |  | 2,900 |
Home equity lines of credit [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 20 | 29 | 32 | 15
Commercial business [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 533 | 361 | 591 | 332
Other [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | $ 8,930 | $ 5,929 | $ 8,863 | $ 6,478

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