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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | $ 12,855 | $ 10,276 | $ 13,290 | $ 10,302
One-to four-family residential [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 2,373 | 1,787 | 2,449 | 1,659
Commercial real estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 4,006 | 2,995 | 4,139 | 3,528
Construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 4,580 | 4,053 | 4,767 | 3,669
Commercial business [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | $ 1,896 | $ 1,441 | $ 1,935 | $ 1,446

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