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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, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | $ 9,652 | $ 12,855 | $ 10,124 | $ 13,290
One-to four-family residential [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 1,877 | 2,373 | 2,155 | 2,449
Commercial real estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 1,690 | 4,006 | 1,883 | 4,139
Construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 4,580 | 4,580 | 4,580 | 4,767
Commercial business [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 1,505 | $ 1,896 | 1,506 | $ 1,935
Home equity lines of credit [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans |  |  |  |
Other [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans |  |  |  |

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