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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, 2021 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 10,787 | $ 13,680
One-to four-family residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 2,464 | 2,490
Commercial real estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 2,236 | 4,370
Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 4,580 | 4,861
Commercial business [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 1,507 | $ 1,959

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524 + Details
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