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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, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 7,025 | $ 8,994
One-to four-family residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 2,841 | 3,914
Commercial real estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 3,881 | 3,823
Commercial business [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 303 | 1,162
Home equity lines of credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans |  | 91
Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans |  | $ 4

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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