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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, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | $ 8,994 | $ 10,627
One-to four-family residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 3,914 | 2,996
Commercial real estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 3,823 | 5,437
Home equity lines of credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 91 | 333
Commercial business [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average investment in impaired loans | 1,162 | $ 1,861
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=66008989&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=66008989&loc=d3e5258-111524 + Details
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