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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, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | $ 10,676 | $ 16,477 | $ 10,661 | $ 16,724
One-to four-family residential [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 3,553 | 6,937 | 3,374 | 7,532
Commercial real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 5,211 | 5,215 | 5,289 | 5,159
Construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans |  | 1,942 |  | 2,054
Home equity lines of credit |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | 139 | 484 | 231 | 599
Commercial business |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average investment in impaired loans | $ 1,773 | $ 1,899 | $ 1,767 | $ 1,380

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