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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Classes of the Loan Portfolio Summarized by Aging Categories) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Current | $ 500,504 | $ 470,416
Total Past Due | 2,154 | 3,575
Non - Accrual | 572 | 2,358
Total loans receivable | 502,658 | 473,991
One-to four-family residential [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Current | 180,774 | 176,546
Total Past Due | 250 | 1,790
Non - Accrual | 250 | 1,663
Total loans receivable | 181,024 | 178,336
Commercial real estate [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Current | 214,842 | 206,218
Total Past Due | 1,216 | 900
Non - Accrual | 148 | 482
Total loans receivable | 216,058 | 207,118
Construction [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Current | 29,663 | 22,622
Total Past Due |  |
Non - Accrual |  |
Total loans receivable | 29,663 | 22,622
Home equity lines of credit [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Current | 19,181 | 18,344
Total Past Due | 51 | 192
Non - Accrual | 51 |
Total loans receivable | 19,232 | 18,536
Commercial business [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Current | 50,561 | 40,420
Total Past Due | 627 | 693
Non - Accrual | 123 | 213
Total loans receivable | 51,188 | 41,113
Other [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Current | 5,483 | 6,266
Total Past Due | 10 |
Non - Accrual |  |
Total loans receivable | 5,493 | 6,266
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 147 | 818
30-59 Days Past Due [Member] | One-to four-family residential [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  |
30-59 Days Past Due [Member] | Commercial real estate [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  | 418
30-59 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  |
30-59 Days Past Due [Member] | Home equity lines of credit [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  |
30-59 Days Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 147 | 400
30-59 Days Past Due [Member] | Other [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  |
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 1,126 | 399
60-89 Days Past Due [Member] | One-to four-family residential [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  | 127
60-89 Days Past Due [Member] | Commercial real estate [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 759 |
60-89 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  |
60-89 Days Past Due [Member] | Home equity lines of credit [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  | 192
60-89 Days Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 357 | 80
60-89 Days Past Due [Member] | Other [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 10 |
90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 881 | 2,358
90 Days Past Due [Member] | One-to four-family residential [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 250 | 1,663
90 Days Past Due [Member] | Commercial real estate [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 457 | 482
90 Days Past Due [Member] | Construction [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  |
90 Days Past Due [Member] | Home equity lines of credit [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 51 |
90 Days Past Due [Member] | Commercial business [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due | 123 | 213
90 Days Past Due [Member] | Other [Member] |  |
Financing Receivable, Recorded Investment, Aging [Abstract] |  |
Total Past Due |  |

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