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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Impaired Loans by Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance |  |
Related Allowance Impaired Loans with Specific Allowance |  |
Recorded Investment Impaired Loans with No Specific Allowance | 8,731 | 5,861
Total Impaired Loans Recorded Investment | 8,731 | 5,861
Total Impaired Loans Unpaid Principal Balance | 8,821 | 5,952
One-to four-family residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance |  |
Related Allowance Impaired Loans with Specific Allowance |  |
Recorded Investment Impaired Loans with No Specific Allowance | 1,130 | 1,132
Total Impaired Loans Recorded Investment | 1,130 | 1,132
Total Impaired Loans Unpaid Principal Balance | 1,130 | 1,132
Commercial real estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance |  |
Related Allowance Impaired Loans with Specific Allowance |  |
Recorded Investment Impaired Loans with No Specific Allowance | 3,935 | 3,961
Total Impaired Loans Recorded Investment | 3,935 | 3,961
Total Impaired Loans Unpaid Principal Balance | 3,935 | 3,961
Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance |  |
Related Allowance Impaired Loans with Specific Allowance |  |
Recorded Investment Impaired Loans with No Specific Allowance | 2,900 |
Total Impaired Loans Recorded Investment | 2,900 |
Total Impaired Loans Unpaid Principal Balance | 2,900 |
Home equity lines of credit [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance |  |
Related Allowance Impaired Loans with Specific Allowance |  |
Recorded Investment Impaired Loans with No Specific Allowance | 58 | 58
Total Impaired Loans Recorded Investment | 58 | 58
Total Impaired Loans Unpaid Principal Balance | 58 | 58
Commercial business [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance |  |
Related Allowance Impaired Loans with Specific Allowance |  |
Recorded Investment Impaired Loans with No Specific Allowance | 708 | 710
Total Impaired Loans Recorded Investment | 708 | 710
Total Impaired Loans Unpaid Principal Balance | $ 798 | $ 801

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