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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Impaired Loans by Class) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance | $ 2,905 |
Related Allowance Impaired Loans with Specific Allowance | 221 |
Recorded Investment Impaired Loans with No Specific Allowance | 9,054 | 10,354
Total Impaired Loans Recorded Investment | 11,959 | 10,354
Total Impaired Loans Unpaid Principal Balance | 12,024 | 10,354
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 | 2,170 | 1,405
Total Impaired Loans Recorded Investment | 2,170 | 1,405
Total Impaired Loans Unpaid Principal Balance | 2,170 | 1,405
Commercial real estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance | 599 |
Related Allowance Impaired Loans with Specific Allowance | 46 |
Recorded Investment Impaired Loans with No Specific Allowance | 2,723 | 4,593
Total Impaired Loans Recorded Investment | 3,322 | 4,593
Total Impaired Loans Unpaid Principal Balance | 3,322 | 4,593
Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance | 2,306 |
Related Allowance Impaired Loans with Specific Allowance | 175 |
Recorded Investment Impaired Loans with No Specific Allowance | 2,835 | 2,900
Total Impaired Loans Recorded Investment | 5,141 | 2,900
Total Impaired Loans Unpaid Principal Balance | 5,206 | 2,900
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 | 1,326 | 1,456
Total Impaired Loans Recorded Investment | 1,326 | 1,456
Total Impaired Loans Unpaid Principal Balance | $ 1,326 | $ 1,456

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