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LOANS RECEIVABLE, NET AND RELATED ALLOWANCE FOR LOAN LOSSES (Schedule of Impaired Loans by Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance | $ 2,344 | $ 2,905
Related Allowance Impaired Loans with Specific Allowance | 39 | 221
Recorded Investment Impaired Loans with No Specific Allowance | 10,168 | 11,256
Total Impaired Loans Recorded Investment | 12,512 | 14,161
Total Impaired Loans Unpaid Principal Balance | 12,577 | 14,430
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 | 2,367 | 2,601
Total Impaired Loans Recorded Investment | 2,367 | 2,601
Total Impaired Loans Unpaid Principal Balance | 2,367 | 2,601
Commercial real estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance | 599 | 599
Related Allowance Impaired Loans with Specific Allowance | 10 | 46
Recorded Investment Impaired Loans with No Specific Allowance | 3,077 | 3,806
Total Impaired Loans Recorded Investment | 3,676 | 4,405
Total Impaired Loans Unpaid Principal Balance | 3,676 | 4,405
Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance | 1,745 | 2,306
Related Allowance Impaired Loans with Specific Allowance | 29 | 175
Recorded Investment Impaired Loans with No Specific Allowance | 2,835 | 2,835
Total Impaired Loans Recorded Investment | 4,580 | 5,141
Total Impaired Loans Unpaid Principal Balance | 4,645 | 5,206
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 | 1,889 | 2,014
Total Impaired Loans Recorded Investment | 1,889 | 2,014
Total Impaired Loans Unpaid Principal Balance | $ 1,889 | $ 2,218

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