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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, 2021 | Sep. 30, 2021
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance | $ 2,835 | $ 2,835
Related Allowance Impaired Loans with Specific Allowance | 224 | 224
Recorded Investment Impaired Loans with No Specific Allowance | 7,670 | 8,233
Total Impaired Loans Recorded Investment | 10,505 | 11,068
Total Impaired Loans Unpaid Principal Balance | 10,570 | 11,133
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 | 2,217 | 2,711
Total Impaired Loans Recorded Investment | 2,217 | 2,711
Total Impaired Loans Unpaid Principal Balance | 2,217 | 2,711
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 | 2,202 | 2,270
Total Impaired Loans Recorded Investment | 2,202 | 2,270
Total Impaired Loans Unpaid Principal Balance | 2,202 | 2,270
Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment Impaired Loans with Specific Allowance | 2,835 | 2,835
Related Allowance Impaired Loans with Specific Allowance | 224 | 224
Recorded Investment Impaired Loans with No Specific Allowance | 1,745 | 1,745
Total Impaired Loans Recorded Investment | 4,580 | 4,580
Total Impaired Loans Unpaid Principal Balance | 4,645 | 4,645
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 | 1,506 | 1,507
Total Impaired Loans Recorded Investment | 1,506 | 1,507
Total Impaired Loans Unpaid Principal Balance | $ 1,506 | $ 1,507

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