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STOCK-BASED COMPENSATION AND STOCK REPURCHASE PROGRAM (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 173 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Sep. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Treasury stock, shares | 112,996 | 112,996 | 112,996 | 112,996
ESOP compensation expense | $ 99,000 | $ 50 |  |
Number of ESOP shares intended to by purchased by Trustees in connection with the second-step conversion offering | 312,800 |  | 312,800 |
Percentage of common shares sold | 8.00% |  |  |
2006 ESOP Trust [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Cost of shares repurchased by ESOP trust | $ 2,300 |  |  |
Average cost of shares repurchased (per share) | $ 10.58 |  |  |
Description of loan with respect to employee stock ownership plan | The Company’s ESOP (“2006 ESOP”) was established in 2006 as part of the Company’s initial public offering. The total cost of the 217,863 shares purchased by the 2006 ESOP trust was $2.3 million, reflecting an average cost per share of $10.58. The 2006 ESOP loan was fully repaid during the year ended September 30, 2021, and all shares were allocated to participants. |  |  |
Shares allocated | 217,863 |  | 217,863 |
2021 ESOP Trust [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Cost of shares repurchased by ESOP trust | $ 3,400 |  |  |
Average cost of shares repurchased (per share) | $ 10.77 |  |  |
Description of loan with respect to employee stock ownership plan | The total cost of the shares purchased by the 2021 ESOP trust was $3.4 million, reflecting an average cost per share of $10.77. The 2021 ESOP loan bears a variable interest rate that adjusts annually to the Prime Rate (3.25% at January 1, 2022) with principal and interest payable annually in equal installments over thirty years. |  |  |
Interest rate of loan with respect to employee stock ownership plan | 3.25% |  | 3.25% |
First Repurchase Program [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Stock authorized to be repurchased (in shares) | 130,927 |  | 130,927 |
Second Repurchase Program [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |
Maximum stock repurchase authorization (as a percent) |  |  | 5.00% |
Stock authorized to be repurchased (in shares) | 129,924 |  | 129,924 |
Stock repurchased during period (in shares) |  |  | 91,000 |
Common stock average cost (in dollars per share) |  |  | $ 8.41 |

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