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FAIR VALUE DISCLOSURES - Schedule of the Carrying Amount, Fair Value, and Placement in the Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Financial instruments - assets |  |
Investment securities held to maturity | $ 69,520 | $ 79,816
Carrying Value [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity | 69,520 | 79,816
Loan receivable net allowance for credit losses | 835,932 | 772,614
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 180,523 | 159,652
Borrowings | 36,054 | 28,568
Fair Value [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity | 62,591 | 72,617
Loan receivable net allowance for credit losses | 838,336 | 766,822
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 179,819 | 159,582
Borrowings | 35,409 | 28,151
Level 1 [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity |  |
Loan receivable net allowance for credit losses |  |
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates |  |
Borrowings |  |
Level 2 [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity | 62,591 | 72,617
Loan receivable net allowance for credit losses |  |
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 179,819 | 159,582
Borrowings | 35,409 | 28,151
Level 3 [Member] |  |
Financial instruments - assets |  |
Investment securities held to maturity |  |
Loan receivable net allowance for credit losses | 838,336 | 766,822
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates |  |
Borrowings |  |

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