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FAIR VALUE DISCLOSURES - Schedule of the Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Financial instruments - assets |  |
Loan receivable net allowance for credit losses | $ 3,200 | $ 3,900
Carrying Value [Member] |  |
Financial instruments - assets |  |
Investment securities held-to-maturity | 67,266 | 79,816
Loan receivable net allowance for credit losses | 849,003 | 772,614
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 209,948 | 159,652
Borrowings | 49,054 | 28,568
Fair Value [Member] |  |
Financial instruments - assets |  |
Investment securities held-to-maturity | 61,160 | 72,617
Loan receivable net allowance for credit losses | 855,377 | 766,822
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 210,168 | 159,582
Borrowings | 48,576 | 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 | 61,160 | 72,617
Loan receivable net allowance for credit losses |  |
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates | 210,168 | 159,582
Borrowings | 48,576 | 28,151
Level 3 [Member] |  |
Financial instruments - assets |  |
Investment securities held-to-maturity |  |
Loan receivable net allowance for credit losses | 855,377 | 766,822
Financial instruments - liabilities |  |
Certificates of deposit including retirement certificates |  |
Borrowings |  |

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