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SECURITIES - Narrative (Details) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) security | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
AFS number of securities in an unrealized loss position (in securities) | security | 194 |  |
Federal reserve bank stock | $ 19,700,000 |  | $ 19,700,000
Federal home loan bank stock | 6,200,000 |  | 8,500,000
Impairment recognized | 0 | $ 500,000 |
Marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 4,300,000 |  | 3,400,000
Unrealized losses on equity securities | 0 | 0 |
Non-marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 10,000,000 |  | 8,400,000
Unrealized losses on equity securities | 400,000 |  |
Unrealized gains on equity securities | 2,500,000 | $ 100,000 |
Equity securities without readily determinable fair value, amount | $ 14,800,000 |  | $ 16,200,000
Number of equity securities sold | security | 1 |  |

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