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SECURITIES - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) security | Jun. 30, 2024 USD ($) security | Jun. 30, 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 | 193 | 193 |  |
Federal reserve bank stock | $ 19,700,000 | $ 19,700,000 |  | $ 19,700,000
Federal home loan bank stock | 4,800,000 | 4,800,000 |  | 8,500,000
Impairment recognized |  | 1,000,000 | $ 3,200,000 |
Marketable |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Equity securities | 4,300,000 | 4,300,000 |  | 3,400,000
Unrealized losses on equity securities |  | 200,000 | 200,000 |
Non-marketable |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Equity securities | 10,500,000 | 10,500,000 |  | 8,400,000
Unrealized losses on equity securities |  | 600,000 |  |
Unrealized gains on equity securities |  | 2,500,000 | $ 100,000 |
Equity securities without readily determinable fair value, amount | 13,800,000 | $ 13,800,000 |  | $ 16,200,000
Realized gain on equity securities | $ 2,400,000 |  |  |
Number of equity securities sold | security |  | 1 |  |

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