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v3.26.1

SECURITIES - Narrative (Details) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2026 USD ($) security | Mar. 31, 2025 USD ($) | Sep. 30, 2025 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
AFS number of securities in an unrealized loss position (in securities) | security | 146 |  |
Federal reserve bank stock | $ 19,700,000 |  | $ 19,700,000
Federal home loan bank stock | 5,800,000 |  | 5,000,000.0
Impairment recognized | 0 | $ 0 |
Marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 4,600,000 |  | 3,800,000
Unrealized gain (loss) | 0 | (100,000) |
Non-marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 13,600,000 |  | 13,200,000
Unrealized gain (loss) | 0 | 800,000 |
Equity securities without readily determinable fair value, amount | $ 12,600,000 |  | $ 12,000,000.0
Number of equity securities sold | security | 0 |  |
Non-marketable | Visa |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities |  | 0 |
Realized gain on equity securities |  | $ 400,000 |

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