SECURITIES - Narrative (Details) |
9 Months Ended | ||
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Jun. 30, 2026
USD ($)
security
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Jun. 30, 2025
USD ($)
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Sep. 30, 2025
USD ($)
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| 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 | 11,200,000 | 5,000,000.0 | |
| Impairment recognized | 200,000 | $ 0 | |
| Marketable | |||
| Debt Securities, Available-for-sale [Line Items] | |||
| Equity securities | 4,800,000 | 3,800,000 | |
| Unrealized gain (loss) | 0 | (100,000) | |
| Non-marketable | |||
| Debt Securities, Available-for-sale [Line Items] | |||
| Equity securities | 13,500,000 | 13,200,000 | |
| Unrealized gain (loss) | 1,700,000 | 1,100,000 | |
| Equity securities without readily determinable fair value, amount | $ 14,900,000 | $ 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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- Definition Number of Equity Securities Sold No definition available.
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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