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SECURITIES - Narrative (Details) | 12 Months Ended
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Sep. 30, 2024 USD ($) security | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Number of securities in an unrealized loss position | security | 195 |  |
Securities pledged as collateral for public funds on deposit | $ 0 | $ 0 |
Securities pledged as collateral for individual, trust, and estate deposits | 0 | 0 |
Federal reserve bank stock | 19,700,000 | 19,700,000 |
Federal Reserve Bank and Federal Home Loan Bank Stock, at cost | 16,300,000 | 8,500,000 |
Loans | 4,029,859,000 | 4,316,411,000 |
Determinable fair value | 13,600,000 | 16,200,000 |
Impairment recognized | 1,000,000.0 | 3,300,000 | $ 0
Estimated Fair Value |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Loans and leases | 4,036,490,000 | 4,223,010,000 |
Marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 3,300,000 | 3,400,000 |
Unrealized loss | 100,000 | 200,000 |
Non-marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 11,800,000 | 8,400,000 |
Unrealized gains on marketable equity securities | (1,100,000) | 200,000 |
Realized gains on marketable equity securities | $ 2,500,000 |  |
Number of equity securities sold | security | 1 |  |
Non-marketable | Visa Class C Common Stock and Visa Class B-2 Common Stock |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Realized gains on marketable equity securities | $ 2,400,000 |  |
Asset Pledged as Collateral with Right | Estimated Fair Value | Federal Home Loan Bank Advances |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Loans and leases | 1,040,000,000.00 | 996,900,000 |
Asset Pledged as Collateral |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Investments | 533,800,000 | 773,600,000 |
Loans | 136,900,000 | 21,300,000 |
Federal Reserve Bank |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest and dividend income from FLHB | 1,200,000 | 1,200,000 | 1,200,000
Federal Home Loan Bank |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Interest and dividend income from FLHB | $ 700,000 | $ 500,000 | $ 300,000

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