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DERIVATIVES - (Derivative position) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount, derivative asset |  | $ 700,000
Interest rate swaps and caps related to customer deposits and borrowings |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount, derivative asset |  | $ 700,000
Derivatives designated as hedges | Interest rate swaps and caps related to customer deposits and borrowings |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount, derivative asset | $ 700,000 |
Fair Value, Other Assets | 1,530 |
Fair Value, Other Liabilities | 4,880 |
Derivatives not designated as hedges | Interest rate swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount, derivative asset | 69,000 |
Fair Value, Other Assets | 1,157 |
Fair Value, Other Liabilities | $ 1,157 |

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