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DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Carrying Amount and Cumulative Adjustment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Carrying Amounts of Hedged Assets |  | $ 100,000
Cumulative Amounts of Fair Value Hedging Adjustments Included in the Carrying Amounts of the Hedged Assets | $ 0 | $ 2,260
Hedged Asset, Statement of Financial Position [Extensible Enumeration] |  | Other liabilities

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