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DERIVATIVE FINANCIAL INSTRUMENTS - Summary of Components of Interest Rate Swaps (Details) - Derivatives | 9 Months Ended | 12 Months Ended
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Sep. 30, 2025 | Dec. 31, 2024
Interest rate swaps - FHLB advances |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Weighted Average Pay Rate | 3.49% | 3.49%
Weighted Average Receive Rate | 4.31% | 4.53%
Weighted Average Maturity in Years | 2 years 6 months | 3 years 3 months 18 days
Interest rate swaps - commercial loans |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Weighted Average Pay Rate |  | 4.12%
Weighted Average Receive Rate |  | 4.53%
Weighted Average Maturity in Years |  | 2 years 8 months 12 days

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