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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Economic Hedges and Non-hedging Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Interest rate swaps | Economic hedges | Industrial revenue bond |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain/(loss) recognized in other non-interest income | $ (124) | $ 88 | $ (13) | $ 163
Interest rate swaps | Economic hedges | Loans with commercial loan customers |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain/(loss) recognized in other non-interest income | 53,303 | (24,728) | 34,124 | (21,934)
Favorable change in credit valuation adjustment recognized in other non-interest income | 0 | 0 | 0 | 0
Reverse interest rate swaps | Economic hedges | Loans with commercial loan customers |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain/(loss) recognized in other non-interest income | (53,303) | 24,728 | (34,124) | 21,934
Risk participation agreements | Economic hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain/(loss) recognized in other non-interest income | 120 | 65 | 264 | 73
Forward commitments | Economic hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain/(loss) recognized in other non-interest income | 20 | (53) | 31 | 2
Commitments to lend | Non-hedging derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized gain/(loss) recognized in other non-interest income | 64 | (46) | 131 | (26)
Realized gain in other non-interest income | $ 350 | $ 210 | $ 1,909 | $ 304

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