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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Interest rate swaps | Economic hedges | Industrial revenue bond |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized (loss)/gain recognized in other non-interest income | $ 142 | $ 217 | $ 75 | $ 649
Interest rate swaps | Economic hedges | Loans with commercial loan customers |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized (loss)/gain recognized in other non-interest income | (24,230) | (44,927) | 2,794 | (123,625)
Favorable change in credit valuation adjustment recognized in other non-interest income | 0 | 0 | 0 | 1,809
Reverse interest rate swaps | Economic hedges | Loans with commercial loan customers |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized (loss)/gain recognized in other non-interest income | 24,230 | 44,927 | (2,794) | 123,625
Risk participation agreements | Economic hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized (loss)/gain recognized in other non-interest income | 25 | (292) | 8 | (400)
Forward commitments | Economic hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized (loss)/gain recognized in other non-interest income | 48 | 11 | 55 | (116)
Commitments to lend | Non-hedging derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized (loss)/gain recognized in other non-interest income | 11 | 8 | 20 | (98)
Realized gain in other non-interest income | $ 54 | $ 90 | $ 94 | $ 342

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