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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Schedule of Interest Rate Swap Agreements and Non-hedging Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Offsetting Assets [Line Items] |  |
Notional Amount | $ 4,524,514 | $ 3,711,905
Estimated Fair Value Asset (Liability) | (43,167) | 43,426
Fair value estimates, impact of settled to market contract | 38,300 | 45,700
Economic hedges: | Interest rate swap | Tax advantaged economic development bonds |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 7,100 |
Cash Flow Hedging |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 800,000 |
Estimated Fair Value Asset (Liability) | 1,937 |
Cash Flow Hedging | Interest rate swap | Commercial Loan |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 400,000 |
Weighted Average Maturity (in years) | 2 years 8 months 12 days |
Weighted Average Rate - Received | 4.09% |
Weighted Average Rate - Contract pay rate | 3.51% |
Estimated Fair Value Asset (Liability) | $ 0 |
Cash Flow Hedging | Forward Starting Interest Rate Swaps | Commercial Loan |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 200,000 |
Weighted Average Maturity (in years) | 3 years 3 months 18 days |
Weighted Average Rate - Received | 0.00% |
Weighted Average Rate - Contract pay rate | 3.90% |
Estimated Fair Value Asset (Liability) | $ 0 |
Cash Flow Hedging | Interest Rate Collars | Commercial Loan |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 200,000 |
Weighted Average Maturity (in years) | 3 years 6 months |
Estimated Fair Value Asset (Liability) | $ 1,937 |
Hedging derivatives | Economic hedges: |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 3,720,400 | 3,703,713
Estimated Fair Value Asset (Liability) | (45,121) | 43,302
Hedging derivatives | Economic hedges: | Interest rate swap |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 3,400,000 |
Hedging derivatives | Economic hedges: | Interest rate swap | Tax advantaged economic development bonds |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 7,062 | $ 7,879
Weighted Average Maturity (in years) | 6 years 10 months 24 days | 7 years 10 months 24 days
Weighted Average Rate - Received | 4.49% | 0.47%
Weighted Average Rate - Contract pay rate | 5.09% | 5.09%
Estimated Fair Value Asset (Liability) | $ (193) | $ (1,158)
Hedging derivatives | Economic hedges: | Interest rate swap | Commercial loan |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 1,685,263 | $ 1,684,238
Weighted Average Maturity (in years) | 5 years 8 months 12 days | 5 years 9 months 18 days
Weighted Average Rate - Received | 4.11% | 3.99%
Weighted Average Rate - Contract pay rate | 5.55% | 1.91%
Estimated Fair Value Asset (Liability) | $ (95,114) | $ 74,348
Hedging derivatives | Economic hedges: | Reverse interest rate swaps | Commercial loan |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 1,685,263 | $ 1,684,238
Weighted Average Maturity (in years) | 5 years 8 months 12 days | 5 years 9 months 18 days
Weighted Average Rate - Received | 5.55% | 1.91%
Weighted Average Rate - Contract pay rate | 4.11% | 3.99%
Estimated Fair Value Asset (Liability) | $ 50,267 | $ (30,454)
Hedging derivatives | Economic hedges: | Risk participation agreements |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 341,885 | $ 320,981
Weighted Average Maturity (in years) | 6 years 7 months 6 days | 5 years 9 months 18 days
Estimated Fair Value Asset (Liability) | $ (89) | $ 432
Hedging derivatives | Economic hedges: | Forward Sale commitments |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 927 | $ 6,377
Weighted Average Maturity (in years) | 2 months 12 days | 2 months 12 days
Estimated Fair Value Asset (Liability) | $ 8 | $ 134
Hedging derivatives | Cash Flow Hedging | Interest rate swap |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 600,000 |
Hedging derivatives | Cash Flow Hedging | Interest Rate Collars |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 200,000 |
Non-hedging derivatives: |  |
Offsetting Assets [Line Items] |  |
Notional Amount | 4,114 | 8,192
Estimated Fair Value Asset (Liability) | 17 | 124
Non-hedging derivatives: | Commitments to Lend |  |
Offsetting Assets [Line Items] |  |
Notional Amount | $ 4,114 | $ 8,192
Weighted Average Maturity (in years) | 2 months 12 days | 2 months 12 days
Estimated Fair Value Asset (Liability) | $ 17 | $ 124

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