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DERIVATIVES - Additional Information (Details) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) entity | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) entity | Dec. 31, 2022 USD ($)
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 18,504,223 |  | $ 19,339,867 |
Number of counterparties | entity | 6 |  | 6 |
Derivative liabilities | $ 293,926 |  | $ 263,131 |
Derivative Liability, Fair Value of Collateral, net of restricted cash | 142,100 |  | 116,200 |
Derivative Liability, Fair Value of Collateral | 162,100 |  | 137,800 |
Restricted Cash | 20,000 |  | 21,600 |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax | (336) | $ 0 | $ 3,755 | $ 0
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net | 700 |  |  |
Client derivative fees | $ 1,250 | $ 1,005 |  |
Foreign Exchange |  |  |  |
Derivative [Line Items] |  |  |  |
Number of counterparties | entity | 5 |  | 5 |
Credit Risk Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 217,600 |  | $ 232,500 |
Credit Risk Derivative Liabilities, at Fair Value | 100 |  | 100 |
Interest Rate Lock Commitments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 43,600 |  | 25,200 |
Other Credit Derivatives [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 38,300 |  | 25,500 |
Credit Risk Derivative Liabilities, at Fair Value | 500 |  |  |
Credit Risk Derivative Assets, at Fair Value |  |  | (300) |
Other Contract-Mortgage |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 108,600 |  | 109,200 |
Derivative |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities | 120,000 |  | 95,700 |
Derivative | Foreign Exchange |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount |  |  | 7,000,000 |
Derivative liabilities | 36,300 |  | 23,900 |
Accrued interest and other liabilities | Derivative |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 2,200,000 |  | $ 2,200,000 |
Accrued interest and other liabilities | Derivative | Foreign Exchange |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 6,600,000 |  |  |

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