| **DERIVATIVES - Offsetting of Financial Liabilities (Details) - USD ($) $ in Thousands**                                                                            | Sep. 30, 2023 | Dec. 31, 2022 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Offsetting Liabilities [Line Items]**                                                                                                                             |          |          |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheets                                                                                                   | $ (4,609)     | $ (21,726)    |
| Gross Amounts of Recognized Liabilities, Total Derivative Liabilities                                                                                               | 1,958,015     | 2,045,999     |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets, Total Derivative Liabilities                                                     | 1,953,406     | 2,024,273     |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged, Total Derivative Liabilities                                             | (319,131)     | (452,316)     |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount, Total Derivatives Liabilities                                                    | 1,634,275     | 1,571,957     |
| Other derivative activities                                                                                                                                         |          |          |
| **Offsetting Liabilities [Line Items]**                                                                                                                             |          |          |
| Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement                                           | 1,422,348     | 1,354,746     |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheets                                                                                                   | (4,609)       | (21,726)      |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets, Total derivatives subject to a master netting arrangement or similar arrangement | 1,417,739     | 1,333,020     |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged                                                                           | (118,509)     | (149,381)     |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | 1,299,230     | 1,183,639     |
| Fair value hedges                                                                                                                                                   |          |          |
| **Offsetting Liabilities [Line Items]**                                                                                                                             |          |          |
| Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement                                           | 1,606         | 5,520         |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheets                                                                                                   | 0             | 0             |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets, Total derivatives subject to a master netting arrangement or similar arrangement | 1,606         | 5,520         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged                                                                           | 0             | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | 1,606         | 5,520         |
| Cash flow hedges                                                                                                                                                    |          |          |
| **Offsetting Liabilities [Line Items]**                                                                                                                             |          |          |
| Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement                                           | 534,061       | 685,733       |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheets                                                                                                   | 0             | 0             |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheets, Total derivatives subject to a master netting arrangement or similar arrangement | 534,061       | 685,733       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged                                                                           | (200,622)     | (302,935)     |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | $ 333,439     | $ 382,798     |

| X                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Derivative Liability, Collateral, Right To Reclaim Cash, Including Not Subject To Master Netting Arrangement
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No definition available.
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| - Definition
Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.
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| - Definition
Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Includes derivative not subject to master netting arrangement or similar agreement.
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| - Definition
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| - Definition
Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.
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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset.
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Fair value, after effects of master netting arrangements, deduction of liabilities not subject to a master netting arrangement and elected not to be offset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, offset against the right to receive collateral.
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