| **DERIVATIVES (Offsetting of Financial Assets) (Details) - USD ($) $ in Thousands**                                                                                 | Sep. 30, 2016 | Dec. 31, 2015 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Offsetting Assets [Line Items]**                                                                                                                                  |          |          |
| Gross Amounts of Recognized Assets, Total derivatives subject to a master netting arrangement or similar arrangement                                                | $ 490,808     | $ 390,663     |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Derivative Assets                                                                           | 5,190         | 10,161        |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement       | 485,618       | 380,502       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments, Total Derivative Assets                                               | 0             | 8,008         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received, Total Derivative Assets                                            | 8,505         | 21,784        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | 477,113       | 350,710       |
| Total derivatives not subject to a master netting arrangement or similar arrangement                                                                                | 9,185         | 2,532         |
| Gross Amounts of Recognized Assets, Total Derivative Assets                                                                                                         | 499,993       | 393,195       |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total Derivative Assets                                                                | 494,803       | 383,034       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total Derivative Assets                                                          | 486,298       | 353,242       |
| Gross Amounts of Recognized Assets, Total Financial Assets                                                                                                          | 499,993       | 393,195       |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Financial Assets                                                                            | 5,190         | 10,161        |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total Financial Assets                                                                 | 494,803       | 383,034       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments, Total Financial Assets                                                | 0             | 8,008         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received, Total Financial Assets                                             | 8,505         | 21,784        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total Financial Assets                                                           | 486,298       | 353,242       |
| Other derivative activities                                                                                                                                         |          |          |
| **Offsetting Assets [Line Items]**                                                                                                                                  |          |          |
| Gross Amounts of Recognized Assets, Total derivatives subject to a master netting arrangement or similar arrangement                                                | 487,445       | 379,626       |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Derivative Assets                                                                           | 5,190         | 10,161        |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement       | 482,255       | 369,465       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments, Total Derivative Assets                                               | 0             | 8,008         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received, Total Derivative Assets                                            | 8,505         | 21,784        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | 473,750       | 339,673       |
| Fair value hedges                                                                                                                                                   |          |          |
| **Offsetting Assets [Line Items]**                                                                                                                                  |          |          |
| Gross Amounts of Recognized Assets, Total derivatives subject to a master netting arrangement or similar arrangement                                                |          | 3,742         |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Derivative Assets                                                                           |          | 0             |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement       |          | 3,742         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments, Total Derivative Assets                                               |          | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received, Total Derivative Assets                                            |          | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement |          | 3,742         |
| Cash flow hedges                                                                                                                                                    |          |          |
| **Offsetting Assets [Line Items]**                                                                                                                                  |          |          |
| Gross Amounts of Recognized Assets, Total derivatives subject to a master netting arrangement or similar arrangement                                                | 3,363         | 7,295         |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Derivative Assets                                                                           | 0             | 0             |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement       | 3,363         | 7,295         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments, Total Derivative Assets                                               | 0             | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received, Total Derivative Assets                                            | 0             | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | $ 3,363       | $ 7,295       |

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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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Fair value, before effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and elected not to be offset.
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Fair value of liability associated with financial asset or other 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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| - Definition
Fair value, after effects of master netting arrangements, deduction of assets not subject to a master netting arrangement and elected not to be offset, of financial asset or other 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 an obligation to return collateral.
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Fair value of financial asset or other 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, not subject to a master netting arrangement.
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| - Definition
Amount, after the effects of master netting arrangements, of derivative assets, securities purchased under agreements to resell and securities borrowed. Includes assets not subject to a master netting arrangement and not elected to be offset.
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Amount, after effects of master netting arrangements, of derivative assets, securities purchased under agreements to resell and securities borrowed offset against an obligation to return collateral under a master netting arrangement. Includes assets not subject to a master netting arrangement and not elected to be offset.
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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets, securities purchased under agreements to resell and securities borrowed.
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| - Definition
Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets, securities purchased under agreements to resell and securities borrowed.
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| - Definition
Amount, before effects of master netting arrangements, of derivative assets, securities purchased under agreements to resell and securities borrowed. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.
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Amount of liability associated with derivative assets, securities purchased under agreements to resell and securities borrowed.
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| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.
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Fair value, before effects of master netting arrangements, of a financial asset or other 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 assets elected not to be offset. Excludes assets not subject to a master netting arrangement.
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Fair value, after effects of master netting arrangements, of financial asset or other 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 an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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No definition available.
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