| **DERIVATIVES (Offsetting of Financial Assets) (Details) - USD ($) $ in Thousands**                                     | Sep. 30, 2015 | Dec. 31, 2014 |
|-------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Offsetting Assets [Line Items]**                                                                                      |          |          |
| Gross Amounts of Recognized Assets                                                                                      | $ 418,944     | $ 384,107     |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet                                                        | 9,015         | 21,109        |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet                                             | 409,929       | 362,998       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments                            | 8,027         | 10,020        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received                         | 45,306        | 5,940         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount                                        | 356,596       | 347,038       |
| Total derivatives not subject to a master netting arrangement or similar arrangement(2)                                 | 5,480         | 3,063         |
| Gross Amounts of Recognized Assets, Total Derivative Assets                                                             | 424,424       | 387,170       |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total Derivative Assets                    | 415,409       | 366,061       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total Derivative Assets              | 362,076       | 350,101       |
| Gross Amounts of Recognized Assets, Total Financial Assets                                                              | 424,424       | 387,170       |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Financial Assets                                | 9,015         | 21,109        |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total Financial Assets                     | 415,409       | 366,061       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments, Total Financial Assets    | 8,027         | 10,020        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received, Total Financial Assets | 45,306        | 5,940         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total Financial Assets               | 362,076       | 350,101       |
| Other derivative activities                                                                                             |          |          |
| **Offsetting Assets [Line Items]**                                                                                      |          |          |
| Gross Amounts of Recognized Assets                                                                                      | 415,236       | 373,545       |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet                                                        | 9,015         | 21,109        |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet                                             | 406,221       | 352,436       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments                            | 8,027         | 10,020        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received                         | 45,306        | 5,940         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount                                        | 352,888       | 336,476       |
| Fair value hedges                                                                                                       |          |          |
| **Offsetting Assets [Line Items]**                                                                                      |          |          |
| Gross Amounts of Recognized Assets                                                                                      | 3,708         | 2,943         |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet                                                        | 0             | 0             |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet                                             | 3,708         | 2,943         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments                            | 0             | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received                         | 0             | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount                                        | 3,708         | 2,943         |
| Cash flow hedges                                                                                                        |          |          |
| **Offsetting Assets [Line Items]**                                                                                      |          |          |
| Gross Amounts of Recognized Assets                                                                                      | 0             | 7,619         |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet                                                        | 0             | 0             |
| Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet                                             | 0             | 7,619         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments                            | 0             | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Received                         | 0             | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount                                        | $ 0           | $ 7,619       |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Derivative Asset, Fair Value, Amount Offset Against Collateral, Subject to Master Netting Arrangement or Similar Arrangement
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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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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, 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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| - Definition
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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Amount of obligation to return securities collateral under master netting arrangements that have not been offset against derivative assets.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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| - Definition
Fair value, after offset of derivative liability, 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.
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| - Definition
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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