| **DERIVATIVES (Offsetting of Financial Liabilities) (Details) - USD ($) $ in Thousands**                                                                           | Sep. 30, 2016 | Dec. 31, 2015 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Offsetting Liabilities [Line Items]**                                                                                                                            |          |          |
| Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement                                          | $ 467,727     | $ 364,032     |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet                                                                                                   | 73,550        | 77,734        |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement | 394,177       | 286,298       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments, Total Derivative Liabilities                                          | 7,691         | 4,352         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Pledged, Total Derivative Liabilities                                        | 330,808       | 258,296       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | 55,678        | 23,650        |
| Total derivatives not subject to a master netting arrangement or similar arrangement                                                                               | 29,864        | 53,432        |
| Gross Amounts of Recognized Liabilities, Total Derivative Liabilities                                                                                              | 497,591       | 417,464       |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total Derivative Liabilities                                                     | 424,041       | 339,730       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total Derivatives Liabilities                                                    | 85,542        | 77,082        |
| Gross Amounts of Recognized Liabilities, Total Financial Liabilities                                                                                               | 497,591       | 417,464       |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Financial Liabilities                                                                      | 73,550        | 77,734        |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total Financial Liabilities                                                      | 424,041       | 339,730       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Financial Instruments, Total Financial Liabilities                                          | 7,691         | 4,352         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Cash Collateral Pledged, Total Financial Liabilities                                        | 330,808       | 258,296       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total Financial Liabilities                                                      | 85,542        | 77,082        |
| Other derivative activities                                                                                                                                        |          |          |
| **Offsetting Liabilities [Line Items]**                                                                                                                            |          |          |
| Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement                                          | 413,032       | 338,887       |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet                                                                                                   | 73,550        | 77,734        |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement | 339,482       | 261,153       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments, Total Derivative Liabilities                                          | 7,691         | 4,265         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Pledged, Total Derivative Liabilities                                        | 286,581       | 209,087       |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | 45,210        | 47,801        |
| Fair value hedges                                                                                                                                                  |          |          |
| **Offsetting Liabilities [Line Items]**                                                                                                                            |          |          |
| Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement                                          |          | 2,098         |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet                                                                                                   |          | 0             |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement |          | 2,098         |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments, Total Derivative Liabilities                                          |          | 87            |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Pledged, Total Derivative Liabilities                                        |          | 10,602        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement |          | (8,591)       |
| Cash flow hedges                                                                                                                                                   |          |          |
| **Offsetting Liabilities [Line Items]**                                                                                                                            |          |          |
| Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement                                          | 54,695        | 23,047        |
| Gross Amounts Offset in the Condensed Consolidated Balance Sheet                                                                                                   | 0             | 0             |
| Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement | 54,695        | 23,047        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments, Total Derivative Liabilities                                          | 0             | 0             |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Pledged, Total Derivative Liabilities                                        | 44,227        | 38,607        |
| Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement | $ 10,468      | $ (15,560)    |

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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.
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| - Definition
Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities.
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| - Definition
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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.
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| - Definition
Fair value, after effects of master netting arrangements, 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
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Fair value, after the 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 not elected to be offset.
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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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| - Definition
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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| - Definition
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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| - Definition
Fair value 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, not subject to a master netting arrangement.
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| - Definition
Amount, after the effects of master netting arrangements, of derivative liabilities, securities sold under agreements to repurchase and securities loaned. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after effects of master netting arrangements, of derivative liabilities, securities sold under agreements to repurchase and securities loaned offset against a right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
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| - Definition
Amount of asset associated with derivative liabilities, securities sold under agreements to repurchase and securities loaned.
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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities, securities sold under agreements to repurchase and securities loaned.
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| - Definition
Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities, securities sold under agreements to repurchase and securities loaned.
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| - Definition
Amount, before effects of master netting arrangements, of derivative liabilities, securities sold under agreements to repurchase and securities loaned. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.
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No definition available.
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