| **ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (Details) - USD ($) $ in Thousands**                                                            | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Net of Tax [Roll Forward]**         |           |           |   |   |
| Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, pretax activity                                         | $ (45,805)     | $ 13,667       | $ (67,051) | $ (3,453) |
| Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, tax effect                                              | 16,975         | (5,018)        | 25,226 | 1,259 |
| Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, net activity                                            | (28,830)       | 8,649          | (41,825) | (2,194) |
| Reclassification adjustment for net gains/(losses) on cash flow hedge derivative financial instruments, pretax activity                           | 1,774          | 13,797         | 9,957 | 41,264 |
| Reclassification adjustment for net gains/(losses) on cash flow hedge derivative financial instruments, tax effect                                | (657)          | (5,065)        | (3,746) | (15,048) |
| Reclassification adjustment for net gains/(losses) on cash flow hedge derivative financial instruments, net activity                              | 1,117          | 8,732          | 6,211 | 26,216 |
| Net unrealized gains (losses) on cash flow hedge derivative financial instruments, pretax activity                                                | (44,031)       | 27,464         | (57,094) | 37,811 |
| Net unrealized gains (losses) on cash flow hedge derivative financial instruments, tax effect                                                     | 16,318         | (10,083)       | 21,480 | (13,789) |
| Net unrealized gains (losses) on cash flow hedge derivative financial instruments, net activity                                                   | (27,713)       | 17,381         | (35,614) | 24,022 |
| **Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Roll Forward]**                            |           |           |   |   |
| Total accumulated other comprehensive income/(loss), net unrealized gains/(losses) on investment securities available-for-sale, beginning balance | (74,758)       | (70,404)       | (52,515) | (199,392) |
| Change in unrealized gains/(losses) on investment securities available-for-sale, pretax activity                                                  | 135,217        | (28,911)       | 121,737 | 2,623,062 |
| Change in unrealized gains/(losses) on investment securities available-for-sale, tax effect                                                       | (52,711)       | 11,294         | (48,564) | (1,028,228) |
| Change in unrealized gains/(losses) on investment securities available-for-sale, net activity                                                     | 82,506         | (17,617)       | 73,173 | 1,594,834 |
| Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, pretax activity                                 | 1,993          | (131)          | (18,363) | (2,440,019) |
| Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, tax effect                                      | (777)          | 51             | 7,325 | 956,476 |
| Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, net activity                                    | 1,216          | (80)           | (11,038) | (1,483,543) |
| Reclassification adjustment for net gains included in net income/(expense) on OTTI securities, pretax activity                                    | 0              |           | (1,092) |   |
| Reclassification adjustment for net gains included in net income/(expense) on OTTI securities, tax effect                                         | 0              |           | 436 |   |
| Reclassification adjustment for net gains included in net income/(expense) on OTTI securities, net activity                                       | 0              |           | (656) |   |
| Net unrealized gains/(losses) on investment securities available-for-sale, pretax activity                                                        | 137,210        | (29,042)       | 102,282 | 183,043 |
| Net unrealized gains/(losses) on investment securities available-for-sale, tax effect                                                             | (53,488)       | 11,345         | (40,803) | (71,752) |
| Net unrealized gains/(losses) on investment securities available-for-sale, net activity                                                           | 83,722         | (17,697)       | 61,479 | 111,291 |
| Total accumulated other comprehensive income/(loss), net unrealized gains/(losses) on investment securities available-for-sale, ending balance    | 8,964          | (88,101)       | 8,964 | (88,101) |
| **Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Roll Forward]**                      |           |           |   |   |
| Pension and post-retirement actuarial gain/(loss), pretax activity                                                                                | 1,018          | 447            | 3,054 | 1,341 |
| Pension and post-retirement actuarial gain/(loss), tax effect                                                                                     | (398)          | (175)          | (1,382) | (234) |
| Pension and post-retirement actuarial gain/(loss), net activity                                                                                   | 620            | 272            | 1,672 | 1,107 |
| Total accumulated other comprehensive income/(loss), beginning balance                                                                            | (125,502)      | (117,904)      | (96,410) | (254,368) |
| Total other comprehensive income/(loss), pretax activity                                                                                          | 94,197         | (1,131)        | 48,242 | 222,195 |
| Total other comprehensive income/(loss), tax effect                                                                                               | (37,568)       | 1,087          | (20,705) | (85,775) |
| TOTAL OTHER COMPREHENSIVE (LOSS)/INCOME, NET OF TAX                                                                                               | 56,629         | (44)           | 27,537 | 136,420 |
| Total accumulated other comprehensive income/(loss), ending balance                                                                               | (68,873)       | (117,948)      | (68,873) | (117,948) |
| Net unrealized gains/(losses) on cash flow hedge derivative financial instruments                                                                 |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Roll Forward]**                      |           |           |   |   |
| Total accumulated other comprehensive income/(loss), beginning balance                                                                            | (22,161)       | (32,782)       | (14,260) | (39,423) |
| Total accumulated other comprehensive income/(loss), ending balance                                                                               | (49,874)       | (15,401)       | (49,874) | (15,401) |
| Pension and post-retirement actuarial gain/(loss)                                                                                                 |           |           |   |   |
| **Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Roll Forward]**                      |           |           |   |   |
| Total accumulated other comprehensive income/(loss), beginning balance                                                                            | (28,583)       | (14,718)       | (29,635) | (15,553) |
| Total accumulated other comprehensive income/(loss), ending balance                                                                               | $ (27,963)     | $ (14,446)     | $ (27,963) | $ (14,446) |

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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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No definition available.
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| - Definition
Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.
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| - Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.
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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.
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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.
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Amount before tax, after reclassification adjustments of other comprehensive income (loss).
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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.
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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.
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Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.
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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
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