| **ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (Details) (USD $)In Thousands, unless otherwise specified**                                                                                                                                                                                                                                                                                                                                                           | 3 Months Ended | 6 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Net of Tax [Roll Forward]**                                                                                                                                                                                                                                                                                                                               |           |                |   |  |   |  |   |  |
| Accumulated other comprehensive income (loss), cash flow hedge derivative financial instruments, beginning balance                                                                                                                                                                                                                                                                                                                                                      | $ (31,663)     |                | $ (68,345) |  | $ (39,423) |  | $ (79,174) |  |
| Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, pretax activity                                                                                                                                                                                                                                                                                                                                                               | (15,472)       |                | 6,457 |  | (17,120) |  | 7,926 |  |
| Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, tax effect                                                                                                                                                                                                                                                                                                                                                                    | 5,228          |                | (2,568) |  | 6,133 |  | (3,194) |  |
| Change in accumulated gains (losses) on cash flow hedge derivative financial instruments, net activity                                                                                                                                                                                                                                                                                                                                                                  | (10,244)       |                | 3,889 |  | (10,987) |  | 4,732 |  |
| Reclassification adjustment for net losses on cash flow hedge derivative financial instruments, pretax activity                                                                                                                                                                                                                                                                                                                                                         | 13,782         | [1]            | 17,160 |  | 27,467 | [1] | 34,561 |  |
| Reclassification adjustment for net losses on cash flow hedge derivative financial instruments, tax effect                                                                                                                                                                                                                                                                                                                                                              | (4,657)        | [1]            | (6,824) |  | (9,839) | [1] | (14,239) |  |
| Reclassification adjustment for net losses on cash flow hedge derivative financial instruments, net activity                                                                                                                                                                                                                                                                                                                                                            | 9,125          | [1]            | 10,336 |  | 17,628 | [1] | 20,322 |  |
| Net unrealized gains (losses) on cash flow hedge derivative financial instruments, pretax activity                                                                                                                                                                                                                                                                                                                                                                      | (1,690)        |                | 23,617 |  | 10,347 |  | 42,487 |  |
| Net unrealized gains (losses) on cash flow hedge derivative financial instruments, tax effect                                                                                                                                                                                                                                                                                                                                                                           | 571            |                | (9,392) |  | (3,706) |  | (17,433) |  |
| Net unrealized gains (losses) on cash flow hedge derivative financial instruments, net activity                                                                                                                                                                                                                                                                                                                                                                         | (1,119)        |                | 14,225 |  | 6,641 |  | 25,054 |  |
| Accumulated other comprehensive income (loss), cash flow hedge derivative financial instruments, ending balance                                                                                                                                                                                                                                                                                                                                                         | (32,782)       |                | (54,120) |  | (32,782) |  | (54,120) |  |
| **Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                  |           |                |   |  |   |  |   |  |
| Accumulated other comprehensive income (loss), investment securities available-for-sale, beginning balance                                                                                                                                                                                                                                                                                                                                                              | (116,531)      |                | 96,085 |  | (199,392) |  | 160,224 |  |
| Change in unrealized gains/(losses) on investment securities available-for-sale, pretax activity                                                                                                                                                                                                                                                                                                                                                                        | 85,291         |                | (383,087) |  | 2,651,973 |  | (415,895) |  |
| Change in unrealized gains/(losses) on investment securities available-for-sale, tax effect                                                                                                                                                                                                                                                                                                                                                                             | (33,447)       |                | 149,370 |  | (1,039,069) |  | 162,388 |  |
| Change in unrealized gains/(losses) on investment securities available-for-sale, net activity                                                                                                                                                                                                                                                                                                                                                                           | 51,844         |                | (233,717) |  | 1,612,904 |  | (253,507) |  |
| Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, pretax activity                                                                                                                                                                                                                                                                                                                                                       | (9,405)        | [2]            | (22,673) | [2] | (2,439,888) | [2] | (96,195) | [2] |
| Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, tax effect                                                                                                                                                                                                                                                                                                                                                            | 3,688          | [2]            | 8,841 | [2] | 955,972 | [2] | 38,014 | [2] |
| Reclassification adjustment for net gains (losses) included in net income on non-OTTI securities, net activity                                                                                                                                                                                                                                                                                                                                                          | (5,717)        | [2]            | (13,832) | [2] | (1,483,916) | [2] | (58,181) | [2] |
| Reclassification adjustment for net gains included in net income on OTTI securities, pretax activity                                                                                                                                                                                                                                                                                                                                                                    |           |                | 63,630 | [3] |   |  | 63,630 | [3] |
| Reclassification adjustment for net gains included in net income on OTTI securities, tax effect                                                                                                                                                                                                                                                                                                                                                                         |           |                | (24,810) | [3] |   |  | (24,810) | [3] |
| Reclassification adjustment for net gains included in net income on OTTI securities, net activity                                                                                                                                                                                                                                                                                                                                                                       |           |                | 38,820 | [3] |   |  | 38,820 | [3] |
| Total reclassification adjustment for net gains included in net income, pretax activity                                                                                                                                                                                                                                                                                                                                                                                 |           |                | 40,957 |  |   |  | (32,565) |  |
| Total reclassification adjustment for net gains included in net income, tax effect                                                                                                                                                                                                                                                                                                                                                                                      |           |                | (15,969) |  |   |  | 13,204 |  |
| Total reclassification adjustment for net gains included in net income, net activity                                                                                                                                                                                                                                                                                                                                                                                    |           |                | 24,988 |  |   |  | (19,361) |  |
| Net unrealized gains/(losses) on investment securities available-for-sale, pretax activity                                                                                                                                                                                                                                                                                                                                                                              | 75,886         |                | (342,130) |  | 212,085 |  | (448,460) |  |
| Net unrealized gains/(losses) on investment securities available-for-sale, tax effect                                                                                                                                                                                                                                                                                                                                                                                   | (29,759)       |                | 133,401 |  | (83,097) |  | 175,592 |  |
| Net unrealized gains/(losses) on investment securities available-for-sale, net activity                                                                                                                                                                                                                                                                                                                                                                                 | 46,127         |                | (208,729) |  | 128,988 |  | (272,868) |  |
| Accumulated other comprehensive income (loss), investment securities available-for-sale, ending balance                                                                                                                                                                                                                                                                                                                                                                 | (70,404)       |                | (112,644) |  | (70,404) |  | (112,644) |  |
| **Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Roll Forward]**                                                                                                                                                                                                                                                                                                                                            |           |                |   |  |   |  |   |  |
| Accumulated other comprehensive income (loss), defined benefit plans, beginning balance                                                                                                                                                                                                                                                                                                                                                                                 | (14,991)       | [3]            | (26,167) |  | (15,553) | [3] | (26,716) |  |
| Pension and post-retirement actuarial gain/(loss), pretax activity                                                                                                                                                                                                                                                                                                                                                                                                      | 447            | [3]            | 904 |  | 894 | [3] | 1,808 |  |
| Pension and post-retirement actuarial gain/(loss), tax effect                                                                                                                                                                                                                                                                                                                                                                                                           | (174)          | [3]            | (355) |  | (59) | [3] | (710) |  |
| Pension and post-retirement actuarial gain/(loss), net activity                                                                                                                                                                                                                                                                                                                                                                                                         | 273            | [3]            | 549 |  | 835 | [3] | 1,098 |  |
| Accumulated other comprehensive income (loss), defined benefit plans, ending balance                                                                                                                                                                                                                                                                                                                                                                                    | (14,718)       | [3]            | (25,618) |  | (14,718) | [3] | (25,618) |  |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                            |           |                |   |  |   |  |   |  |
| Accumulated other comprehensive income (loss), beginning balance                                                                                                                                                                                                                                                                                                                                                                                                        | (163,185)      |                | 1,573 |  | (254,368) |  | 54,334 |  |
| Other comprehensive income (loss), pretax activity                                                                                                                                                                                                                                                                                                                                                                                                                      | 74,643         |                | (317,609) |  | 223,326 |  | (404,165) |  |
| Other comprehensive income (loss), tax effect                                                                                                                                                                                                                                                                                                                                                                                                                           | (29,362)       |                | 123,654 |  | (86,862) |  | 157,449 |  |
| TOTAL OTHER COMPREHENSIVE (LOSS)/INCOME                                                                                                                                                                                                                                                                                                                                                                                                                                 | 45,281         |                | (193,955) |  | 136,464 |  | (246,716) |  |
| Accumulated other comprehensive income (loss), ending balance                                                                                                                                                                                                                                                                                                                                                                                                           | $ (117,904)    |                | $ (192,382) |  | $ (117,904) |  | $ (192,382) |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| [1]Net losses reclassified into Interest on borrowings and other debt obligations in the Condensed Consolidated Statement of Operations for settlements of interest rate swap contracts designated as cash flow hedges.[2]Net gains reclassified into Net gain on sale of investment securities sales in the Condensed Consolidated Statement of Operations for the sale of available-for-sale securities.[3]Included in the computation of net periodic pension costs. |

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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, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.
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| - Definition
The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.
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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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| - Definition
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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