| **ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (Tables)**             | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Schedule of Accumulated Other Comprehensive Income (Loss)                | The following table presents the components of accumulated other comprehensive income/ (loss), net of related tax, for the three-month and nine-month periods endedSeptember 30, 2015 and 2014, respectively.  Total OtherComprehensive Income/(Loss)Total AccumulatedOther Comprehensive (Loss)/IncomeThree-Month Period Ended September 30, 2015June 30, 2015September 30, 2015PretaxActivityTaxEffectNet ActivityBeginningBalanceNetActivityEndingBalance(in thousands)Change in accumulated (losses)/gains on cash flow hedge derivative financial instruments$(45,805)$16,975$(28,830)   Reclassification adjustment for net gains/(losses) on cash flow hedge derivative financial instruments (1)1,774(657)1,117   Net unrealized (losses)/gains on cash flow hedge derivative financial instruments(44,031)16,318(27,713)$(22,161)$(27,713)$(49,874)Change in unrealized gains/(losses) on investment securities available-for-sale135,217(52,711)82,506   Reclassification adjustment for net losses/(gains) included in net income on non-OTTI securities (2)1,993(777)1,216Net unrealized gains/(losses) on investment securities available-for-sale137,210(53,488)83,722(74,758)83,7228,964Pension and post-retirement actuarial gain/(loss) (3)1,018(398)620(28,583)620(27,963)As of September 30, 2015$94,197$(37,568)$56,629$(125,502)$56,629$(68,873)(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. NOTE 13. ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (continued) Total OtherComprehensive Income/(Loss) Total AccumulatedOther Comprehensive (Loss)/Income For the Nine-Month PeriodEnded September 30, 2015 December 31, 2014  September 30, 2015 PretaxActivity TaxEffect Net Activity BeginningBalance NetActivity EndingBalance (in thousands)Change in accumulated (losses)/gains on cash flow hedge derivative financial instruments$(67,051) $25,226 $(41,825)      Reclassification adjustment for net gains/(losses) on cash flow hedge derivative financial instruments (1)9,957 (3,746) 6,211      Net unrealized (losses)/gains on cash flow hedge derivative financial instruments(57,094) 21,480 (35,614) $(14,260) $(35,614) $(49,874)            Change in unrealized gains/(losses) on investment securities available-for-sale119,553 (47,692) 71,861      Reclassification adjustment for net (gains)/losses included in net income on non-OTTI securities (2)(18,363) 7,325 (11,038)      Reclassification adjustment for net losses/(gains) included in net income/(expense) on OTTI securities (3)1,092 (436) 656      Reclassification adjustment for net (gains)/losses included in net income (17,271) 6,889 (10,382)      Net unrealized gains/(losses) on investment securities available-for-sale102,282 (40,803) 61,479 (52,515) 61,479 8,964            Pension and post-retirement actuarial gain/(loss) (3)3,054 (1,382) 1,672 (29,635) 1,672 (27,963)            As of September 30, 2015$48,242$(20,705)$27,537$(96,410)$27,537$(68,873)(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. NOTE 13. ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (continued) Total OtherComprehensive (Loss)/Income Total AccumulatedOther Comprehensive Loss Three-Month Period Ended September 30, 2014 June 30, 2014   September 30, 2014 PretaxActivity TaxEffect Net Activity BeginningBalance NetActivity EndingBalance (in thousands)Change in accumulated gains/(losses) on cash flow hedge derivative financial instruments$13,667 $(5,018) $8,649      Reclassification adjustment for net gains/(losses) on cash flow hedge derivative financial instruments (1)13,797 (5,065) 8,732      Net unrealized gains/(losses) on cash flow hedge derivative financial instruments27,464 (10,083) 17,381 $(32,782) $17,381 $(15,401)            Change in unrealized (losses).gains on investment securities available-for-sale(28,911) 11,294 (17,617)      Reclassification adjustment for net (gains)/losses included in net income on non-OTTI securities(2)(131) 51 (80)      Net unrealized (losses)/gains on investment securities available-for-sale(29,042) 11,345 (17,697) (70,404) (17,697) (88,101)            Pension and post-retirement actuarial gain/(loss)(3)447 (175) 272 (14,718) 272 (14,446)            As of September 30, 2014$(1,131) $1,087 $(44) $(117,904) $(44) $(117,948)(1) Net losses reclassified into Interest on borrowings and other debt obligations in the Condensed Consolidated Statement of Operations for settlements of interest rate swap contracts designated as cash flow hedges. (2) Net gains reclassified into Net gain on sale of investment securities sales in the Condensed Consolidated Statement of Operations for the sale of available-for-sale securities. (3) Included in the computation of net periodic pension costs. NOTE 13. ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (continued)             Total OtherComprehensive Income/(Loss) Total AccumulatedOther Comprehensive (Loss)/Income Nine-Month Period Ended September 30, 2014 December 31, 2013   September 30, 2014 PretaxActivity TaxEffect Net Activity BeginningBalance NetActivity EndingBalance (in thousands)Change in accumulated (losses)/gains on cash flow hedge derivative financial instruments$(3,453) $1,259 $(2,194)      Reclassification adjustment for net gains/(losses) on cash flow hedge derivative financial instruments (1)41,264 (15,048) 26,216      Net unrealized gains/(losses) on cash flow hedge derivative financial instruments37,811 (13,789) 24,022 $(39,423) $24,022 $(15,401)            Change in unrealized gains/(losses) on investment securities available-for-sale2,623,062 (1,028,228) 1,594,834      Reclassification adjustment for net gains included in net (gains)/losses on non-OTTI securities(2)(2,440,019) 956,476 (1,483,543)      Net unrealized gains/(losses) on investment securities available-for-sale183,043 (71,752) 111,291 (199,392) 111,291 (88,101)            Pension and post-retirement actuarial gain/(loss)(3)1,341 (234) 1,107 (15,553) 1,107 (14,446)            As of September 30, 2014$222,195 $(85,775) $136,420 $(254,368) $136,420 $(117,948)(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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| - References
No definition available.
+ Details**Name:**us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
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| - Definition
Tabular disclosure of the components of accumulated other comprehensive income (loss).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580
+ Details**Name:**us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock**Namespace Prefix:**us-gaap_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |