| **DERIVATIVES (As Restated) (Tables)**                                                | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| **Derivative [Line Items]**                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Impact of Derivative Activities in the Condensed Consolidated Statement of Operations | The following Consolidated Statement of Operations line items were impacted by the Company’s derivative activities for the years endedDecember 31, 2015, 2014 and 2013:    Year Ended December 31,Derivative Activity(1) Accounts 2015 2014 2013    (in thousands)Fair value hedges:        Cross-currency swaps Miscellaneous income $62 $777 $1,700Interest rate swaps Miscellaneous income (1,412) (547) —Cash flow hedges:        Pay fixed-receive variable interestrate swaps Net interest income (11,595) (53,112) (65,900)Other derivative activities:        Forward commitments to sell loans Mortgage banking income 2,965 (4,525) 5,500Interest rate lock commitments Mortgage banking income (522) 2,516 (14,900)Mortgage servicing Mortgage banking income (2,806) (5,683) 6,500Customer related derivatives Miscellaneous income 3,191 9,605 17,200Foreign exchange Miscellaneous income (2,525) 805 (1,000)SC non-hedging derivatives Miscellaneous income 11,913 30,330 — Net interest income 78,640 (5,226) — Other administrative expenses (10,973) (7,856) —Other Miscellaneous income (1,129) (906) 700 Net interest income — — 3,100                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Offsetting Assets                                                                     | Information about financial assets and liabilities that are eligible for offset on the Consolidated Balance Sheet as of December 31, 2015 and December 31, 2014, respectively, is presented in the following tables:  Offsetting of Financial Assets         Gross Amounts Not Offset in the Consolidated Balance Sheet  Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Assets Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amount  (in thousands)December 31, 2015            Fair value hedges $3,742 $— $3,742 $— $— $3,742Cash flow hedges 7,295 — 7,295 — — 7,295Other derivative activities(1) 351,761 10,161 341,600 8,008 16,424 317,168Total derivatives subject to a master netting arrangement or similar arrangement 362,798 10,161 352,637 8,008 16,424 328,205Total derivatives not subject to a master netting arrangement or similar arrangement(2) 2,532 — 2,532 — — 2,532Total Derivative Assets $365,330 $10,161 $355,169 $8,008 $16,424 $330,737             Total Financial Assets  $365,330 $10,161 $355,169 $8,008 $16,424 $330,737             December 31, 2014            Fair value hedges $2,943 $— $2,943 $— $— $2,943Cash flow hedges 7,619 — 7,619 — — 7,619Other derivative activities(1) 373,545 21,109 352,436 10,020 5,940 336,476Total derivatives subject to a master netting arrangement or similar arrangement 384,107 21,109 362,998 10,020 5,940 347,038Total derivatives not subject to a master netting arrangement or similar arrangement(2) 3,063 — 3,063 — — 3,063Total Derivative Assets $387,170 $21,109 $366,061 $10,020 $5,940 $350,101             Total Financial Assets  $387,170 $21,109 $366,061 $10,020 $5,940 $350,101(1)Includes customer-related and other derivatives(2)Includes mortgage banking derivatives |
| Offsetting Liabilities                                                                |   Offsetting of Financial Liabilities        Gross Amounts Not Offset in the Consolidated Balance Sheet  Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Consolidated Balance Sheet Financial Instruments Cash Collateral Pledged Net Amount  (in thousands)December 31, 2015            Fair value hedges $2,098 $— $2,098 $87 $10,602 $(8,591)Cash flow hedges 23,047 — 23,047 — 39,388 (16,341)Other derivative activities(1) 319,296 77,734 241,562 4,265 208,305 28,992Total derivatives subject to a master netting arrangement or similar arrangement 344,441 77,734 266,707 4,352 258,295 4,060Total derivatives not subject to a master netting arrangement or similar arrangement(2) 53,432 — 53,432 — — 53,432Total Derivative Liabilities  $397,873 $77,734 $320,139 $4,352 $258,295 $57,492             Total Financial Liabilities $397,873 $77,734 $320,139 $4,352 $258,295 $57,492             December 31, 2014            Fair value hedges $1,759 $— $1,759 $65 $5,589 $(3,895)Cash flow hedges 20,552 — 20,552 7,341 16,797 (3,586)Other derivative activities(1) 350,863 21,109 329,754 49,318 198,103 82,333Total derivatives subject to a master netting arrangement or similar arrangement 373,174 21,109 352,065 56,724 220,489 74,852Total derivatives not subject to a master netting arrangement or similar arrangement(2) 50,710 — 50,710 — 1,736 48,974Total Derivative Liabilities  $423,884 $21,109 $402,775 $56,724 $222,225 $123,826             Total Financial Liabilities $423,884 $21,109 $402,775 $56,724 $222,225 $123,826(1)Includes customer-related and other derivatives(2)Includes mortgage banking derivatives                                                                                                                                                                                         |
| Designated as hedging instrument                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| **Derivative [Line Items]**                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Schedule of Derivative Instruments                                                    | Derivatives designated as accounting hedges at December 31, 2015 and December 31, 2014 included: NotionalAmount Asset Liability Weighted Average ReceiveRate Weighted Average PayRate Weighted Average  Life(Years) (dollars in thousands)December 31, 2015           Fair value hedges:           Cross-currency swaps$16,390 $3,695 $92 4.76% 4.75% 0.11Interest rate swaps318,000 47 2,006 1.07% 2.31% 3.50Cash flow hedges:           Pay fixed — receive floating interest rate swaps11,030,431 7,295 23,047 0.32% 1.13% 3.00Total$11,364,821 $11,037 $25,145 0.35% 1.17% 3.01            December 31, 2014           Fair Value hedges:           Cross-currency swaps$18,230 $2,711 $980 4.76% 4.75% 1.11    Interest rate swaps257,000 232 779 0.90% 2.38% 4.33Cash flow hedges:           Pay fixed — receive floating interest rate swaps10,086,103 7,619 20,552 0.17% 1.11% 3.02Total$10,361,333 $10,562 $22,311 0.19% 1.14% 3.05                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Not designated as hedging instrument                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| **Derivative [Line Items]**                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Schedule of Other Derivative Activities                                               | Other derivative activities at December 31, 2015 and December 31, 2014 included: Notional Asset derivativesFair value Liability derivativesFair value December 31, 2015 December 31, 2014 December 31, 2015 December 31, 2014 December 31, 2015 December 31, 2014 (in thousands)Mortgage banking derivatives:           Forward commitments to sell loans$396,518 $328,757 $542 $— $— $2,424Interest rate lock commitments187,930 163,013 2,540 3,063 — —Mortgage servicing435,000 469,000 679 7,432 3,502 7,448Total mortgage banking risk management1,019,448 960,770 3,761 10,495 3,502 9,872            Customer related derivatives:           Swaps receive fixed9,060,134 7,927,522 205,397 213,415 6,023 4,343Swaps pay fixed9,273,627 7,944,247 16,183 13,361 177,114 186,732Other3,035,085 1,670,696 53,418 62,464 52,502 61,880Total customer related derivatives21,368,846 17,542,465 274,998 289,240 235,639 252,955            Other derivative activities:           Foreign exchange contracts2,513,305 1,152,125 30,262 20,033 30,144 17,390Interest rate swap agreements2,399,000 3,231,000 1,176 535 2,481 12,743Interest rate cap agreements10,013,912 7,541,385 32,950 49,762 — —Options for interest rate cap agreements10,013,912 7,541,385 — — 32,977 49,806Total return settlement1,404,726 1,404,726 — — 53,432 48,893Other899,394 646,321 11,146 6,543 14,553 9,914Total$49,632,543 $40,020,177 $354,293 $376,608 $372,728 $401,573                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |

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| - Definition
Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments.
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Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.
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| - Definition
Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.
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