| **DERIVATIVES**                                                         | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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| **Derivative Instruments and Hedging Activities Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| DERIVATIVES                                                             | DERIVATIVESGeneralThe Company uses derivative financial instruments primarily to help manage exposure to interest rate, foreign exchange, equity and credit risk, as well as to reduce the effects that changes in interest rates may have on net income, the fair value of assets and liabilities, and cash flows. The Company also enters into derivatives with customers to facilitate their risk management activities. The Company uses derivative financial instruments as risk management tools and not for speculative trading purposes. The fair value of all derivative balances is recorded within Other assets and Other liabilities on the Condensed Consolidated Balance Sheet. See Note 16 for discussion of the valuation methodology for derivative instruments. Derivatives represent contracts between parties that usually require little or no initial net investment and result in one party delivering cash or another type of asset to the other party based on a notional amount and an underlying as specified in the contract. Derivative transactions are often measured in terms of notional amount, but this amount is generally not exchanged and is not recorded on the balance sheet. The notional amount is the basis to which the underlying is applied to determine required payments under the derivative contract. The underlying is a referenced interest rate (commonly Overnight Indexed Swap rate ("OIS") or LIBOR), security price, credit spread or other index. Derivative balances are presented on a gross basis taking into consideration the effects of legally enforceable master netting agreements. The Company’s capital markets and mortgage banking activities are subject to price risk. The Company employs various tools to measure and manage price risk in its portfolios. In addition, the Board of Directors has established certain limits relative to positions and activities. The level of price risk exposure at any given time depends on the market environment and expectations of future price and market movements and will vary from period to period.  NOTE 11. DERIVATIVES (continued)Credit Risk Contingent FeaturesThe Company has entered into certain derivative contracts that require the posting of collateral to counterparties when these contracts are in a net liability position. The amount of collateral to be posted is based on the amount of the net liability and thresholds generally related to the Company's long-term senior unsecured credit ratings. In a limited number of instances, counterparties also have the right to terminate their International Swaps and Derivatives Association, Inc. ("ISDA") master agreements if the Company's ratings fall below investment grade. As of March 31, 2016, derivatives in this category had a fair value of $1.0 million. The credit ratings of the Company and Bank are currently considered investment grade. The Company estimates as of March 31, 2016 that a further 1- or 2- notch downgrade by either Standard & Poor's ("S&P") or Moody's would require the Company to post up to an additional $2.8 million or $3.2 million of collateral, respectively, to comply with existing derivative agreements. As of March 31, 2016 and December 31, 2015, the aggregate fair value of all derivative contracts with credit risk contingent features (i.e. those containing collateral posting or termination provisions based on the Company's ratings) that were in a net liability position totaled $126.3 million and $128.1 million, respectively. The Company had $127.6 million and $128.8 million in cash and securities collateral posted to cover those positions as of March 31, 2016 and December 31, 2015, respectively.Fair Value HedgesThe Company enters into cross-currency swaps to hedge its foreign currency exchange risk on certain Euro-denominated investments. The Company also entered into interest rate swaps to hedge the interest rate risk on certain fixed rate investments. These derivatives are designated as fair value hedges at inception. The Company includes all components of each derivative's gain or loss in the assessment of hedge effectiveness. The earnings impact of the ineffective portion of these hedges was not material for the three-month periods endedMarch 31, 2016 and 2015. The last of the hedges is scheduled to expire in June 2020.Cash Flow HedgesManagement uses derivative instruments, which are designated as hedges, to mitigate the impact of interest rate movements on the fair value of certain liabilities, assets and on highly probable forecasted cash flows. These instruments primarily include interest rate swaps that have underlying interest rates based on key benchmark indices and forward sale or purchase commitments. The nature and volume of the derivative instruments used to manage interest rate risk depend on the level and type of assets and liabilities on the balance sheet and the risk management strategies for the current and anticipated interest rate environment.Interest rate swaps are generally used to convert fixed-rate assets and liabilities to variable rate assets and liabilities and vice versa. The Company utilizes interest rate swaps that have a high degree of correlation to the related financial instrument.The last of the hedges is scheduled to expire in December 2030. The Company includes all components of each derivative's gain or loss in the assessment of hedge effectiveness. The earnings impact of the ineffective portion of these hedges was not material for the three-month periods endedMarch 31, 2016 and 2015. As of March 31, 2016, the Company expects no gross losses recorded in accumulated other comprehensive loss to be reclassified to earnings during the subsequent twelve months as the future cash flows occur.  NOTE 11. DERIVATIVES (continued)Derivatives Designated in Hedge Relationships – Notional and Fair Values  Derivatives designated as accounting hedges at March 31, 2016 and December 31, 2015 included: NotionalAmount Asset Liability Weighted Average ReceiveRate Weighted Average PayRate Weighted Average  Life(Years) (dollars in thousands)March 31, 2016           Fair value hedges:           Interest rate swaps$351,000 $804 $7,247 1.38% 2.22% 3.22Cash flow hedges:           Pay fixed — receive floating interest rate swaps11,926,299 189 94,576 0.46% 1.12% 2.92Total$12,277,299 $993 $101,823 0.49% 1.15% 2.93            December 31, 2015           Fair Value hedges:           Cross-currency swaps$16,390 $3,695 $92 4.76% 4.75% 0.11    Interest 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 See Note 13 for detail of the amounts included in accumulated other comprehensive income related to derivatives activity. Cross-currency swaps designated as hedges matured during the first quarter of 2016.Other Derivative ActivitiesThe Company also enters into derivatives that are not designated as accounting hedges under GAAP. The majority of these derivatives are customer-related derivatives relating to foreign exchange and lending arrangements, as well as derivatives to hedge interest rate risk on SC secured structured financings and the borrowings under its revolving credit facilities. SC uses both interest rate swaps and interest rate caps to satisfy these requirements and to hedge the variability of cash flows on securities issued by securitization trusts and borrowings under its warehouse facilities. In addition, derivatives are used to manage risks related to residential and commercial mortgage banking and investing activities. Although these derivatives are used to hedge risk and are considered economic hedges, they are not designated as accounting hedges because the contracts they are hedging are typically also carried at fair value on the balance sheet, resulting in generally symmetrical accounting treatment for the hedging instrument and the hedged item.Mortgage Banking Derivatives The Company's derivatives portfolio includes mortgage banking interest rate lock commitments, forward sale commitments and interest rate swaps. As part of its overall business strategy, the Company originates fixed-rate residential mortgages. It sells a portion of this production to the FHLMC, FNMA, and private investors. The Company uses forward sales as a means of hedging against the economic impact of changes in interest rates on the mortgages that are originated for sale and on interest rate lock commitments.NOTE 11. DERIVATIVES (continued)The Company typically retains the servicing rights related to residential mortgage loans that are sold. Residential MSRs are accounted for at fair value. As deemed appropriate, the Company economically hedges MSRs using interest rate swaps and forward contracts to purchase MBS. Customer-related derivatives The Company offers derivatives to its customers in connection with their risk management needs. These financial derivative transactions primarily consist of interest rate swaps, caps, floors and foreign exchange contracts. Risk exposure from customer positions is managed through transactions with other dealers, including Santander. Other derivative activities The Company uses foreign exchange contracts to manage the foreign exchange risk associated with certain foreign currency-denominated assets and liabilities. Foreign exchange contracts, which include spot and forward contracts as well as cross-currency swaps, represent agreements to exchange the currency of one country for the currency of another country at an agreed-upon price on an agreed-upon settlement date. Exposure to gains and losses on these contracts will increase or decrease over their respective lives as currency exchange and interest rates fluctuate.Other derivative instruments primarily include forward contracts related to certain investment securities sales, an OIS, a total return swap on Visa, Inc. Class B common shares, and equity options, which manage the Company's market risk associated with certain investments and customer deposit products. Derivatives Not Designated in Hedge Relationships – Notional and Fair Values Other derivative activities at March 31, 2016 and December 31, 2015 included: Notional Asset derivativesFair value Liability derivativesFair value March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 (in thousands)Mortgage banking derivatives:           Forward commitments to sell loans$506,374 $396,518 $— $542 $3,371 $—Interest rate lock commitments349,468 187,930 6,992 2,540 — —Mortgage servicing435,000 435,000 14,916 679 2,669 3,502Total mortgage banking risk management1,290,842 1,019,448 21,908 3,761 6,040 3,502            Customer related derivatives:           Swaps receive fixed9,067,978 9,060,134 351,336 205,397 114 6,023Swaps pay fixed9,291,483 9,273,627 316 16,183 311,595 177,114Other2,852,757 3,035,085 50,076 53,418 49,148 52,502Total customer related derivatives21,212,218 21,368,846 401,728 274,998 360,857 235,639            Other derivative activities:           Foreign exchange contracts2,619,226 2,513,305 33,604 30,262 33,263 30,144Interest rate swap agreements1,984,000 2,399,000 — 1,176 6,580 2,481Interest rate cap agreements9,159,361 10,013,912 13,716 32,950 — —Options for interest rate cap agreements9,159,361 10,013,912 — — 13,785 32,977Other1,009,210 899,394 16,565 11,146 19,423 14,553Total$46,434,218 $48,227,817 $487,521 $354,293 $439,948 $319,296NOTE 11. DERIVATIVES (continued)Gains (Losses) on All DerivativesThe following Condensed Consolidated Statement of Operations line items were impacted by the Company’s derivative activities for the three-month periods endedMarch 31, 2016 and 2015:    Three-Month PeriodEnded March 31, Derivative Activity Line Item 2016 2015    (in thousands)Fair value hedges:      Cross-currency swaps Miscellaneous income $174 $(36)Interest rate swaps Miscellaneous income (4,484) (2,993)Cash flow hedges:      Pay fixed-receive variable interestrate swaps Net interest income (2,663) (4,451)Other derivative activities:      Forward commitments to sell loans Mortgage banking income (3,912) (187)Interest rate lock commitments Mortgage banking income 4,452 3,937Mortgage servicing Mortgage banking income 15,070 (1,219)Customer related derivatives Miscellaneous income 1,510 418Foreign exchange Miscellaneous income 223 (874)SC non-hedging derivatives Miscellaneous income (5,499) (2,397) Net interest income 15,139 18,044Other Miscellaneous income (1,131) (1,445)Disclosures about Offsetting Assets and LiabilitiesThe Company enters into legally enforceable master netting agreements, which reduce risk by permitting netting of transactions with the same counterparty on the occurrence of certain events. A master netting agreement allows two counterparties the ability to net-settle amounts under all contracts, including any related collateral posted, through a single payment and in a single currency. The right to offset and certain terms regarding the collateral process, such as valuation, credit events and settlement, are contained in the ISDA master agreement. The Company's financial instruments, including resell and repurchase agreements, securities lending arrangements, derivatives and cash collateral, may be eligible for offset on its Condensed Consolidated Balance Sheet. The Company has elected to present derivative balances on a gross basis even if the derivative is subject to a legally enforceable master netting ISDA agreements for all trades executed after April 1, 2013. Collateral that is received or pledged for these transactions is disclosed within the “Gross amounts not offset in the Condensed Consolidated Balance Sheet” section of the tables below. Prior to April 1, 2013, the Company had elected to net all caps, floors, and interest rate swaps when it had an ISDA agreement with the counterparty. The collateral received or pledged in connection with these transactions is disclosed within the “Gross amounts offset in the Condensed Consolidated Balance Sheet" section of the tables below. NOTE 11. DERIVATIVES (continued)Information about financial assets and liabilities that are eligible for offset on the Condensed Consolidated Balance Sheet as of March 31, 2016 and December 31, 2015, respectively, is presented in the following tables:  Offsetting of Financial Assets         Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet  Gross Amounts of Recognized Assets Gross Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amount  (in thousands)March 31, 2016            Fair value hedges $804 $— $804 $— $— $804Cash flow hedges 189 — 189 — — 189Other derivative activities(1) 480,529 6,781 473,748 8,024 2,786 462,938Total derivatives subject to a master netting arrangement or similar arrangement 481,522 6,781 474,741 8,024 2,786 463,931Total derivatives not subject to a master netting arrangement or similar arrangement(2) 6,992 — 6,992 — — 6,992Total Derivative Assets $488,514 $6,781 $481,733 $8,024 $2,786 $470,923             Total Financial Assets  $488,514 $6,781 $481,733 $8,024 $2,786 $470,923             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(1)Includes customer-related and other derivatives(2)Includes mortgage banking derivativesNOTE 11. DERIVATIVES (continued)  Offsetting of Financial Liabilities        Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet  Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet Financial Instruments Cash Collateral Pledged Net Amount  (in thousands)March 31, 2016            Fair value hedges $7,247 $— $7,247 $111 $11,732 $(4,596)Cash flow hedges 94,576 — 94,576 — 107,011 (12,435)Other derivative activities(1) 439,268 96,925 342,343 3,054 269,200 70,089Total derivatives subject to a master netting arrangement or similar arrangement 541,091 96,925 444,166 3,165 387,943 53,058Total derivatives not subject to a master netting arrangement or similar arrangement(2) 680 — 680 — — 680Total Derivative Liabilities  $541,771 $96,925 $444,846 $3,165 $387,943 $53,738             Total Financial Liabilities $541,771 $96,925 $444,846 $3,165 $387,943 $53,738             December 31, 2015            Fair value hedges $2,098 $— $2,098 $87 $10,602 $(8,591)Cash flow hedges 23,047 5,589 17,458 — 33,799 (16,341)Other derivative activities(1) 319,296 111,190 208,106 4,265 174,849 28,992Total derivatives subject to a master netting arrangement or similar arrangement 344,441 116,779 227,662 4,352 219,250 4,060Total derivatives not subject to a master netting arrangement or similar arrangement(2) — — — — — —Total Derivative Liabilities  $344,441 $116,779 $227,662 $4,352 $219,250 $4,060             Total Financial Liabilities $344,441 $116,779 $227,662 $4,352 $219,250 $4,060(1)Includes customer-related and other derivatives(2)Includes mortgage banking derivatives |

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The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.
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