| **LOANS AND ALLOWANCE FOR CREDIT LOSSES - Rollforward of Allowance for Credit Losses (Details) (USD $)In Thousands, unless otherwise specified**                                                                                                                                                                                                                                                                                                                                                                                                                  | 12 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Allowance for Loan Losses [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |            |  |   |  |   |  |
| Allowance for loan losses, beginning of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | $ 1,013,469     |  | $ 1,083,492 |  | $ 2,197,450 |  |
| Allowance recorded as part of loans transferred from Santander                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 0               |  | 3,712 |  | 0 |  |
| Allowance released due to SCUSA transaction                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 0               |  | 0 |  | (1,208,474) |  |
| Provision/(recovery) for loan losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 36,850          | [1],[2] | 439,285 | [1],[2] | 1,364,087 | [1],[2] |
| Charge-offs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | (315,204)       |  | (607,239) |  | (1,614,037) |  |
| Recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 99,222          |  | 94,219 |  | 344,466 |  |
| Charge-offs, net of recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | (215,982)       |  | (513,020) |  | (1,269,571) |  |
| Allowance for loan losses, end of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 834,337         |  | 1,013,469 |  | 1,083,492 |  |
| Reserve for unfunded lending commitments, beginning of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 210,000         |  | 256,485 |  | 300,621 |  |
| Addition to (Release of) provision for unfunded lending commitments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 10,000          | [1] | (46,485) | [1] | (44,136) | [1] |
| Reserve for unfunded lending commitments, end of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 220,000         |  | 210,000 |  | 256,485 |  |
| Total allowance for credit losses, end of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 1,054,337       |  | 1,223,469 |  | 1,339,977 |  |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |            |  |   |  |   |  |
| Ending balance, individually evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 225,796         |  | 267,054 |  | 252,556 |  |
| Ending balance, collectively evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 608,541         |  | 746,415 |  | 830,936 |  |
| Total Financing Receivables                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 50,050,626      | [3] | 53,232,353 | [3] | 51,659,851 |  |
| Ending balance, evaluated at fair value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 128,949         | [4] | 843,442 | [4] | 352,471 |  |
| Ending balance, individually evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 1,233,152       |  | 1,390,207 |  | 1,331,011 |  |
| Ending balance, collectively evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 48,688,525      |  | 50,998,704 |  | 49,976,369 |  |
| Commercial [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |  |   |  |   |  |
| **Allowance for Loan Losses [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |            |  |   |  |   |  |
| Allowance for loan losses, beginning of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 580,931         |  | 766,865 |  | 905,786 |  |
| Allowance recorded as part of loans transferred from Santander                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |            |  | 3,712 |  |   |  |
| Allowance released due to SCUSA transaction                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |            |  |   |  | 0 |  |
| Provision/(recovery) for loan losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | (67,472)        |  | 97,528 |  | 364,048 |  |
| Charge-offs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | (123,517)       |  | (335,114) |  | (545,028) |  |
| Recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 53,132          |  | 47,940 |  | 42,059 |  |
| Charge-offs, net of recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | (70,385)        |  | (287,174) |  | (502,969) |  |
| Allowance for loan losses, end of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 443,074         |  | 580,931 |  | 766,865 |  |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |            |  |   |  |   |  |
| Ending balance, individually evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 90,594          |  | 112,784 |  | 217,865 |  |
| Ending balance, collectively evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 352,481         |  | 468,147 |  | 549,000 |  |
| Total Financing Receivables                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 32,169,154      |  | 32,931,339 |  | 29,889,193 |  |
| Ending balance, evaluated at fair value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 17,932          |  | 0 |  | 0 |  |
| Ending balance, individually evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 479,343         |  | 633,822 |  | 836,580 |  |
| Ending balance, collectively evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 31,671,879      |  | 32,297,517 |  | 29,052,613 |  |
| Consumer [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |            |  |   |  |   |  |
| **Allowance for Loan Losses [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |            |  |   |  |   |  |
| Allowance for loan losses, beginning of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 407,259         |  | 292,816 |  | 1,275,982 |  |
| Allowance recorded as part of loans transferred from Santander                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |            |  | 0 |  |   |  |
| Allowance released due to SCUSA transaction                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |            |  |   |  | (1,208,474) |  |
| Provision/(recovery) for loan losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 101,985         |  | 340,289 |  | 991,910 |  |
| Charge-offs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | (191,687)       |  | (272,125) |  | (1,069,009) |  |
| Recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 46,090          |  | 46,279 |  | 302,407 |  |
| Charge-offs, net of recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | (145,597)       |  | (225,846) |  | (766,602) |  |
| Allowance for loan losses, end of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 363,647         |  | 407,259 |  | 292,816 |  |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |            |  |   |  |   |  |
| Ending balance, individually evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 135,202         |  | 154,270 |  | 34,691 |  |
| Ending balance, collectively evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 228,444         |  | 252,989 |  | 258,125 |  |
| Total Financing Receivables                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 17,881,472      | [3] | 20,301,014 | [3] | 21,770,658 |  |
| Ending balance, evaluated at fair value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 111,017         |  | 843,442 |  | 352,471 |  |
| Ending balance, individually evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 753,809         |  | 756,385 |  | 494,431 |  |
| Ending balance, collectively evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 17,016,646      |  | 18,701,187 |  | 20,923,756 |  |
| Consumer Loans Secured by Real Estate [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |            |  |   |  |   |  |
| **Allowance for Loan Losses [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |            |  |   |  |   |  |
| Charge-offs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | (94,651)        |  | (154,263) |  | (250,992) |  |
| Recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 14,148          |  | 8,935 |  | 8,419 |  |
| Consumer Loans not Secured by Real Estate [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |            |  |   |  |   |  |
| **Allowance for Loan Losses [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |            |  |   |  |   |  |
| Charge-offs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | (97,036)        | [2] | (117,862) | [2] | (818,017) | [2] |
| Recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 31,942          | [2] | 37,344 | [2] | 293,988 | [2] |
| Unallocated [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |            |  |   |  |   |  |
| **Allowance for Loan Losses [Roll Forward]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |            |  |   |  |   |  |
| Allowance for loan losses, beginning of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 25,279          |  | 23,811 |  | 15,682 |  |
| Allowance recorded as part of loans transferred from Santander                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |            |  | 0 |  |   |  |
| Allowance released due to SCUSA transaction                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |            |  |   |  | 0 |  |
| Provision/(recovery) for loan losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 2,337           |  | 1,468 |  | 8,129 |  |
| Charge-offs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 0               |  | 0 |  | 0 |  |
| Recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 0               |  | 0 |  | 0 |  |
| Charge-offs, net of recoveries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 0               |  | 0 |  | 0 |  |
| Allowance for loan losses, end of period                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 27,616          |  | 25,279 |  | 23,811 |  |
| **Allowance for Credit Loss, Additional Information [Abstract]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |            |  |   |  |   |  |
| Ending balance, individually evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 0               |  | 0 |  | 0 |  |
| Ending balance, collectively evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 27,616          |  | 25,279 |  | 23,811 |  |
| Total Financing Receivables                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 0               |  | 0 |  | 0 |  |
| Ending balance, evaluated at fair value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 0               |  | 0 |  | 0 |  |
| Ending balance, individually evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 0               |  | 0 |  | 0 |  |
| Ending balance, collectively evaluated for impairment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 0             |  | $ 0 |  | $ 0 |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [1]The Company defines the Provision for credit losses in the Consolidated Statement of Operations as the sum of the total provision for loan losses and provision for unfunded lending commitments.[2]On December 31, 2011, the Company deconsolidated SCUSA as a result of certain agreements with investors entered into during the fourth quarter of 2011. The activity for the years 2012 and 2013 does not include SCUSA activity.[3]Financing receivables include LHFS.[4]Amounts represent items for which the Company has elected the fair value option. |

| X                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Allowance for Loan and Lease Losses, Equity Method Investment Transaction
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible and reserve for unfunded lending commitments.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net amount of direct write-downs and recoveries of financing receivables charged against the allowance.
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| X                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables including loans held-for-sale, before allowance for credit losses.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net change in reserve for unfunded commitments which is included in the provision for credit losses.
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| X                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reserve for unfunded loan commitments and letters of credit.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of addition to allowance reserve for credit loss arising from purchase of loan and lease portfolios.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
A valuation allowance for financing receivables that are expected to be uncollectible.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.
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| - Definition
Amount of recovery of financing receivables doubtful of collection that were previously charged off.
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| - Definition
Amount of direct write-downs of financing receivables charged against the allowance.
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| - Definition
The balance of financing receivables that were collectively evaluated for impairment.
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| - Definition
The balance of financing receivables that were individually evaluated for impairment.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
+ References
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