| **BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Error Corrections) (Details) $ in Thousands**                                                                                                                                                                                                                                                                                                                                                                                                          | 3 Months Ended | 12 Months Ended |              |              |         |              |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|--------------|--------------|---------|--------------|
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| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Loans held-for-investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           |            |         | $ 81,213,607 | [1],[2] | $ 79,482,810 | [1],[2] | $ 78,505,860 |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         | (3,533,940)  | [2]     | (3,203,759)  | [2] | (2,301,238) |   |
| Loans held-for-investment, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           |            |         | 77,679,667   |         | 76,279,051   |  | 76,204,622 |   |
| TOTAL ASSETS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         | 131,098,910  |         | 127,633,001  |  | 123,425,703 |   |
| Deferred tax liabilities, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |         | 443,082      |         | 324,267      |  | 1,098,979 |   |
| TOTAL LIABILITIES                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |         | 111,356,941  |         | 108,064,048  |  | 100,496,977 |   |
| Retained earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |         | 2,376,115    |         | 2,367,925    |  | 3,933,988 |   |
| TOTAL SHUSA STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           |            |         | 17,234,110   |         | 17,141,354   |  | 18,814,669 |   |
| Noncontrolling interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         | 2,507,859    |         | 2,427,599    |  | 4,114,057 |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | $ 19,568,953   | $ 22,712,688    | $ 22,712,688 | 19,741,969   |         | 19,568,953   |  | 22,928,726 | $ 22,712,688 |
| TOTAL LIABILITIES AND STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |            |         | 131,098,910  |         | 127,633,001  |  | 123,425,703 |   |
| Total non-interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 601,635        | 579,323         |         |         |         |         |  |   |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 920,439        | 1,044,213       |         |         |         |         |  |   |   |
| NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 735,745        | 609,946         |         |         |         |         |  |   |   |
| Lease income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 434,652        | 312,310         |         |         |         |         |  |   |   |
| TOTAL FEES AND OTHER INCOME                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 575,214        | 569,766         |         |         |         |         |  |   |   |
| TOTAL NON-INTEREST INCOME                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 601,635        | 579,323         |         |         |         |         |  |   |   |
| Lease expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 293,779        | 235,883         |         |         |         |         |  |   |   |
| TOTAL GENERAL AND ADMINISTRATIVE EXPENSES                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 1,108,205      | 963,621         |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 138,745        | 192,984         |         |         |         |         |  |   |   |
| Income tax provision                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 65,010         | 40,144          |         |         |         |         |  |   |   |
| NET INCOME INCLUDING NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 73,735         | 152,840         |         |         |         |         |  |   |   |
| LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                | 61,895         | 52,324          |         |         |         |         |  |   |   |
| NET INCOME ATTRIBUTABLE TO SANTANDER HOLDINGS USA, INC.                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 11,840         | 100,516         |         |         |         |         |  |   |   |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 19,568,953     | 22,712,688      | 22,712,688   |         |         |         |  |   |   |
| Comprehensive income attributable to Santander Holdings USA, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                       | 109,122        | 152,006         |         |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 19,741,969     | 22,928,726      | 19,568,953   |         |         |         |  |   |   |
| Deferred tax expense/(benefit)                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 53,474         | (72,363)        |         |         |         |         |  |   |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         | 3,533,940    |         | 3,203,759    |  | 2,301,238 | 1,750,643 |
| Provision for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 895,828        | 1,049,213       |         |         |         |         |  |   |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         | 1,098,166    |         | 899,415      |  | 337,146 |   |
| Impaired financing receivable, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         | 5,013,456    |         | 4,542,986    |  | 3,398,375 |   |
| Impaired financing receivable, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         | 5,477,495    |         | 5,044,479    |  | 3,882,252 |   |
| Impaired financing receivables, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                             | 4,778,226      | 2,637,365       | 3,531,274    |         |         |         |  |   |   |
| Troubled debt restructurings                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         | 4,702,984    |         | 4,411,247    |  | 3,257,394 |   |
| Pre-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 793,141        | 1,156,958       |         |         |         |         |  |   |   |
| Post-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | $ (781,451)    | (1,152,222)     |         |         |         |         |  |   |   |
| Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           | $ 144,305       |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 9,782           |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 59,471         | 80,142          |         |         |         |         |  |   |   |
| Total expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | $ 1,198,635    | $ 996,285       |         |         |         |         |  |   |   |
| Retained Earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 2,367,925      | 3,837,122       | 3,837,122    | 2,376,115    |         | 2,367,925    |  | 3,933,988 | 3,837,122 |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 2,367,925      | 3,837,122       | 3,837,122    |         |         |         |  |   |   |
| Comprehensive income attributable to Santander Holdings USA, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                       | 11,840         | 100,516         |         |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2,376,115      | 3,933,988       | 2,367,925    |         |         |         |  |   |   |
| Noncontrolling Interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 2,427,599      | 4,046,922       | 4,046,922    | 2,507,859    |         | 2,427,599    |  | 4,114,057 | 4,046,922 |
| LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                | 61,895         | 52,324          |         |         |         |         |  |   |   |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 2,427,599      | 4,046,922       | 4,046,922    |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 2,507,859      | 4,114,057       | 2,427,599    |         |         |         |  |   |   |
| Commercial                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         | 526,165      |         | 433,514      |  | 398,434 | 386,837 |
| Provision for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 107,210        | 24,908          |         |         |         |         |  |   |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         | 129,304      |         | 51,743       |  | 79,032 |   |
| Impaired financing receivable, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         | 564,134      |         | 327,720      |  | 376,865 |   |
| Impaired financing receivable, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         | 631,497      |         | 415,273      |  | 458,643 |   |
| Impaired financing receivables, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                             | 445,928        | 407,028         | 361,380      |         |         |         |  |   |   |
| Consumer                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         | 2,962,447    |         | 2,724,917    |  | 1,831,505 | 1,330,782 |
| Provision for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 788,618        | 986,030         |         |         |         |         |  |   |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         | 968,862      |         | 847,672      |  | 258,114 |   |
| Impaired financing receivable, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         | 4,449,322    |         | 4,215,266    |  | 3,021,510 |   |
| Impaired financing receivable, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         | 4,845,998    |         | 4,629,206    |  | 3,423,609 |   |
| Impaired financing receivables, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                             | 4,332,298      | 2,230,337       | 3,169,894    |         |         |         |  |   |   |
| Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | $ 220,706      | $ 144,305       |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 14,796         | 9,782           |         |         |         |         |  |   |   |
| Unallocated                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         | 45,328       |         | 45,328       |  | 71,299 | 33,024 |
| Provision for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | $ 0            | $ 38,275        |         |         |         |         |  |   |   |
| Commercial and industrial loans | Commercial                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Impaired financing receivable with no related allowance recorded, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                   |           |            |         | 5,360        |         | 3,635        |  | 5,132 |   |
| Impaired financing receivable with no related allowance recorded, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                              |           |            |         | 6,636        |         | 5,046        |  | 6,433 |   |
| Impaired financing receivable with no related allowance recorded, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                           | 4,498          | 7,830           | 5,780        |         |         |         |  |   |   |
| Impaired financing receivable with related allowance recorded, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         | 310,467      |         | 113,451      |  | 81,067 |   |
| Impaired financing receivable with related allowance recorded, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         | 315,312      |         | 142,308      |  | 94,042 |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         | 108,047      |         | 38,416       |  | 38,661 |   |
| Impaired financing receivable with related allowance recorded, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                              | 211,959        | 81,636          | 88,818       |         |         |         |  |   |   |
| Pre-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 7,281          | 10,880          |         |         |         |         |  |   |   |
| Post-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | (7,280)        | (8,166)         |         |         |         |         |  |   |   |
| Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | $ 2,000        | $ 276           |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 55             | 10              |         |         |         |         |  |   |   |
| Number of Contracts                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 223            | 81              |         |         |         |         |  |   |   |
| Retail installment contracts and auto loans | Consumer                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Loans held-for-investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           |            |         | 26,849,278   |         | 25,669,232   |  |   |   |
| Impaired financing receivable with no related allowance recorded, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                   |           |            |         | 76,371       |         | 87,138       |  | 146,136 |   |
| Impaired financing receivable with no related allowance recorded, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                              |           |            |         | 96,361       |         | 110,575      |  | 189,983 |   |
| Impaired financing receivable with no related allowance recorded, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                           | $ 81,755       | $ 519,849       | 937,131      |         |         |         |  |   |   |
| Impaired financing receivable with related allowance recorded, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         | 4,026,246    |         | 3,790,551    |  | 2,586,190 |   |
| Impaired financing receivable with related allowance recorded, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         | 4,354,771    |         | 4,133,121    |  | 2,902,397 |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         | 936,010      |         | 815,226      |  | 216,586 |   |
| Impaired financing receivable with related allowance recorded, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                              | 3,908,401      | 1,307,306       | 1,923,700    |         |         |         |  |   |   |
| Pre-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 694,175        | 1,112,626       |         |         |         |         |  |   |   |
| Post-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | (693,372)      | (1,110,365)     |         |         |         |         |  |   |   |
| Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | $ 214,702      | $ 142,534       |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 13,124         | 9,693           |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 42,039         | 75,489          |         |         |         |         |  |   |   |
| Performing                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |           | $ 121,800       |         |         |         |         |  |   |   |
| Troubled debt restructurings                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         | 4,192,307    |         | 3,807,751    |  | 2,875,546 |   |
| Nonperforming                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Troubled debt restructurings                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         | 510,677      |         | 603,496      |  | 381,848 |   |
| Carrying Value                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Loans held-for-investment, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           |            |         | 77,679,667   |         | $ 76,279,051 |  | 76,204,622 |   |
| Eliminations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL ASSETS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         | 0            |         |         |  | 0 |   |
| Total non-interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | $ (11,237)     | (15,723)        |         |         |         |         |  |   |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 0              | 0               |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 3,161          | (1,960)         |         |         |         |         |  |   |   |
| Total expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | (12,937)       | (13,676)        |         |         |         |         |  |   |   |
| SC | Operating Segments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL ASSETS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         | 37,825,803   |         |         |  | 34,638,558 |   |
| Total non-interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 345,615        | 321,640         |         |         |         |         |  |   |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 706,574        | 674,688         |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 316,822        | 361,969         |         |         |         |         |  |   |   |
| Total expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 543,482        | 444,988         |         |         |         |         |  |   |   |
| SC | SC Purchase Price Adjustments                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL ASSETS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         | $ 0          |         |         |  | 0 |   |
| Total non-interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 13,782         | 59,202          |         |         |         |         |  |   |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 100,939        | 322,524         |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | (67,671)       | (182,297)       |         |         |         |         |  |   |   |
| Total expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | $ 14,733       | 13,743          |         |         |         |         |  |   |   |
| As Reported                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Loans held-for-investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           |            |         |         |         |         |  | 78,520,165 |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         |         |         |         |  | (2,493,240) |   |
| Loans held-for-investment, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           |            |         |         |         |         |  | 76,026,925 |   |
| TOTAL ASSETS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  | 123,248,006 |   |
| Deferred tax liabilities, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |         |         |         |         |  | 1,030,676 |   |
| TOTAL LIABILITIES                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |         |         |         |         |  | 100,428,674 |   |
| Retained earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |         |         |         |         |  | 3,869,581 |   |
| TOTAL SHUSA STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           |            |         |         |         |         |  | 18,750,262 |   |
| Noncontrolling interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  | 4,069,070 |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           | 22,504,095      | 22,504,095   |         |         |         |  | 22,819,332 | 22,504,095 |
| TOTAL LIABILITIES AND STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |            |         |         |         |         |  | 123,248,006 |   |
| Total non-interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 665,397         |         |         |         |         |  |   |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 872,184         |         |         |         |         |  |   |   |
| NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES                                                                                                                                                                                                                                                                                                                                                                                                                                                   |           | 781,975         |         |         |         |         |  |   |   |
| Lease income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           | 398,385         |         |         |         |         |  |   |   |
| TOTAL FEES AND OTHER INCOME                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 655,840         |         |         |         |         |  |   |   |
| TOTAL NON-INTEREST INCOME                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 665,397         |         |         |         |         |  |   |   |
| Lease expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           | 321,958         |         |         |         |         |  |   |   |
| TOTAL GENERAL AND ADMINISTRATIVE EXPENSES                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 1,049,696       |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           | 365,012         |         |         |         |         |  |   |   |
| Income tax provision                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |           | 112,973         |         |         |         |         |  |   |   |
| NET INCOME INCLUDING NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           | 252,039         |         |         |         |         |  |   |   |
| LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                |           | 93,450          |         |         |         |         |  |   |   |
| NET INCOME ATTRIBUTABLE TO SANTANDER HOLDINGS USA, INC.                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           | 158,589         |         |         |         |         |  |   |   |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 22,504,095      | 22,504,095   |         |         |         |  |   |   |
| Comprehensive income attributable to Santander Holdings USA, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                       |           | 210,079         |         |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           | 22,819,332      |         |         |         |         |  |   |   |
| Deferred tax expense/(benefit)                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 467             |         |         |         |         |  |   |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         |         |         |         |  | 2,493,240 | 2,108,817 |
| Provision for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           | 877,184         |         |         |         |         |  |   |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         |         |         |         |  | 358,747 |   |
| Impaired financing receivable, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         |         |         |         |  | 3,495,289 |   |
| Impaired financing receivable, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  | 3,989,036 |   |
| Impaired financing receivables, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 3,062,167       |         |         |         |         |  |   |   |
| Troubled debt restructurings                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  | 3,354,308 |   |
| Pre-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 1,235,487       |         |         |         |         |  |   |   |
| Post-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           | (1,173,271)     |         |         |         |         |  |   |   |
| Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           | $ 132,061       |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 13,444          |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 85,231          |         |         |         |         |  |   |   |
| Total expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | $ 1,082,360     |         |         |         |         |  |   |   |
| As Reported | Retained Earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           | 3,714,642       | 3,714,642    |         |         |         |  | 3,869,581 | 3,714,642 |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 3,714,642       | 3,714,642    |         |         |         |  |   |   |
| Comprehensive income attributable to Santander Holdings USA, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                       |           | 158,589         |         |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           | 3,869,581       |         |         |         |         |  |   |   |
| As Reported | Noncontrolling Interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           | 3,960,809       | 3,960,809    |         |         |         |  | 4,069,070 | 3,960,809 |
| LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                |           | 93,450          |         |         |         |         |  |   |   |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 3,960,809       | 3,960,809    |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           | 4,069,070       |         |         |         |         |  |   |   |
| As Reported | Commercial                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         |         |         |         |  | 408,867 | 396,489 |
| Provision for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           | 25,689          |         |         |         |         |  |   |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         |         |         |         |  | 79,474 |   |
| Impaired financing receivable, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         |         |         |         |  | 377,112 |   |
| Impaired financing receivable, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  | 458,887 |   |
| Impaired financing receivables, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 386,127         |         |         |         |         |  |   |   |
| As Reported | Consumer                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         |         |         |         |  | 2,013,074 | 1,679,304 |
| Provision for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           | 813,220         |         |         |         |         |  |   |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         |         |         |         |  | 279,273 |   |
| Impaired financing receivable, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         |         |         |         |  | 3,118,177 |   |
| Impaired financing receivable, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  | 3,530,149 |   |
| Impaired financing receivables, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 2,676,040       |         |         |         |         |  |   |   |
| As Reported | Unallocated                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         |         |         |         |  | 71,299 | 33,024 |
| Provision for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           | 38,275          |         |         |         |         |  |   |   |
| As Reported | Commercial and industrial loans | Commercial                                                                                                                                                                                                                                                                                                                                                                                                                                              |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Impaired financing receivable with no related allowance recorded, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                   |           |            |         |         |         |         |  | 3,931 |   |
| Impaired financing receivable with no related allowance recorded, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                              |           |            |         |         |         |         |  | 5,202 |   |
| Impaired financing receivable with no related allowance recorded, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                           |           | 4,979           |         |         |         |         |  |   |   |
| Impaired financing receivable with related allowance recorded, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         |         |         |         |  | 82,515 |   |
| Impaired financing receivable with related allowance recorded, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  | 95,517 |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         |         |         |         |  | 39,103 |   |
| Impaired financing receivable with related allowance recorded, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                              |           | 74,350          |         |         |         |         |  |   |   |
| Pre-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 11,477          |         |         |         |         |  |   |   |
| Post-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           | (8,448)         |         |         |         |         |  |   |   |
| Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           | $ 276           |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 10              |         |         |         |         |  |   |   |
| Number of Contracts | Contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 99              |         |         |         |         |  |   |   |
| As Reported | Retail installment contracts and auto loans | Consumer                                                                                                                                                                                                                                                                                                                                                                                                                                    |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Impaired financing receivable with no related allowance recorded, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                   |           |            |         |         |         |         |  | 151,229 |   |
| Impaired financing receivable with no related allowance recorded, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                              |           |            |         |         |         |         |  | 196,458 |   |
| Impaired financing receivable with no related allowance recorded, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                           |           | $ 149,788       |         |         |         |         |  |   |   |
| Impaired financing receivable with related allowance recorded, recorded investment                                                                                                                                                                                                                                                                                                                                                                                                                      |           |            |         |         |         |         |  | 2,677,764 |   |
| Impaired financing receivable with related allowance recorded, unpaid principal balance                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  | 3,002,462 |   |
| Impaired financing receivable, related specific reserves                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         |         |         |         |  | 237,745 |   |
| Impaired financing receivable with related allowance recorded, average recorded investment                                                                                                                                                                                                                                                                                                                                                                                                              |           | 2,241,385       |         |         |         |         |  |   |   |
| Pre-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 1,190,272       |         |         |         |         |  |   |   |
| Post-TDR Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           | (1,131,418)     |         |         |         |         |  |   |   |
| Recorded Investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           | $ 130,290       |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 13,355          |         |         |         |         |  |   |   |
| Number of Contracts | contract                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 80,560          |         |         |         |         |  |   |   |
| As Reported | Performing                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |           | $ 80,500        |         |         |         |         |  |   |   |
| Troubled debt restructurings                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  | 2,962,052 |   |
| As Reported | Nonperforming                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Troubled debt restructurings                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  | 392,256 |   |
| As Reported | Carrying Value                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Loans held-for-investment, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           |            |         |         |         |         |  | 76,026,925 |   |
| As Reported | Eliminations                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Total non-interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | (10,093)        |         |         |         |         |  |   |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 0               |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           | (1,960)         |         |         |         |         |  |   |   |
| Total expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | (8,046)         |         |         |         |         |  |   |   |
| As Reported | SC | Operating Segments                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Total non-interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 422,970         |         |         |         |         |  |   |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 605,982         |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           | 430,675         |         |         |         |         |  |   |   |
| Total expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | 546,318         |         |         |         |         |  |   |   |
| As Reported | SC | SC Purchase Price Adjustments                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Total non-interest income                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 38,317          |         |         |         |         |  |   |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 219,202         |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           | (78,975)        |         |         |         |         |  |   |   |
| Total expenses                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | (7,142)         |         |         |         |         |  |   |   |
| Corrections                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Loans held-for-investment                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           |            |         |         |         |         |  | (14,305) |   |
| Allowance for loan and lease losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |           |            |         |         |         |         |  | 192,002 |   |
| Loans held-for-investment, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           |            |         |         |         |         |  | 177,697 |   |
| TOTAL ASSETS                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  | 177,697 |   |
| Deferred tax liabilities, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |            |         |         |         |         |  | 68,303 |   |
| TOTAL LIABILITIES                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |         |         |         |         |  | 68,303 |   |
| Retained earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |           |            |         |         |         |         |  | 64,407 |   |
| TOTAL SHUSA STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           |            |         |         |         |         |  | 64,407 |   |
| Noncontrolling interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           |            |         |         |         |         |  | 44,987 |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           | 208,593         | 208,593      |         |         |         |  | 109,394 | 208,593 |
| TOTAL LIABILITIES AND STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |            |         |         |         |         |  | 177,697 |   |
| Provision for credit losses                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | 172,029         |         |         |         |         |  |   |   |
| NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES                                                                                                                                                                                                                                                                                                                                                                                                                                                   |           | (172,029)       |         |         |         |         |  |   |   |
| Lease income                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           | (86,075)        |         |         |         |         |  |   |   |
| TOTAL FEES AND OTHER INCOME                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           | (86,074)        |         |         |         |         |  |   |   |
| TOTAL NON-INTEREST INCOME                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | (86,074)        |         |         |         |         |  |   |   |
| Lease expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           | (86,075)        |         |         |         |         |  |   |   |
| TOTAL GENERAL AND ADMINISTRATIVE EXPENSES                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | (86,075)        |         |         |         |         |  |   |   |
| INCOME BEFORE INCOME TAX PROVISION                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           | (172,028)       |         |         |         |         |  |   |   |
| Income tax provision                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |           | (72,829)        |         |         |         |         |  |   |   |
| NET INCOME INCLUDING NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           | (99,199)        |         |         |         |         |  |   |   |
| LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                |           | (41,126)        |         |         |         |         |  |   |   |
| NET INCOME ATTRIBUTABLE TO SANTANDER HOLDINGS USA, INC.                                                                                                                                                                                                                                                                                                                                                                                                                                                 |           | (58,073)        |         |         |         |         |  |   |   |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 208,593         | 208,593      |         |         |         |  |   |   |
| Comprehensive income attributable to Santander Holdings USA, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                       |           | (58,073)        |         |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           | 109,394         |         |         |         |         |  |   |   |
| Deferred tax expense/(benefit)                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | (72,830)        |         |         |         |         |  |   |   |
| Corrections | Retained Earnings                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           | 122,480         | 122,480      |         |         |         |  | 64,407 | 122,480 |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 122,480         | 122,480      |         |         |         |  |   |   |
| Comprehensive income attributable to Santander Holdings USA, Inc.                                                                                                                                                                                                                                                                                                                                                                                                                                       |           | (58,073)        |         |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           | 64,407          |         |         |         |         |  |   |   |
| Corrections | Noncontrolling Interest                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| TOTAL STOCKHOLDER’S EQUITY                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           | 86,113          | 86,113       |         |         |         |  | 44,987 | $ 86,113 |
| LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST                                                                                                                                                                                                                                                                                                                                                                                                                                                |           | (41,126)        |         |         |         |         |  |   |   |
| Equity, Beginning balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 86,113          | $ 86,113     |         |         |         |  |   |   |
| Equity, Ending balance                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |           | $ 44,987        |         |         |         |         |  |   |   |
| Corrections | Carrying Value                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |           |            |         |         |         |         |  |   |   |
| **Error Corrections and Prior Period Adjustments Restatement [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                             |           |            |         |         |         |         |  |   |   |
| Loans held-for-investment, net                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           |            |         |         |         |         |  | $ 177,697 |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| [1]Loans held-for-investment includes $285.8 million and $328.7 million of loans recorded at fair value at March 31, 2016 and December 31, 2015, respectively.[2]The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. The Company consolidates VIEs where it is deemed the primary beneficiary. See Note 6 to these Condensed Consolidated Financial Statements for additional information. |

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Total fees and other income.
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Fees and Other Income Including Realized Gains (Losses) on Sale of Investment Securities
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General and administrative and other expenses
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, before jurisdictional netting.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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A valuation allowance for financing receivables that are expected to be uncollectible.
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Number of financing receivables that have been modified by troubled debt restructurings.
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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.
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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.
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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.
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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.
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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.
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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.
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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.
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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.
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Amount of allowance for credit losses related to recorded investment.
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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.
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Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.
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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.
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Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.
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Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.
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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.
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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.
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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.
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| - Definition
Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.
+ References
No definition available.
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| - Definition
Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.
+ References
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| - Definition
Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.
+ References
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| - Definition
Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.
+ References
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| - Definition
Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.
+ References
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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| - Definition
Amount of Net Income (Loss) attributable to noncontrolling interest.
+ References
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| - Definition
The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.
+ References
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| - Definition
The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.
+ References
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| - Definition
The cumulative amount of the reporting entity's undistributed earnings or deficit.
+ References
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
+ References
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| - Definition
Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.
+ References
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