| **FAIR VALUE (Fair Value of Financial Instruments) (Details) (USD $)**                                                                                                                                                                                                                                                          | Mar. 31, 2015                                                                                                                                                     | Dec. 31, 2014 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |                                                                                                                                                              |               |   |  |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        | $ 18,429,023,000us-gaap_AvailableForSaleSecurities                                                                                                                |               | $ 15,908,078,000us-gaap_AvailableForSaleSecurities |  |
| Trading securities                                                                                                                                                                                                                                                                                                              | 0us-gaap_TradingSecurities                                                                                                                                        |               | 833,936,000us-gaap_TradingSecurities |  |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  | 76,026,925,000us-gaap_LoansAndLeasesReceivableNetReportedAmount                                                                                                   |               | 73,923,745,000us-gaap_LoansAndLeasesReceivableNetReportedAmount |  |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       | 135,452,000us-gaap_ServicingAssetAtFairValueAmount                                                                                                                |               | 145,047,000us-gaap_ServicingAssetAtFairValueAmount |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 451,267,000us-gaap_DerivativeAssets                                                                                                                               |               | 366,061,000us-gaap_DerivativeAssets |  |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |                                                                                                                                                              |               |   |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 338,481,000us-gaap_DerivativeLiabilities                                                                                                                          |               | 353,882,000us-gaap_DerivativeLiabilities |  |
| Restricted cash                                                                                                                                                                                                                                                                                                                 | 2,801,427,000us-gaap_RestrictedCashAndCashEquivalents                                                                                                             | [1]           | 2,024,838,000us-gaap_RestrictedCashAndCashEquivalents | [1] |
| Level 1 [Member]                                                                                                                                                                                                                                                                                                                |                                                                                                                                                              |               |   |  |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |                                                                                                                                                              |               |   |  |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               | 1,929,006,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member               |               | 2,234,725,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        | 10,475,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                 |               | 10,343,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Trading securities                                                                                                                                                                                                                                                                                                              |                                                                                                                                                              |               | 0us-gaap_TradingSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  | 3,896,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                   |               | 0us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             | 0us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                 |               | 0us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Restricted cash                                                                                                                                                                                                                                                                                                                 | 2,801,427,000sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                           |               | 2,024,838,000sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       | 0us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                     |               | 0us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 0us-gaap_DerivativeAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                                    |               | 0us-gaap_DerivativeAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |                                                                                                                                                              |               |   |  |
| Deposits                                                                                                                                                                                                                                                                                                                        | 45,931,421,000us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                            |               | 45,162,698,000us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           | 0us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                             |               | 0us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 0us-gaap_DerivativeLiabilities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member                                               |               | 0us-gaap_DerivativeLiabilities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel1Member |  |
| Level 2 [Member]                                                                                                                                                                                                                                                                                                                |                                                                                                                                                              |               |   |  |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |                                                                                                                                                              |               |   |  |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               | 0us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                           |               | 0us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        | 16,904,031,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                             |               | 14,630,092,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Trading securities                                                                                                                                                                                                                                                                                                              |                                                                                                                                                              |               | 833,936,000us-gaap_TradingSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  | 92,017,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                  |               | 101,218,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             | 1,418,646,000us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                     |               | 260,251,000us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Restricted cash                                                                                                                                                                                                                                                                                                                 | 0sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                       |               | 0sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       | 0us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                     |               | 0us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 456,644,000us-gaap_DerivativeAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                          |               | 384,100,000us-gaap_DerivativeAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |                                                                                                                                                              |               |   |  |
| Deposits                                                                                                                                                                                                                                                                                                                        | 8,474,701,000us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                             |               | 7,344,649,000us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           | 31,853,477,000us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                |               | 30,355,610,000us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 478,553,000us-gaap_DerivativeLiabilities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member                                     |               | 374,636,000us-gaap_DerivativeLiabilities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel2Member |  |
| Level 3 [Member]                                                                                                                                                                                                                                                                                                                |                                                                                                                                                              |               |   |  |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |                                                                                                                                                              |               |   |  |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               | 0us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                           |               | 0us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        | 1,514,517,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                              |               | 1,267,643,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Trading securities                                                                                                                                                                                                                                                                                                              |                                                                                                                                                              |               | 0us-gaap_TradingSecurities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  | 75,397,123,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member              |               | 74,164,351,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             | 0us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                 |               | 0us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Restricted cash                                                                                                                                                                                                                                                                                                                 | 0sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                       |               | 0sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       | 135,452,000us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                           |               | 145,047,000us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 7,022,000us-gaap_DerivativeAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                            |               | 3,070,000us-gaap_DerivativeAssets/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |                                                                                                                                                              |               |   |  |
| Deposits                                                                                                                                                                                                                                                                                                                        | 0us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                         |               | 0us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           | 11,413,550,000us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                |               | 9,792,327,000us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 385,000us-gaap_DerivativeLiabilities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member                                         |               | 355,000us-gaap_DerivativeLiabilities/ us-gaap_FairValueByFairValueHierarchyLevelAxis= us-gaap_FairValueInputsLevel3Member |  |
| Carrying Value [Member]                                                                                                                                                                                                                                                                                                         |                                                                                                                                                              |               |   |  |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |                                                                                                                                                              |               |   |  |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               | 1,929,006,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember  |               | 2,234,725,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        | 18,429,023,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                |               | 15,908,078,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Trading securities                                                                                                                                                                                                                                                                                                              |                                                                                                                                                              |               | 833,936,000us-gaap_TradingSecurities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  | 76,026,925,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |               | 73,923,745,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             | 1,361,895,000us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember        |               | 260,252,000us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Restricted cash                                                                                                                                                                                                                                                                                                                 | 2,801,427,000sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember              |               | 2,024,838,000sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       | 135,452,000us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember              |               | 145,047,000us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 463,666,000us-gaap_DerivativeAssets/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                             |               | 387,170,000us-gaap_DerivativeAssets/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |                                                                                                                                                              |               |   |  |
| Deposits                                                                                                                                                                                                                                                                                                                        | 54,368,932,000us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember               |               | 52,474,007,000us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           | 42,813,441,000us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                   |               | 39,709,653,000us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 478,938,000us-gaap_DerivativeLiabilities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember                        |               | 374,991,000us-gaap_DerivativeLiabilities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |
| Fair Value [Member]                                                                                                                                                                                                                                                                                                             |                                                                                                                                                              |               |   |  |
| **Financial assets:**                                                                                                                                                                                                                                                                                                           |                                                                                                                                                              |               |   |  |
| Cash and amounts due from depository institutions                                                                                                                                                                                                                                                                               | 1,929,006,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember     |               | 2,234,725,000us-gaap_CashAndCashEquivalentsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Available-for-sale investment securities                                                                                                                                                                                                                                                                                        | 18,429,023,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember                   |               | 15,908,078,000us-gaap_AvailableForSaleSecurities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Trading securities                                                                                                                                                                                                                                                                                                              |                                                                                                                                                              |               | 833,936,000us-gaap_TradingSecurities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Loans held for investment, net                                                                                                                                                                                                                                                                                                  | 75,493,036,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember    |               | 74,265,569,000us-gaap_LoansAndLeasesReceivableNetReportedAmount/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Loans held-for-sale                                                                                                                                                                                                                                                                                                             | 1,418,646,000us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember           |               | 260,251,000us-gaap_LoansHeldForSaleFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Restricted cash                                                                                                                                                                                                                                                                                                                 | 2,801,427,000sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember                 |               | 2,024,838,000sov_RestrictedCashFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Mortgage servicing rights                                                                                                                                                                                                                                                                                                       | 135,452,000us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember                 |               | 145,047,000us-gaap_ServicingAssetAtFairValueAmount/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | 463,666,000us-gaap_DerivativeAssets/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember                                |               | 387,170,000us-gaap_DerivativeAssets/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| **Financial liabilities:**                                                                                                                                                                                                                                                                                                      |                                                                                                                                                              |               |   |  |
| Deposits                                                                                                                                                                                                                                                                                                                        | 54,406,122,000us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember                  |               | 52,507,347,000us-gaap_DepositsFairValueDisclosure/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Borrowings and other debt obligations                                                                                                                                                                                                                                                                                           | 43,267,027,000us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember                      |               | 40,147,937,000us-gaap_DebtInstrumentFairValue/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
| Derivatives                                                                                                                                                                                                                                                                                                                     | $ 478,938,000us-gaap_DerivativeLiabilities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember                         |               | $ 374,991,000us-gaap_DerivativeLiabilities/ us-gaap_FairValueByMeasurementBasisAxis= us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |
|                                                                                                                                                                                                                                                                                                                                 |
| [1]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 7 to these Condensed Consolidated Financial Statements for additional information. |

| X                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Restricted cash, fair value disclosure
+ References
No definition available.
+ Details**Name:**sov_RestrictedCashFairValueDisclosure**Namespace Prefix:**sov_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.
+ References
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| - Definition
Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.
+ 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
Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.
+ References
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