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BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jan. 28, 2014
Basis of Presentation and Accounting Policies [Line Items]              
FHLB Stock, par value (in usd per share) $ 100sov_FederalHomeLoanBankStockParValue     $ 100sov_FederalHomeLoanBankStockParValue      
Impaired loans, minimum commercial non-accrual loans $ 2,258,423,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance     $ 2,258,423,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance   $ 1,430,588,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance  
Period of time not resulting loan identified as impaired       90 days      
Impairment of long-lived assets 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 97,500,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 97,546,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse    
Goodwill recognized       5,476,844,000us-gaap_GoodwillAcquiredDuringPeriod      
OREO and other repossessed assets 225,200,000us-gaap_OtherRealEstateAndForeclosedAssets     225,200,000us-gaap_OtherRealEstateAndForeclosedAssets   91,700,000us-gaap_OtherRealEstateAndForeclosedAssets  
Automobiles [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       5 years      
Minimum [Member] | Office buildings [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       10 years      
Minimum [Member] | Leasehold improvements [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       10 years [1]      
Minimum [Member] | Software [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       3 years [2]      
Minimum [Member] | Furniture, fixtures and equipment [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       3 years      
Maximum [Member] | Office buildings [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       30 years      
Maximum [Member] | Leasehold improvements [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       30 years [1]      
Maximum [Member] | Software [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       5 years [2]      
Maximum [Member] | Furniture, fixtures and equipment [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Premises and equipment, useful lives       10 years      
Commercial loans and consumer loans [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Minimum days of loan payment delinquent that interest income not recognized       90 days      
Credit card receivable [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Minimum days of loan payment delinquent that interest income not recognized       180 days      
Threshold period after receipt of notification of death or bankruptcy       60 days      
Commercial loan [Member] | Minimum [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Impaired loans, minimum commercial non-accrual loans 1,000,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
    1,000,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Consumer loan [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Threshold period past due for charged-off of loans       180 days      
Consumer loans not secured by real estate [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Threshold period past due for charged-off of loans       120 days      
Auto loans [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Threshold period past due for charged-off of loans       121 days      
Retail installment contracts [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Threshold period past due for charged-off of loans       120 days      
Unsecured revolving loan [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Threshold period past due for charged-off of loans       180 days      
Term loan [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Threshold period past due for charged-off of loans       120 days      
Other Assets [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Amount reclassified to Core Deposit Intangibles and Other Intangibles           34,600,000us-gaap_PriorPeriodReclassificationAdjustment
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
 
SCUSA [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Ownership percentage before sale of stock           65.00%us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
 
Number of shares issued             13,895,243us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
Ownership percentage after sale of stock             61.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
Intangible assets recognized       $ 478,800,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
     
SCUSA [Member] | IPO [Member]              
Basis of Presentation and Accounting Policies [Line Items]              
Number of shares issued             85,242,042us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_BusinessAcquisitionAxis
= sov_ScusaMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
[1] Leasehold improvements are depreciated over the shorter of the useful lives of the assets or the remaining term of the leases. The useful life of the leasehold improvements may be extended beyond the base term of the lease contract when the lease contract includes renewal option period(s) that are reasonably assured of being exercised at the date the leasehold improvements are purchased. At no point does the depreciable life exceed the economic useful life of the leasehold improvement or the expected term of the lease contract.
[2] Standard depreciable period for software is three years. However, for larger software implementation projects, a five-year period is utilized.