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STOCKHOLDER'S EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Feb. 28, 2014
May 28, 2014
Sep. 30, 2014
Dec. 31, 2013
Class of Stock [Line Items]            
Proceeds from the issuance of common stock $ 1,787,285us-gaap_ProceedsFromIssuanceOfCommonStock $ 0us-gaap_ProceedsFromIssuanceOfCommonStock        
Common Stock, shares outstanding 530,391,043us-gaap_CommonStockSharesOutstanding       530,391,043us-gaap_CommonStockSharesOutstanding 520,307,043us-gaap_CommonStockSharesOutstanding
Santander [Member] | Stock Issued for Cash [Member]            
Class of Stock [Line Items]            
Issuance of common stock, shares     7,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ dei_LegalEntityAxis
= sov_SantanderMember
/ us-gaap_SubsidiarySaleOfStockAxis
= sov_StockIssuedforCashMember
     
Proceeds from the issuance of common stock     1,750,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= sov_SantanderMember
/ us-gaap_SubsidiarySaleOfStockAxis
= sov_StockIssuedforCashMember
     
Santander [Member] | Extinguishment of Debt [Member]            
Class of Stock [Line Items]            
Issuance of common stock, shares     3,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ dei_LegalEntityAxis
= sov_SantanderMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_LongTermDebtMember
     
Proceeds from the issuance of common stock     750,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= sov_SantanderMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_LongTermDebtMember
     
Banco Santander [Member]            
Class of Stock [Line Items]            
Issuance of common stock, shares         0us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Proceeds from the issuance of common stock       $ 21,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Banco Santander [Member] | Stock Issued for Cash [Member]            
Class of Stock [Line Items]            
Issuance of common stock, shares       84,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_SubsidiarySaleOfStockAxis
= sov_StockIssuedforCashMember