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RISK MANAGEMENT (Details 1) - Stage 2 [Member]
 12 Months Ended
Dec. 31, 2018
Collectively Assessed [Member] | Mortgages [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Percentage of quantitative criteria for significant increase in credit risk 45.00%
Description of quantitative criteria for significant increase in credit risk of portfolio Irregular portfolio > 30 days
Description of quantitative criteria for significant increase in credit risk of market Restructured marked for monitoring
Collectively Assessed [Member] | Other Loans [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Percentage of quantitative criteria for significant increase in credit risk 42.00%
Description of quantitative criteria for significant increase in credit risk of portfolio Irregular portfolio > 30 days
Description of quantitative criteria for significant increase in credit risk of market Restructured marked for monitoring
Collectively Assessed [Member] | Revolving Credit Cards [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Percentage of quantitative criteria for significant increase in credit risk 42.00%
Description of quantitative criteria for significant increase in credit risk of portfolio Irregular portfolio > 30 days
Description of quantitative criteria for significant increase in credit risk of market Restructured marked for monitoring
Collectively Assessed [Member] | Collectively Assessed SME [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Percentage of quantitative criteria for significant increase in credit risk 42.00%
Description of quantitative criteria for significant increase in credit risk of portfolio Irregular portfolio > 30 days
Description of quantitative criteria for significant increase in credit risk of market Restructured marked for monitoring
Individual [Member] | Individually Assessed SME [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Percentage of quantitative criteria for significant increase in credit risk 60.00%
Description of quantitative criteria for significant increase in credit risk of portfolio Irregular portfolio > 30 days
Description of quantitative criteria for significant increase in credit risk of market Restructured marked for monitoring
Description of quantitative criteria for significant increase in credit risk of client Clients that are considered to be substandard or in incompliance (pre-legal action)
Individual [Member] | Middle Market [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Percentage of quantitative criteria for significant increase in credit risk 50.00%
Description of quantitative criteria for significant increase in credit risk of portfolio Irregular portfolio > 30 days
Description of quantitative criteria for significant increase in credit risk of market Restructured marked for monitoring
Description of quantitative criteria for significant increase in credit risk of client Clients that are considered to be substandard or in incompliance (pre-legal action)
Individual [Member] | Corporate And Investment Banking [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
Description of quantitative criteria for significant increase in credit risk Santander Group criteria
Description of quantitative criteria for significant increase in credit risk of portfolio Irregular portfolio > 30 days
Description of quantitative criteria for significant increase in credit risk of market Restructured marked for monitoring
Description of quantitative criteria for significant increase in credit risk of client Clients that are considered to be substandard or in incompliance (pre-legal action)