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Risk Management (Details 10)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
CLP ($)
Number
USD [Member]  
Disclosure of detailed information about financial instruments [line items]  
Derivative Instruments (adjusted to market) $ 14,360
Deposits 1,400
Loans 7,650
Financial investments 0
Total Exposure $ 23,410
Credit Risk [Member] | Derivatives Contracts [Member] | UK [Member] | USD [Member] | Santander UK [Member]  
Disclosure of detailed information about financial instruments [line items]  
Classification | Number 1
Derivative Instruments (adjusted to market) $ 24,000
Deposits 2,000
Loans 0
Financial investments 0
Total Exposure $ 26,000
Credit Risk [Member] | Derivatives Contracts [Member] | Mexico | USD [Member]  
Disclosure of detailed information about financial instruments [line items]  
Classification | Number 2
Derivative Instruments (adjusted to market) $ 9,420
Deposits 40
Loans 0
Financial investments 0
Total Exposure $ 9,460
Credit Risk [Member] | Derivatives Contracts [Member] | Mexico | USD [Member] | Banco Santander Mexico [Member]  
Disclosure of detailed information about financial instruments [line items]  
Classification | Number 2
Derivative Instruments (adjusted to market) $ 9,400
Deposits 0
Loans 0
Financial investments 0
Total Exposure $ 9,400
Credit Risk [Member] | Derivatives Contracts [Member] | Banco Santander España [Member] | Spain | USD [Member]  
Disclosure of detailed information about financial instruments [line items]  
Classification | Number 1 [1]
Derivative Instruments (adjusted to market) $ 319,000 [1]
Deposits 54,800 [1]
Loans 400 [1]
Financial investments 0 [1]
Total Exposure $ 374,200 [1]
[1] The total amount of this exposure to derivative instruments must be compensated daily with collateral and, therefore, the net credit exposure is USD 0.