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RISK MANAGEMENT (Details 15) - Credit Risk [Member] - CLP ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of financial assets [line items] |  |
Total | $ 24,368,176 | $ 21,770,452
Normal Portfolio [Member] | Properties/Mortgages [Member] |  |
Disclosure of financial assets [line items] |  |
Total | 22,047,354 | 19,508,151
Normal Portfolio [Member] | Investments & Others [Member] |  |
Disclosure of financial assets [line items] |  |
Total | 2,200,776 | 2,108,962
Impaired Portfolio [Member] | Properties/Mortgages [Member] |  |
Disclosure of financial assets [line items] |  |
Total | 119,181 | 152,252
Impaired Portfolio [Member] | Investments & Others [Member] |  |
Disclosure of financial assets [line items] |  |
Total | $ 865 | $ 1,087

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- Definition The amount of collateral held as security and other credit enhancements, and their financial effect (for example, a quantification of the extent to which collateral and other credit enhancements mitigate credit risk) in respect of the amount that best represents the maximum exposure to credit risk. + References No definition available. + Details
Name: | bsac_CollateralHeldAsSecurityAndOtherCreditEnhancements
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis=ifrs-full_FinancialInstrumentsNotCreditimpairedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bsac_PropertiesAndMortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bsac_InvestmentsAndOthersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |