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CONTINGENCIES AND COMMITMENTS (Details) - Contingent Loans [Member] - CLP ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of contingent liabilities in business combination [line items] |  |
Letters of credit issued | $ 223,420 | $ 201,699
Foreign letters of credit confirmed | 57,038 | 75,499
Performance guarantee | 1,954,205 | 1,823,793
Personal guarantees | 133,623 | 81,577
Total contingent liabilities | 2,368,286 | 2,182,568
Available on demand credit lines | 8,997,650 | 8,135,489
Other irrevocable credit commitments | 327,297 | 260,691
Total loan commit ment | 9,324,947 | 8,396,180
Total | $ 11,693,233 | $ 10,578,748

X
- Definition Represent information about available on demand credit lines. + References No definition available. + Details
Name: | bsac_AvailableOnDemandCreditLines
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount refers to contingents liabilities regonised loans loss allowance. + References No definition available. + Details
Name: | bsac_ContingentsLiabilitiesRegonisedLoansLossAllowance
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represent information about foreign letters of credit confirmed contractual obligations. + References No definition available. + Details
Name: | bsac_ForeignLettersOfCreditConfirmedContractualObligations
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about gross contractual obligations toissue loans. + References No definition available. + Details
Name: | bsac_GrossContractualObligationsToIssueLoans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about guarantees contractual obligations. + References No definition available. + Details
Name: | bsac_GuaranteesContractualObligations
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about letters of credit issued contractual obligations. + References No definition available. + Details
Name: | bsac_LettersOfCreditIssuedContractualObligations
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about other irrevocable credit commitments. + References No definition available. + Details
Name: | bsac_OtherIrrevocableCreditCommitments
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about personal guarantees contractual obligations. + References No definition available. + Details
Name: | bsac_PersonalGuaranteesContractualObligations
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represent information about total contractual obligations to issue loans. + References No definition available. + Details
Name: | bsac_TotalContractualObligationsToIssueLoans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=bsac_ContingentLoansContingentLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |