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LOANS AND ACCOUNTS RECEIVABLE FROM CUSTOMERS and INTERBANK LOANS (under IAS 39) (Details 1) $ in Millions | Dec. 31, 2017 CLP ($)
--- | ---
Foreign Interbank Loans [Member] |
Disclosure of financial assets [line items] |
Interbank loans | $ 162,685
Provisions and impairment for foreign bank loans | (472)
Total | 162,213
Domestic Banks [Member] |
Disclosure of financial assets [line items] |
Interbank loans |
Other domestic bank loans |

X
- Definition Amount refers to interbank loans foreign. + References No definition available. + Details
Name: | bsac_InterbankLoansForeign
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount refer to other domestic bank loans. + References No definition available. + Details
Name: | bsac_OtherDomesticBankLoans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount refers to provisions and impairment for foreign bank loans. + References No definition available. + Details
Name: | bsac_ProvisionsAndImpairmentForForeignBankLoans1
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount refers to total foreign interbank loans. + References No definition available. + Details
Name: | bsac_TotalForeignInterbankLoans
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_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | bsac_CategoriesOfLoansAndReceivablesCategoryAxis=bsac_ForeignInterbankLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bsac_CategoriesOfLoansAndReceivablesCategoryAxis=bsac_DomesticBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |