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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4)	12 Months Ended
	Dec. 31, 2018
Consumer Loans With Or Without Collateral [Member]
Disclosure of financial assets [line items]
Term	6 months
Other Transactions Without Collateral [Member]
Disclosure of financial assets [line items]
Term	24 months
Commercial Loans With Collateral [Member]
Disclosure of financial assets [line items]
Term	36 months
Mortgage Loans [Member]
Disclosure of financial assets [line items]
Term	48 months
Consumer Leasing [Member]
Disclosure of financial assets [line items]
Term	6 months
Other Non-Mortgage Leasing Transactions [Member]
Disclosure of financial assets [line items]
Term	12 months
Mortgage Leasing (Household And Business) [Member]
Disclosure of financial assets [line items]
Term	36 months

X

- Definition

Represent information about the term of loan.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=bsac_OtherTransactionsWithoutCollateralMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=bsac_CommercialLoansWithCollateralMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=bsac_MortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=bsac_ConsumerLeasingMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=bsac_OtherNonMortgageLeasingTransactionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=bsac_MortgageLeasingHouseholdAndBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: