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Loans and Accounts Receivable at Amortised Cost (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2019 CLP ($)
Loans and Accounts Receivable at Amortised Cost (Textual)
Increase of provision for loan losses	$ 6,998

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- Definition

Increase of provision for loan losses.

+ References

No definition available.

+ Details

Name:	bsac_IncreaseOfProvisionForLoanLosses
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	bsac_LoansAndAccountsReceivableAtAmortisedCostTextualAbstract
Namespace Prefix:	bsac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration