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Subsequent Events (Details) - Forecast [Member]	12 Months Ended
	Dec. 31, 2021
Subsequent Events (Details) [Line Items]
Percentage of interchange fees	0.60%
Percentage of debit cards	1.48%
Percentage of credit cards	1.04%

X

- Definition

Percentage of credit cards.

+ References

No definition available.

+ Details

Name:	bsac_PercentageOfCreditCards
Namespace Prefix:	bsac_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of debit cards.

+ References

No definition available.

+ Details

Name:	bsac_PercentageOfDebitCards
Namespace Prefix:	bsac_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of interchange fees.

+ References

No definition available.

+ Details

Name:	bsac_PercentageOfInterchangeFees
Namespace Prefix:	bsac_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: