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TIME DEPOSITS AND OTHER TIME LIABILITIES (Details) - CLP ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deposits and other demand liabilities
Checking accounts	$ 6,794,132	$ 6,272,656
Other deposits and demand accounts	709,711	590,221
Other demand liabilities	1,237,574	905,289
Total	8,741,417	7,768,166
Time deposits and other time liabilities
Time deposits	12,944,846	11,792,466
Time savings account	118,587	116,179
Other time liabilities	4,386	5,300
Total	$ 13,067,819	$ 11,913,945

X

- Definition

Represent information about balances on other demand liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Represent information about checking accounts.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

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- Definition

Represent information about other deposits and demand accounts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of balances in term savings accounts held by the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represent information about time deposits.

+ References

No definition available.

+ Details

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Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

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- Definition

The amount of balances in customers' demand deposits held by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
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Balance Type:	credit
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- Definition

The amount of balances in customers' deposit accounts held by the entity that the entity does not separately disclose in the same statement or note.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
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Namespace Prefix:	ifrs-full_
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X

- Definition

The amount of balances in customers' term deposits held by the entity.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-Paragraph 112
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
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