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Interest Income (Details) - Schedule of income and expense from interest - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of income and expense from interest [Abstract] |  |  |
Interest income not including income from hedge accounting | $ 2,967,933 | $ 2,233,623 | $ 2,314,637
Interest expense not including expense from hedge accounting | (707,460) | (624,314) | (866,327)
Net Interest income (expense) from hedge accounting | 2,260,473 | 1,609,309 | 1,448,310
Hedge accounting (net) | (449,122) | (15,461) | (31,346)
Total net interest income | $ 1,811,351 | $ 1,593,848 | $ 1,416,964

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- Definition Amount represents as a hedge accounting (net). + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount represents as a interest expense less expense from hedge accounting. + References No definition available. + Details
Name: | bsac_InterestExpenseLessExpenseFromHedgeAccounting
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount represents as a interest income less income from hedge accounting. + References No definition available. + Details
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Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount represents as a net Interest income (expense) from hedge accounting. + References No definition available. + Details
Name: | bsac_NetInterestIncomeExpenseFromHedgeAccounting
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | bsac_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of interest income on financial assets designated at fair value through profit or loss. [Refer: Interest income; Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration