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LOANS AND ACCOUNTS RECEIVABLE FROM CUSTOMERS and INTERBANK LOANS (under IAS 39) (Details 10) - CLP ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of financial assets [line items] |  |
Total | $ 509,305 | $ 529,345
Consumer Loans [Member] |  |
Disclosure of financial assets [line items] |  |
Total | 508,998 | 526,293
Interbank Loans [Member] |  |
Disclosure of financial assets [line items] |  |
Total | $ 307 | $ 3,052

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- Definition Represent information about allowances of credits granted to customers and banks. + References No definition available. + Details
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Namespace Prefix: | bsac_
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Balance Type: | credit
Period Type: | instant

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- 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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bsac_InterbankLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |