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v3.19.1

EXPECTED CREDIT LOSSESS ALLOWANCE (Details 2) - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Expected Credit Lossess Allowance |  |
Charge-off of loans | $ 51,978 | $ 47,605
Provision applied | (36,279) | (36,383)
Net charge offs of individually significant loans | $ 15,699 | $ 11,222

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- Definition Represent information about charged off individually significant loans. + References No definition available. + Details
Name: | bsac_ChargedoffIndividuallySignificantLoans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | bsac_ExpectedCreditLossessAllowanceAbstract
Namespace Prefix: | bsac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount refers to net charge offs of individually significant loans. + References No definition available. + Details
Name: | bsac_NetChargeOffsOfIndividuallySignificantLoans
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount refers to provisions and chargeoffs. + References No definition available. + Details
Name: | bsac_ProvisionsAndChargeoffs
Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration