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v3.19.3.a.u2

Expected Credit Losses Allowance (Details 2) $ in Millions | 12 Months Ended
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Dec. 31, 2017 CLP ($)
Expected Credit Losses Allowance [Abstract] |
Charge-off of loans | $ 51,978
Provision applied | (36,279)
Net charge offs of individually significant loans | $ 15,699

X
- 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