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Pension Plans - Expected Yields (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plans [Abstract] |  |  |
Type of expected yield from the plan’s assets | 0.0250 | 0.0250 | 0.0250
Type of yield expected from the reimbursement rights | 0.0250 | 0.0250 | 0.0250

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- Definition Pension Plans [Abstract] + References No definition available. + Details
Name: | bsac_PensionPlansAbstract
Namespace Prefix: | bsac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Type Of Expected Yield From Plan Assets + References No definition available. + Details
Name: | bsac_TypeOfExpectedYieldFromPlanAssets
Namespace Prefix: | bsac_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition Represent information about the type of expected yield from the reimbursement rights. + References No definition available. + Details
Name: | bsac_TypeOfExpectedYieldFromReimbursementRights
Namespace Prefix: | bsac_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration