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Expected Credit Losses Allowance (Details) - Schedule of Allowance by Stage Recorded at Income Statements - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Allowance by Stage Recorded at Income Statements [Line Items] |  |  |
Commercial loans | $ (249,593) | $ (155,717) | $ (198,156)
Mortgage loans | (53,574) | (91,569) | (41,381)
Consumer loans | (357,647) | (206,172) | (201,859)
Contingent loans | 2,902 | 24,363 | (5,189)
Loans and account receivable at FVOCI | (1,040) | 201 | (58)
Debt at FVOCI | (188) | 78 | 529
Debt at amortised cost | 606 | (1,038) | (957)
Total | (658,534) | (429,854) | (447,071)
Recovery of loans previously charged-off | 153,944 | 107,069 | 90,577
TOTAL | (504,590) | (322,785) | (356,494)
Defaulted loans from mortgage | 89,994 | 93,614 |
Corporate | Stage 1 |  |  |
Schedule of Allowance by Stage Recorded at Income Statements [Line Items] |  |  |
Commercial loans | (3,447) | (132) | (4,325)
Mortgage loans | 0 | 0 | 0
Consumer loans | 0 | 0 | 0
Contingent loans | (696) | 1,184 | (453)
Loans and account receivable at FVOCI | (1,040) | 201 | (58)
Debt at FVOCI | (188) | 0 | 0
Debt at amortised cost | 606 | 0 | 0
Total | (4,765) | 1,253 | (4,836)
Corporate | Stage 2 |  |  |
Schedule of Allowance by Stage Recorded at Income Statements [Line Items] |  |  |
Commercial loans | (842) | 19,358 | (272)
Mortgage loans | 0 | 0 | 0
Consumer loans | 0 | 0 | 0
Contingent loans | (91) | 6,316 | 837
Loans and account receivable at FVOCI | 0 | 0 | 0
Debt at FVOCI | 0 | 0 | 0
Debt at amortised cost | 0 | 0 | 0
Total | (933) | 25,674 | 565
Corporate | Stage 3 |  |  |
Schedule of Allowance by Stage Recorded at Income Statements [Line Items] |  |  |
Commercial loans | (84,997) | (92,539) | (90,349)
Mortgage loans | 0 | 0 | 0
Consumer loans | 0 | 0 | 0
Contingent loans | 963 | (816) | (1,511)
Loans and account receivable at FVOCI | 0 | 0 | 0
Debt at FVOCI | 0 | 0 | 0
Debt at amortised cost | 0 | 0 | 0
Total | (84,034) | (93,355) | (91,860)
Others commercial | Stage 1 |  |  |
Schedule of Allowance by Stage Recorded at Income Statements [Line Items] |  |  |
Commercial loans | (9,814) | 3,898 | (8,734)
Mortgage loans | (1,515) | 4,582 | 5,010
Consumer loans | 1,347 | (29,029) | (16,234)
Contingent loans | 3,152 | 14,256 | (2,864)
Loans and account receivable at FVOCI | 0 | 0 | 0
Debt at FVOCI | 0 | 78 | 529
Debt at amortised cost | 0 | (1,038) | (957)
Total | (6,830) | (7,253) | (23,250)
Others commercial | Stage 2 |  |  |
Schedule of Allowance by Stage Recorded at Income Statements [Line Items] |  |  |
Commercial loans | (3,100) | (4,686) | (515)
Mortgage loans | (6,783) | 1,213 | 4,936
Consumer loans | (6,022) | (57,262) | (72,115)
Contingent loans | (653) | 1,834 | 231
Loans and account receivable at FVOCI | 0 | 0 | 0
Debt at FVOCI | 0 | 0 | 0
Debt at amortised cost | 0 | 0 | 0
Total | (16,558) | (58,901) | (67,463)
Others commercial | Stage 3 |  |  |
Schedule of Allowance by Stage Recorded at Income Statements [Line Items] |  |  |
Commercial loans | (147,393) | (81,616) | (93,961)
Mortgage loans | (45,276) | (97,364) | (51,327)
Consumer loans | (352,972) | (119,881) | (113,510)
Contingent loans | 227 | 1,589 | (1,429)
Loans and account receivable at FVOCI | 0 | 0 | 0
Debt at FVOCI | 0 | 0 | 0
Debt at amortised cost | 0 | 0 | 0
Total | $ (545,414) | $ (297,272) | $ (260,227)

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- Definition Amount of Expected Credit Losses Allowance. + 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 Expected Credit Loss Allowances Recovery Of Loans Previously Chargedoff + References No definition available. + Details
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Namespace Prefix: | bsac_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of expected credit loss allowances related to macro economy. + References No definition available. + Details
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- Definition Consumer loans. + References No definition available. + Details
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- Definition Loans and account receivable at FVOCI. + References No definition available. + Details
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