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Transactions With Related Parties (Details) - Schedule of loan activity to related parties - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Companies Of The Group [Member] |  |  |  |  |  |
Transactions With Related Parties (Details) - Schedule of loan activity to related parties [Line Items] |  |  |  |  |  |
Opening balances | [1] | $ 356,848 | $ 715,671 |  | $ 572,745 |
Total |  | 607,378 | 356,848 | [1] | 715,671 | [1]
Loans granted |  | 373,006 | 388,896 | [1] | 193,798 | [1]
Loans payments |  | (122,476) | (747,719) | [1] | (50,872) | [1]
Associated Companies [Member] |  |  |  |  |  |
Transactions With Related Parties (Details) - Schedule of loan activity to related parties [Line Items] |  |  |  |  |  |
Opening balances |  | 265 | 375 |  | 459 |
Total |  | 192 | 265 |  | 375 |
Loans granted |  |  |  |  | 167 |
Loans payments |  | (73) | (110) |  | (251) |
Key Personnel [Member] |  |  |  |  |  |
Transactions With Related Parties (Details) - Schedule of loan activity to related parties [Line Items] |  |  |  |  |  |
Opening balances |  | 32,498 | 29,240 |  | 33,871 |
Total |  | 29,889 | 32,498 |  | 29,240 |
Loans granted |  | 5,738 | 8,080 |  | 4,826 |
Loans payments |  | (8,347) | (4,822) |  | (9,457) |
Other [Member] |  |  |  |  |  |
Transactions With Related Parties (Details) - Schedule of loan activity to related parties [Line Items] |  |  |  |  |  |
Opening balances |  | 993 | 748 |  | 7,899 |
Total |  | 219 | 993 |  | 748 |
Loans granted |  | 53 | 727 |  | 500 |
Loans payments |  | $ (827) | $ (482) |  | $ (7,651) |
[1] | Loans with non-controlled companies (not-consolidated) amount MCh$1,174, MCh$2,286 and MCh$2,059 as of December 31, 2021, 2020 and 2019, respectively.

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- Definition Amount of loan activity as of balance sheet date. + References No definition available. + Details
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- Definition Amount of loan payment from related party during the period. + References No definition available. + Details
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Namespace Prefix: | bsac_
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Balance Type: | debit
Period Type: | duration

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- Details
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