Risk Management (Details) - Schedule of Allowance and Exposure at Default (Ead) of the Loans - CLP ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Disclosure of risk management strategy related to hedge accounting [abstract]
Loans and account receivable	$ 429,995	$ 382,737
ECL allowance calculated on an individual basis	151,682	165,935
Loans and account receivable (commercial, mortgage and consumer loans)	40,502,885	40,941,107
Allowance for ECL – collective basis	$ 1,070,776	$ 1,026,755

The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets]

No definition available.

Name:	bsac_LoansAndAccountReceivable
Namespace Prefix:	bsac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant