Document And Entity Information	12 Months Ended
	Dec. 31, 2020 shares
Document Information Line Items
Entity Registrant Name	BANCO SANTANDER CHILE
Document Type	20-F
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding	0
Amendment Flag	false
Entity Central Index Key	0001027552
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Annual Report	true
Document Shell Company Report	false
Document Transition Report	false
Entity File Number	1-14554
Entity Incorporation, State or Country Code	F3
Entity Interactive Data Current	Yes