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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2024
CLP ($)
Dec. 31, 2023
CLP ($)
Dec. 31, 2023
USD ($)
Summary of Significant Accounting Policies [Line Items]      
Percentage of inflation 4.40% 4.80% 4.80%
Revenue of operating segments, percentage 10.00%    
Profit or loss, percentage 10.00%    
Percentage of combined assets operating segments 10.00%    
Foreign exchange rate $ 992 $ 884.59 $ 860
Average incremental interest rate 1.44%    
Useful life measured as period of time, intangible assets other than goodwill 36 months    
PD equal percentage 100.00%    
Average cost to sale, percentage 5.67% 5.80% 5.80%
Net income, percentage 30.00%    
Terms of employee benefits 60 years    
Expected Credit Losses      
Summary of Significant Accounting Policies [Line Items]      
PD equal percentage 100.00%    
CLF      
Summary of Significant Accounting Policies [Line Items]      
Foreign exchange rate 38,416.69 36,789.36 36,789.36
Banco Santander Spain | Banco Santander-Chile      
Summary of Significant Accounting Policies [Line Items]      
Proportion of ownership interest in subsidiary 99.80%    
Banco Santander Spain | Teatinos Siglo XXi inversiones Ltda      
Summary of Significant Accounting Policies [Line Items]      
Proportion of ownership interest in subsidiary 100.00%    
Banco Santander Spain | Santander-Chile Bank      
Summary of Significant Accounting Policies [Line Items]      
Proportion of ownership interest in subsidiary 67.18%