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Significant Events - Narrative (Details) $ / shares in Units, $ / shares in Units, CLF in Millions, $ in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended |
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Jul. 12, 2024 CLP ($) | Jul. 01, 2024 CLP ($) | Apr. 17, 2024 CLP ($) $ / shares | Apr. 17, 2024 USD ($) | Apr. 01, 2024 CLP ($) operation | Dec. 31, 2024 CLP ($) shares | Sep. 30, 2024 CLP ($) shares | Aug. 31, 2024 | May 31, 2024 appoint director | Dec. 31, 2024 CLP ($) | Dec. 31, 2024 CLP ($) | Dec. 31, 2024 CLP ($) | Dec. 31, 2024 CLF | Dec. 31, 2023 CLP ($) | Dec. 31, 2023 CLP ($) $ / shares | Dec. 31, 2022 CLP ($) | Jun. 30, 2024 CLP ($)
Significant Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution and payment of dividends, percentage |  |  | 70.00% | 70.00% |  |  |  |  |  | 70.00% | 60.00% |  |  | 70.00% |  |  |
Shareholders dividend per share (in Pesos per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.84393687 |  |
Profits used to increase the banks reserves |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |
Minimum dividend provision of accumulated earnings |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |
Dividends recognised as distributions to owners |  |  | $ 347,483 | $ 496,404 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of authority to appoint | appoint |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Number of board directors | director |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Proceeds from sales of interests in associates |  |  |  |  |  |  |  |  |  |  |  | $ 1,140 |  | $ 1,643 |  | $ 18,690 |
Repayment of loans to Central Bank of Chile |  | $ (2,850,919) |  |  | $ 3,331,198 |  |  |  |  |  |  | 6,048,867 |  | (464,784) |  | $ 27,356 |
Registered senior bonds | CLF |  |  |  |  |  |  |  |  |  |  |  |  | CLF 11 |  |  |  |
Exchange process for nominal amounts |  |  |  |  |  | $ 220,811,161 |  |  |  | $ 220,811,161 | $ 220,811,161 | $ 220,811,161 |  | $ 272,064,708 | $ 272,064,708 |  |
Dividends paid, ordinary shares per share | $ / shares |  |  | $ 1.84393687 |  |  |  |  |  |  |  |  |  |  |  |  |  |
BTP25, BTU25, BTP26 And BTU26 Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange process for nominal amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,320,000
Sociedad Operadora de la Cámara de Compensación de Pagos de Alto Valor S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in transaction (in shares) | shares |  |  |  |  |  |  | 45 |  |  |  |  |  |  |  |  |  |
Proceeds from sales of interests in associates |  |  |  |  |  |  | $ 36 |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  |  |  | 13.72% | 14.27% |  |  |  |  |  |  |  |  |
Servicios Financieros Mundo Crédito SpA | Santander Consumer Finance Limitada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operations acquired | operation |  |  |  |  | 7,092 |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  | $ 49,455 |  |  |  |  |  |  |  |  |  |  |  |
Financial assets recognised as of acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,557
Credit risk loan loss provision associated with the acquired portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,820
Increase in loan portfolio | $ 14,636 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bansa Santander S.A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets as a percentage of consolidated assets |  |  |  |  |  |  |  |  | 0.40% |  |  |  |  |  |  |  |
Equity as a percentage of consolidated equity |  |  |  |  |  |  |  |  | 0.70% |  |  |  |  |  |  |  |
Earnings as a percentage of consolidated earnings |  |  |  |  |  |  |  |  | 0.40% |  |  |  |  |  |  |  |
Klare Corredora de Seguros S.A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold in transaction (in shares) | shares |  |  |  |  |  | 501 |  |  |  |  |  |  |  |  |  |  |
Sale of proportion of ownership interest in subsidiary |  |  |  |  |  | 50.01% |  |  |  |  |  |  |  |  |  |  |

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