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Commitments and contingencies - Letters fo credit - Additional information (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 PEN (S/) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of Commitments and contingencies [Line Items] |  |  |
Maximum amount of loans |  | $ 50,000,000 |
Minimum coverage ratio | 1.6 |  |
Letters of guarantee | S/ 1,780,126,238 | 140,000,000 | $ 121,400,000
Regional Governments and Others [Member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee |  | 491,000,000 |
Letters Of Credit Regional Governments And Others [Member] |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee |  | 852,000 | $ 361,000
Tax years 2008 and 2009 |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |
Letters of guarantee | S/ 653,500,000 | $ 180,300,000 |

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- References No definition available. + Details
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- Definition The amount of letter of credit drawn. + References No definition available. + Details
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- Details
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