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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