XML 700 R258.htm IDEA: XBRL DOCUMENT v3.22.1
Commitments and contingencies - Letters fo credit - Additional information (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
PEN (S/)
Disclosure of Commitments and contingencies [Line Items]      
Maximum amount of loans $ 50,000,000    
Minimum coverage ratio 1.6    
Letters of guarantee $ 140,000,000.0 $ 155,900,000 S/ 1,780,126,238
Regional Governments and Others [Member]      
Disclosure of Commitments and contingencies [Line Items]      
Letters of guarantee 491,000,000.0    
Letters Of Credit Regional Governments And Others [Member]      
Disclosure of Commitments and contingencies [Line Items]      
Letters of guarantee 852,000 $ 1,291,000  
Tax years 2008 and 2009      
Disclosure of Commitments and contingencies [Line Items]      
Letters of guarantee $ 180,300,000   S/ 653,500,000