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FINANCIAL RISK MANAGEMENT - Impaired Loans, Fair Value of Collateral, Allowances for Loan Losses (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial risks management [Line Items]        
Allowance for loan losses S/ 5,507,759 S/ 5,314,531 S/ 4,943,008 S/ 4,416,692
Financial assets impaired [member]        
Disclosure of financial risks management [Line Items]        
Impaired loans 5,819,295 5,237,455    
Fair value of collateral 3,879,208 3,190,530    
Allowance for loan losses 3,016,813 3,081,577    
Commercial loans [Member]        
Disclosure of financial risks management [Line Items]        
Allowance for loan losses     1,680,126 1,235,970
Commercial loans [Member] | Financial assets impaired [member]        
Disclosure of financial risks management [Line Items]        
Impaired loans 2,812,011 2,321,335    
Fair value of collateral 2,491,069 1,758,098    
Allowance for loan losses 982,950 1,023,771    
Residential mortgage loans [Member] | Financial assets impaired [member]        
Disclosure of financial risks management [Line Items]        
Impaired loans 994,479 959,033    
Fair value of collateral 864,473 820,291    
Allowance for loan losses 472,718 470,286    
Microbusiness loans [Member] | Financial assets impaired [member]        
Disclosure of financial risks management [Line Items]        
Impaired loans 1,253,969 1,254,526    
Fair value of collateral 330,347 422,330    
Allowance for loan losses 931,587 978,834    
Consumer loans [Member]        
Disclosure of financial risks management [Line Items]        
Allowance for loan losses     S/ 1,558,017 S/ 1,634,169
Consumer loans [Member] | Financial assets impaired [member]        
Disclosure of financial risks management [Line Items]        
Impaired loans 758,836 702,561    
Fair value of collateral 193,319 189,811    
Allowance for loan losses S/ 629,558 S/ 608,686