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Financial risk management, objectives and policies (Details 3) - PEN (S/)
S/ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial liabilities [line items]      
Net S/ 11,865 S/ 100,680  
Discounted at the applicable interbank rates 489 69,912 S/ 124,770
Not later than one month [Member]      
Disclosure of financial liabilities [line items]      
Net  
Discounted at the applicable interbank rates  
Not later than three months [Member]      
Disclosure of financial liabilities [line items]      
Net (2,841) (2,942)  
Discounted at the applicable interbank rates (2,836) (2,933)  
Not later than one year [member]      
Disclosure of financial liabilities [line items]      
Net (13,032) (13,556)  
Discounted at the applicable interbank rates (12,885) (13,341)  
Later than one year and not later than five years [Member]      
Disclosure of financial liabilities [line items]      
Net (100,102) (105,069)  
Discounted at the applicable interbank rates (94,939) (97,541)  
Later than five years [Member]      
Disclosure of financial liabilities [line items]      
Net 127,840 222,247  
Discounted at the applicable interbank rates 111,149 183,727  
Inflows [Member]      
Disclosure of financial liabilities [line items]      
Net 139,785 259,195  
Inflows [Member] | Not later than one month [Member]      
Disclosure of financial liabilities [line items]      
Net  
Inflows [Member] | Not later than three months [Member]      
Disclosure of financial liabilities [line items]      
Net  
Inflows [Member] | Not later than one year [member]      
Disclosure of financial liabilities [line items]      
Net  
Inflows [Member] | Later than one year and not later than five years [Member]      
Disclosure of financial liabilities [line items]      
Net  
Inflows [Member] | Later than five years [Member]      
Disclosure of financial liabilities [line items]      
Net 139,785 259,195  
Outflows [Member]      
Disclosure of financial liabilities [line items]      
Net (127,920) (158,515)  
Outflows [Member] | Not later than one month [Member]      
Disclosure of financial liabilities [line items]      
Net    
Outflows [Member] | Not later than three months [Member]      
Disclosure of financial liabilities [line items]      
Net (2,841) (2,942)  
Outflows [Member] | Not later than one year [member]      
Disclosure of financial liabilities [line items]      
Net (13,032) (13,556)  
Outflows [Member] | Later than one year and not later than five years [Member]      
Disclosure of financial liabilities [line items]      
Net (100,102) (105,069)  
Outflows [Member] | Later than five years [Member]      
Disclosure of financial liabilities [line items]      
Net S/ (11,945) S/ (36,948)