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Risk Management (Details 5) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Loans and advances to customers neither past due nor impaired    
Total R$ 321,595,918 R$ 337,337,152
Low risk    
Loans and advances to customers neither past due nor impaired    
Total 309,535,667 325,170,838
Medium risk    
Loans and advances to customers neither past due nor impaired    
Total 9,895,319 10,269,218
High risk    
Loans and advances to customers neither past due nor impaired    
Total R$ 2,164,932 R$ 1,897,096