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Risk Management (Details 7) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Loans and advances to customers impaired    
Loans and advances to customers impaired R$ 41,533,433 R$ 42,133,815
Portfolio not yet due    
Loans and advances to customers impaired    
Loans and advances to customers impaired 20,342,024 17,567,703
Past due up to 60 days    
Loans and advances to customers impaired    
Loans and advances to customers impaired 2,915,081 4,067,322
Past due between 61 and 90 days    
Loans and advances to customers impaired    
Loans and advances to customers impaired 1,279,795 1,284,035
Past due for more than 90 days    
Loans and advances to customers impaired    
Loans and advances to customers impaired R$ 16,996,533 R$ 19,214,755