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Risk Management (Details 3) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Loans and advances to banks as rated internally by the Organization    
Loans and advances to banks R$ 32,253,205 R$ 94,845,534
Low risk    
Loans and advances to banks as rated internally by the Organization    
Loans and advances to banks 32,253,205 94,845,534
Medium risk    
Loans and advances to banks as rated internally by the Organization    
Loans and advances to banks 0 0
High risk    
Loans and advances to banks as rated internally by the Organization    
Loans and advances to banks R$ 0 R$ 0