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Risk Management (Details 28) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gains/(losses) due to the changes in fair value, including the realized and unrealized gains and losses, recorded in the statement of income      
Net gains/(losses) due to changes in fair value R$ (10,099) R$ (3,363) R$ 9,420
Total (10,099) (3,363) 9,420
Financial assets held for trading      
Gains/(losses) due to the changes in fair value, including the realized and unrealized gains and losses, recorded in the statement of income      
Net gains/(losses) due to changes in fair value (10,099) (3,363) 9,420
Total R$ (10,099) R$ (3,363) R$ 9,420