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Risk Management (Details 29) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Impact on income | Scenario 1    
Sensitivity analysis for financial assets classified as Level 3    
Interest rate R$ (8) R$ (1)
Equities (1,351)  
Impact on income | Scenario 2    
Sensitivity analysis for financial assets classified as Level 3    
Interest rate (1,931) (271)
Equities (33,783)  
Impact on income | Scenario 3    
Sensitivity analysis for financial assets classified as Level 3    
Interest rate (3,482) (476)
Equities (67,567)  
Impact on shareholders’ equity | Scenario 1    
Sensitivity analysis for financial assets classified as Level 3    
Interest rate (63) (26)
Price indexes (10) (8)
Equities (17,825) (19,481)
Impact on shareholders’ equity | Scenario 2    
Sensitivity analysis for financial assets classified as Level 3    
Interest rate (14,873) (6,205)
Price indexes (1,269) (1,047)
Equities (445,615) (487,018)
Impact on shareholders’ equity | Scenario 3    
Sensitivity analysis for financial assets classified as Level 3    
Interest rate (26,345) (11,088)
Price indexes (2,394) (1,953)
Equities R$ (891,231) R$ (974,037)