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Risk Management (Details 34) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Gross of reinsurance | Auto    
Reinsurance    
Reinsurance R$ (22,347) R$ (21,205)
Gross of reinsurance | RE (Elementary branch)    
Reinsurance    
Reinsurance (9,940) (10,809)
Gross of reinsurance | Life    
Reinsurance    
Reinsurance (28,146) (28,358)
Gross of reinsurance | Health    
Reinsurance    
Reinsurance (97,923) (89,907)
Net of reinsurance | Auto    
Reinsurance    
Reinsurance (22,347) (21,205)
Net of reinsurance | RE (Elementary branch)    
Reinsurance    
Reinsurance (8,893) (9,333)
Net of reinsurance | Life    
Reinsurance    
Reinsurance (28,050) (28,277)
Net of reinsurance | Health    
Reinsurance    
Reinsurance R$ (97,923) R$ (89,907)