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27 Right-of-use asset and lease liability (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Disclosure of quantitative information about right-of-use assets [line items]  
Additions R$ 9,353
Remeasurement Adjustment 3,884
Amortization (34,205)
Loss on disposal (4,223)
Initial adoption on end 92,831
Real Estate [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Initial adoption on beginning 57,461
Additions 2,484
Remeasurement Adjustment 914
Amortization (17,705)
Loss on disposal (2,999)
Initial adoption on end 40,155
Vehicles [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Initial adoption on beginning 57,564
Additions 2,295
Remeasurement Adjustment 2,970
Amortization (15,205)
Loss on disposal (1,224)
Initial adoption on end 46,400
Equipment [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Initial adoption on beginning 2,997
Additions 4,574
Remeasurement Adjustment
Amortization (1,295)
Loss on disposal
Initial adoption on end R$ 6,276