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27 Right-of-use asset and lease liability (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Initial adoption on beginning R$ 92,831 R$ 118,022
Additions 103,571 9,353
Remeasurement Adjustment 1,406 3,884
Amortization (51,489) (34,205)
Loss on disposal (2,551) (4,223)
Reclassification (11,247)  
Initial adoption on end 132,521 92,831
Real Estate [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Initial adoption on beginning 40,155 57,461
Additions 5,319 2,484
Remeasurement Adjustment 75 914
Amortization (18,433) (17,705)
Loss on disposal (2,551) (2,999)
Reclassification (1,181)  
Initial adoption on end 23,384 40,155
Vehicles and Aircraft [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Initial adoption on beginning 46,400 57,564
Additions 79,455 2,295
Remeasurement Adjustment 1,331 2,970
Amortization (28,176) (15,205)
Loss on disposal (1,224)
Reclassification (8,694)  
Initial adoption on end 90,316 46,400
Equipment [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Initial adoption on beginning 6,276 2,997
Additions 18,797 4,574
Remeasurement Adjustment
Amortization 4,880 1,295
Loss on disposal  
Reclassification (1,372)  
Initial adoption on end R$ 18,821 R$ 6,276