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Financial risk management - Market risk, Sensitivity analysis (Details) - Market risk - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Scenario I | IPCA Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor R$ (3,045) R$ (3,267)
Scenario I | IGP-M Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (42) (83)
Scenario I | Fixed    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (334) (162)
Scenario I | TR Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (813) (34)
Scenario II | IPCA Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (378) (233)
Scenario II | IGP-M Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (6) (8)
Scenario II | Fixed    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (183) (30)
Scenario II | TR Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (23) (5)
Scenario III | IPCA Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (658,147) (44,207)
Scenario III | IGP-M Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (10,118) (15,804)
Scenario III | Fixed    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor (551,209) (56,739)
Scenario III | TR Coupon    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in profit or loss by increase (decrease) in risk factor R$ (226,744) R$ (9,801)