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As of December 31, 2021, the position of treasury shares was as follows: (Details)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
R$ / shares
shares
IfrsStatementLineItems [Line Items]  
Authorized quantity 4,200
Buyback Program 9 Number 2 [Member]  
IfrsStatementLineItems [Line Items]  
Board's Authorization 04/20/2018
Authorized quantity 30,391,000
Program Period From 4/20/2018 to 4/30/2018
Sale of shares 22,981,500,000
Balance in treasury 7,409,500
Buyback Program 9 Number 3 [Member]  
IfrsStatementLineItems [Line Items]  
Board's Authorization 06/21/2021
Authorized quantity 24,154,500
Program Period From 06/22/2021 to 12/22/2021
Balance in treasury 31,491,500
Average buyback price | R$ / shares R$ 21.82
Minimum buyback price | R$ / shares 20.06
Maximum buyback price | R$ / shares R$ 23.22
Number bought back | R$ R$ 24,082,000
Buyback Program 9 Number 4 [Member]  
IfrsStatementLineItems [Line Items]  
Board's Authorization 6/12/2021
Authorized quantity 30,000,000
Program Period From 12/07/2021 to 6/30/2022
Balance in treasury 45,790,000
Average buyback price | R$ / shares R$ 24.70
Minimum buyback price | R$ / shares 23.94
Maximum buyback price | R$ / shares R$ 25.45
Number bought back | R$ R$ 14,298,500