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Equity - Treasury shares and Retained earnings (Details)
R$ / shares in Units, R$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 29, 2017
Apr. 28, 2017
shares
Nov. 30, 2017
Dec. 31, 2018
BRL (R$)
R$ / shares
shares
Dec. 31, 2017
BRL (R$)
R$ / shares
shares
Treasury shares, number of shares          
Balance, beginning of the year       13,842,004 17,545,658
Shares sold       (1,800,000) (1,800,000)
Shares canceled         (1,912,532)
Repurchase of shares         8,878
Balance, end of the year       12,042,004 13,842,004
Treasury shares, value          
Balance, beginning of the year | R$       R$ 241,088 R$ 273,665
Shares sold | R$       (22,823) (15,552)
Shares canceled | R$         (17,107)
Repurchase of shares | R$         82
Balance, end of the year | R$       R$ 218,265 R$ 241,088
Average price per share (in R$/share)          
Balance, beginning of the year | R$ / shares       R$ 17.42 R$ 15.60
Shares sold | R$ / shares       12.68 8.64
Shares canceled | R$ / shares         8.94
Shares repurchased | R$ / shares         9.24
Balance, end of the year | R$ / shares       R$ 18.13 R$ 17.42
Conversion ratio 1   1    
Capital reserves          
Average price per share (in R$/share)          
Percentage of net income transferred to reserves       90.00%  
Special statutory reserve          
Average price per share (in R$/share)          
Percentage of net income transferred to reserves       10.00%  
Ordinary          
Treasury shares, number of shares          
Balance, beginning of the year       13,842,004 6,786,194
Shares sold       (1,800,000)  
Shares transferred         7,055,810
Balance, end of the year       12,042,004 13,842,004
Pref. A          
Treasury shares, number of shares          
Balance, beginning of the year         8,846,932
Shares sold         (1,800,000)
Shares transferred         (7,055,810)
Repurchase of shares         8,878
Pref. B          
Treasury shares, number of shares          
Balance, beginning of the year         1,912,532
Shares canceled   (1,912,532)     (1,912,532)