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Supplemental pension plans (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
I Projected Benefit Obligations [Abstract]      
At the beginning of the year R$ 2,141,393 R$ 1,162,005  
Balance from an acquired institution 0 761,119  
Cost of service 186 (1,077) R$ (579)
Interest cost 227,980 181,595 133,385
Participant's contribution 1,197 2,831  
Actuarial gain/(loss) 144,624 182,762  
Benefit paid (192,042) (147,842)  
At the end of the year 2,323,338 2,141,393 1,162,005
(ii) Plan assets comprise:      
At the beginning of the year 2,127,872 1,047,782  
Balance from an acquired institution 0 883,858  
Expected earnings 423,546 307,728  
Contributions received:      
Employer 14,957 33,515  
Employees 1,197 2,831  
Benefits paid (192,043) (147,842)  
At the end of the year 2,375,529 2,127,872 R$ 1,047,782
(iii) Financial position:      
Plans in deficit (149,571) (130,293)  
Plans in surplus 201,762 116,772  
Net balance R$ 52,191 R$ (13,521)