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Financial assets available for sale (Details Text) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial Assets Available For Sale Details Text [Abstract]      
Financial instruments pledged as collateral and classified as available for sale [1] R$ 59,482,796 R$ 64,275,415  
Financial assets available for sale pledged as a guarantee for liabilities 4,391,259 5,517,516  
Net gains/(losses) on financial instruments classified as available for sale. - impairment losses R$ 1,729,039 R$ 2,106,107 R$ 424,522
[1] In 2017, includes unrealized gains of R$ 3,246,351 thousand (2016 - R$ 2,052,366 thousand) and unrealized losses of R$ 557,974 thousand (2016 - R$ 1,443,642 thousand); and