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Cash and cash equivalents (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Cash [abstract]    
Cash and due from banks in domestic currency R$ 12,939,852 R$ 12,432,290
Cash and due from banks in foreign currency 2,088,498 2,085,650
Compulsory deposits with the Central Bank [1] 66,714,226 58,036,531
Other 375 180
Total R$ 81,742,951 R$ 72,554,651
[1] Compulsory deposits with the Brazilian Central Bank refer to a minimum balance that financial institutions must maintain at the Brazilian Central Bank based on a percentage of deposits received from third parties.