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Cash and cash equivalents (Details Text) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Cash and balances with banks (Details Text)    
Interbank investments [1] R$ 123,691,195 R$ 84,728,590
Loans and advances to banks    
Cash and balances with banks (Details Text)    
Interbank investments R$ 17,334,522 R$ 81,983,717
[1] Refers to reverse repurchase agreements in which the underlying security has subsequently been sold in a separate repurchase agreement.