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Deposits from customers (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deposits from customers (Tables) [Abstract]    
Demand deposits R$ 33,058,324 R$ 32,521,234
Savings deposits 103,332,697 97,088,828
Time deposits 125,617,424 103,137,867
Total R$ 262,008,445 R$ 232,747,929