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Deposits from banks (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deposits from banks [Abstract]    
Demand deposits R$ 1,030,292 R$ 898,877
Interbank deposits 2,168,625 588,872
Securities sold under agreements to repurchase 233,467,544 241,978,931
Borrowings 18,521,713 22,165,415
Onlending 30,769,294 36,030,587
Total R$ 285,957,468 R$ 301,662,682