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Other assets (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other assets [Abstract]      
Foreign exchange transactions [1],[2] R$ 17,279,327 R$ 17,455,821  
Debtors for guarantee deposits [1],[3] 17,840,698 16,372,044  
Negotiation and intermediation of securities [1] 1,741,524 1,954,484  
Trade and credit receivables [1] 3,016,225 1,813,144  
Deferred acquisition cost (insurance) - Note 35f 1,070,108 1,750,244 R$ 1,945,238
Other debtors 3,736,743 2,781,206  
Prepaid expenses 1,244,602 1,324,362  
Income receivable [1] 1,841,709 1,575,698  
Interbank and interdepartmental accounts 1,480,291 949,730  
Other [4] 1,602,760 1,193,637  
Total R$ 50,853,987 R$ 47,170,370  
[1] Financial assets are recorded at amortized cost.
[2] Mainly refers to purchases in foreign currency made by the institution on behalf of customers and rights in the institution's domestic currency, resulting from exchange sale operations;
[3] Refers to deposits resulting from legal or contractual requirements, including guarantees provided in cash, such as those made for the filing of appeals in departments or courts and those made to guarantee services of any nature;
[4] Includes basically trade and credit receivables, material supplies, other advances and payments to be reimbursed; and