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Cash and cash equivalents (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and cash equivalents [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    
Interbank investments [1] 141,025,717 166,712,307    
Other 375 180    
Total R$ 156,054,442 R$ 181,230,427 R$ 147,261,434 R$ 204,671,481
[1] Refers to operations with maturity date on the effective date of investment equal to or less than 90 days and insignificant risk of change in the fair value. Of this amount, R$ 123,691,195 thousand (2016 - R$ 84,728,590 thousand) refers to reverse repurchase agreements registered as Financial assets pledged as collateral (Note 23) and R$ 17,334,522 thousand (2016 - R$ 81,983,717 thousand) as Loans and advances to banks.