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Loans and advances to customers (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans and advances to customers [Abstract]      
Working capital R$ 52,700,584 R$ 60,390,890  
Personal credit [1] 60,570,146 56,255,740  
Housing loans 59,963,375 60,458,038  
Financing and export 38,272,982 41,983,307  
Onlending BNDES/Finame 30,655,666 35,816,560  
Credit card 37,568,984 37,407,733  
Vehicle loans 24,741,298 23,699,948  
Rural loans 13,642,478 14,422,799  
Import 5,318,042 7,140,346  
Overdraft for corporates 6,587,239 8,583,285  
Receivable insurance premiums 4,301,472 5,517,932  
Overdraft for individuals 3,582,020 4,209,637  
Leasing 2,249,859 2,738,611  
Other 33,659,520 33,459,047  
Total Portfolio 373,813,665 392,083,873  
Impairment of loans and advances (27,055,566) (24,780,839) R$ (25,455,204)
Total of net loans and advances to customers [2] R$ 346,758,099 R$ 367,303,034  
[1] Includes in 2017 R$ 43,968,511 thousand related to payroll loans (2016 - R$ 38,804,196 thousand).
[2] Amounts of loans and receivables are presented net of the provision for impairment losses.