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Other administrative expenses (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Administrative Expense [Abstract]      
Outsourced services R$ (4,748,308) R$ (4,871,194) R$ (4,139,058)
Communication (1,684,153) (1,653,055) (1,427,685)
Data processing (2,117,085) (1,612,454) (1,222,433)
Advertising and marketing (942,851) (1,124,659) (963,308)
Asset maintenance (1,158,840) (1,060,856) (926,001)
Financial system (1,033,017) (1,047,618) (830,199)
Rental (1,142,166) (1,027,561) (887,412)
Security and surveillance (818,221) (736,547) (606,292)
Transport (782,444) (719,842) (631,085)
Water, electricity and gas (405,515) (384,069) (339,267)
Advances to FGC (Deposit Guarantee Association) (418,670) (355,540) (303,094)
Supplies (263,527) (321,509) (315,135)
Travel (261,911) (174,772) (157,723)
Other (1,105,753) (1,059,887) (973,278)
Total R$ (16,882,461) R$ (16,149,563) R$ (13,721,970)