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Loans and advances to customers (Details Text) - BRL (R$) R$ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans And Advances To Customers Details Text [Abstract]
Personal credit - payroll loans	R$ 43,968,511	R$ 38,804,196

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- Definition

Loans and advances to customers (Details Text)

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- Definition

Loans and advances to customers - Personal credit - Related to payroll loans

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