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18. Taxes recoverable/payable (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | R$ 380,703 | R$ 276,585
Income tax and social contribution |  |
SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | 361,758 | 270,614
Withholding income tax on financial investments For - IRRF |  |
SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | 6,423 | 2,606
Other federal taxes |  |
SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | R$ 12,522 | R$ 3,365

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- Definition The excess of amount paid for current tax in respect of current and prior periods over the amount due for those periods. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph n -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_n&doctype=Standard -URIDate 2018-03-16 + Details
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