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20. Employees benefits (Details 8) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | R$ 1,611,138 | R$ 1,383,694 |
Equities | 199,362 | 196,188 |
Structured investments | 113,363 | 126,303 |
Other | 7,517 | 6,366 |
Fair value of plan assets | 1,931,380 | 1,712,551 | R$ 1,586,930
NTNBs |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 1,064,935 | 997,027 |
NTNCs |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 146,495 | 141,405 |
NTNFs |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 0 | 5,803 |
Government bonds in own portfolio |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 1,211,430 | 1,144,235 |
Fixed income fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 260,352 | 95,854 |
Private credit investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 135,454 | 139,665 |
Debentures |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Fixed income | 3,902 | 3,940 |
Stocks investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Equities | 195,459 | 180,721 |
Shares |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Equities | 3,903 | 15,467 |
Equity investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Structured investments | 86,193 | 76,680 |
Real estate investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Structured investments | 27,170 | 18,428 |
Multimarket investment fund quotas |  |  |
SummaryOfEmployeeBenefitsLineItems [Line Items] |  |  |
Structured investments | R$ 0 | R$ 31,195 |

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