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5. Risk Management (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings R$ 8,713,260 R$ 8,690,984
TR    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [1] 1,574,564 1,535,030
CDI    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [2] 1,144,391 1,082,228
TJLP    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [3] 1,354,987 1,326,631
IPCA    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [4] 1,699,747 1,697,452
LIBOR    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [5] 2,814,399 2,906,999
Interest and charges    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings R$ 125,172 R$ 142,644
[1] TR - Interest Benchmark Rate
[2] CDI - (Certificado de Deposito Interbancario), an interbank deposit certificate
[3] TJLP - (Taxa de Juros a Longo Prazo), a long-term interest rate index
[4] IPCA - (Indice Nacional de Precos ao Consumidor Amplo), a consumer price index
[5] LIBOR - London Interbank Offered Rate