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5. Risk Management (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings R$ 9,218,759 R$ 8,713,260
CDI    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [1] 1,250,000 1,144,391
TR    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [2] 1,637,290 1,574,564
IPCA    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [3] 1,614,595 1,699,747
TJLP    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings [4] 1,322,854 1,354,987
LIBOR    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings 3,259,295 [5] 2,814,399
Interest and charges    
SummaryOfBorrowingsLineItems [Line Items]    
Borrowings R$ 134,725 R$ 125,172
[1] CDI - (Certificado de Deposito Interbancario), an interbank deposit certificate
[2] TR - Interest Benchmark Rate
[3] IPCA - (Indice Nacional de Precos ao Consumidor Amplo), a consumer price index
[4] TJLP - (Taxa de Juros a Longo Prazo), a long-term interest rate index
[5] LIBOR - London Interbank Offered Rate