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Risk Management (Details 11) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
By Economic Activity Sector [Abstract]      
Public sector R$ 9,676,927 R$ 8,813,581  
Public sector % 2.60% 2.20%  
Oil, derivatives and aggregate activities R$ 9,410,382 R$ 8,813,581  
Oil, derivatives and aggregate activities % 2.50% 2.20%  
Production and distribution of electricity R$ 1,322 R$ 0  
Production and distribution of electricity % 0.00% 0.00%  
Other industries R$ 265,223 R$ 0  
Other industries % 0.10% 0.00%  
Private sector R$ 364,136,738 R$ 383,270,292  
Private sector % 97.40% 97.80%  
Companies R$ 190,148,345 R$ 212,344,421  
Companies % 50.90% 54.20%  
Real estate and construction activities R$ 29,383,442 R$ 33,888,418  
Real estate and construction activities % 7.90% 8.60%  
Retail R$ 23,935,638 R$ 25,346,471  
Retail % 6.40% 6.50%  
Services R$ 17,996,533 R$ 18,172,147  
Services % 4.80% 4.60%  
Transportation and concession R$ 14,190,284 R$ 17,044,780  
Transportation and concession % 3.80% 4.30%  
Automotive R$ 10,014,454 R$ 13,148,526  
Automotive % 2.70% 3.40%  
Food products R$ 8,866,028 R$ 10,870,635  
Food products % 2.40% 2.80%  
Wholesale R$ 9,045,916 R$ 10,704,646  
Wholesale % 2.40% 2.70%  
Production and distribution of electricity R$ 7,360,804 R$ 8,255,265  
Production and distribution of electricity % 2.00% 2.10%  
Siderurgy and metallurgy R$ 7,001,290 R$ 7,800,237  
Siderurgy and metallurgy % 1.90% 2.00%  
Sugar and alcohol R$ 7,042,811 R$ 7,514,693  
Sugar and alcohol % 1.90% 1.90%  
Other industries R$ 55,311,145 R$ 59,598,603  
Other industries % 14.80% 15.20%  
Individuals R$ 173,988,393 R$ 170,925,871  
Individuals % 46.50% 43.60%  
Total Portfolio R$ 373,813,665 R$ 392,083,873  
Total portfolio % 100.00% 100.00%  
Impairment of loans and advances R$ (27,055,566) R$ (24,780,839) R$ (25,455,204)
Total of net loans and advances to customers [1] R$ 346,758,099 R$ 367,303,034  
[1] Amounts of loans and receivables are presented net of the provision for impairment losses.