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Risk Management (Details 27) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gains/(losses) due to changes in fair value, including the realized and unrealized gains and losses, recorded in the consolidated statement of income      
Interest and similar income R$ 208,236 R$ 223,682 R$ 1,840,234
Net trading gains/(losses) realized and unrealized (927,370) (1,384,752) 1,105,390
Total (719,134) (1,161,070) 2,945,624
Financial assets held for trading      
Gains/(losses) due to changes in fair value, including the realized and unrealized gains and losses, recorded in the consolidated statement of income      
Interest and similar income 25,967 16,518 440,791
Net trading gains/(losses) realized and unrealized (10,099) (3,363) 10,496
Total 15,868 13,155 451,287
Financial assets available for sale      
Gains/(losses) due to changes in fair value, including the realized and unrealized gains and losses, recorded in the consolidated statement of income      
Interest and similar income 182,269 207,164 1,399,443
Net trading gains/(losses) realized and unrealized (917,271) (1,381,389) 1,094,894
Total R$ (735,002) R$ (1,174,225) R$ 2,494,337