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Financial assets and liabilities held for trading (Details 4) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Futures contracts | Purchases | Others    
Derivative financial instruments    
Notional amounts R$ 163,224 R$ 48,291
Asset/(liability) 162 0
Futures contracts | Purchases | In foreign currency    
Derivative financial instruments    
Notional amounts 48,376,597 27,399,904
Asset/(liability) 1,243 0
Futures contracts | Sales | Others    
Derivative financial instruments    
Notional amounts 113,772 967
Asset/(liability) (114) 0
Futures contracts | Sales | In foreign currency    
Derivative financial instruments    
Notional amounts 67,238,635 58,690,018
Asset/(liability) (1,003) 0
Futures contracts | Interest rate futures | Purchases    
Derivative financial instruments    
Notional amounts 96,081,180 111,026,397
Asset/(liability) 3,586 9,022
Futures contracts | Interest rate futures | Sales    
Derivative financial instruments    
Notional amounts 132,837,699 94,677,587
Asset/(liability) (154,188) (19,163)
Options | Purchases | Interest rates    
Derivative financial instruments    
Notional amounts 10,663,668 5,467,042
Asset/(liability) 101,214 260,565
Options | Purchases | Others    
Derivative financial instruments    
Notional amounts 443,443 27,500
Asset/(liability) 34,013 2,708
Options | Purchases | In foreign currency    
Derivative financial instruments    
Notional amounts 7,335,027 7,567,515
Asset/(liability) 605,028 57,533
Options | Sales | Interest rates    
Derivative financial instruments    
Notional amounts 9,616,129 4,755,788
Asset/(liability) (535,748) (193,768)
Options | Sales | Others    
Derivative financial instruments    
Notional amounts 228,141 0
Asset/(liability) (20,188) (6,533)
Options | Sales | In foreign currency    
Derivative financial instruments    
Notional amounts 10,274,094 2,836,294
Asset/(liability) (409,587) (62,356)
Forward operations | Purchases | Others    
Derivative financial instruments    
Notional amounts 114,020 48,911
Asset/(liability) 497,987 1,586,061
Forward operations | Purchases | In foreign currency    
Derivative financial instruments    
Notional amounts 10,372,477 16,633,033
Asset/(liability) 218,019 1,599,401
Forward operations | Sales | Others    
Derivative financial instruments    
Notional amounts 635,522 1,588,245
Asset/(liability) (147,138) (1,581,169)
Forward operations | Sales | In foreign currency    
Derivative financial instruments    
Notional amounts 14,947,271 18,036,706
Asset/(liability) (358,995) (1,088,041)
Swap contracts | Currency swaps | Liability position    
Derivative financial instruments    
Notional amounts 14,288,568 14,201,872
Asset/(liability) (1,618,035) (6,766,366)
Swap contracts | Interest rate swaps | Liability position    
Derivative financial instruments    
Notional amounts 31,454,647 36,746,464
Asset/(liability) (11,030,003) (3,718,282)
Swap contracts | Asset position | Currency swaps    
Derivative financial instruments    
Notional amounts 6,161,641 7,276,143
Asset/(liability) 1,340,538 3,645,707
Swap contracts | Asset position | Interest rate swaps    
Derivative financial instruments    
Notional amounts 56,636,856 72,297,999
Asset/(liability) R$ 11,065,095 R$ 9,799,949