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Derivative financial instruments and Short positions (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
"Swap"      
Trading      
Notional [1] R$ 0 R$ 0 R$ 0
Fair Value (1,431,110) 1,108,760 3,142,125
"Swap" | Liabilities      
Trading      
Notional [1] 176,385,349 199,709,355 184,350,947
Fair Value (45,918,384) (56,185,419) (21,169,360)
"Swap" | CDI (Interbank Deposit Rates) | Liabilities      
Trading      
Notional [1] 11,801,600 16,664,176 23,178,722
Fair Value 0 0 0
"Swap" | Fixed Interest Rate - Real | Liabilities      
Trading      
Notional [1] 88,317,044 114,055,076 133,185,717
Fair Value (23,075,374) (21,687,884) (17,414,147)
"Swap" | Indexed to Price and Interest Rates | Liabilities      
Trading      
Notional [1] 24,308,601 40,146,968 12,767,212
Fair Value (21,775,017) (34,107,210) (3,518,297)
"Swap" | Foreign Currency | Liabilities      
Trading      
Notional [1] 50,748,008 28,420,467 15,049,776
Fair Value 0 0 (38,836)
"Swap" | Others | Liabilities      
Trading      
Notional [1] 1,210,096 422,668 169,520
Fair Value (1,067,993) (390,325) (198,080)
"Swap" | Assets      
Trading      
Notional [1] 177,233,869 202,081,214 196,887,188
Fair Value 44,487,274 57,294,179 24,311,485
"Swap" | Assets | CDI (Interbank Deposit Rates)      
Trading      
Notional [1] 36,135,015 33,289,522 44,868,680
Fair Value 24,267,591 22,409,496 22,759,822
"Swap" | Assets | Fixed Interest Rate - Real      
Trading      
Notional [1] 47,968,999 95,700,715 126,300,261
Fair Value 0 0 0
"Swap" | Assets | Indexed to Price and Interest Rates      
Trading      
Notional [1] 2,581,215 5,592,892 9,225,789
Fair Value 0 0 0
"Swap" | Assets | Foreign Currency      
Trading      
Notional [1] 90,495,240 67,493,635 16,492,458
Fair Value 20,219,683 34,884,683 1,551,663
"Swap" | Assets | Others      
Trading      
Notional [1] 53,400 4,450 0
Fair Value 0 0 0
Options      
Trading      
Notional [1] 335,073,080 190,061,609 175,841,405
Fair Value 153,149 168,034 (230,482)
Options | Sold Position      
Trading      
Notional [1] 185,996,284 102,557,776 91,957,439
Fair Value (563,787) (385,183) (1,166,002)
Options | Call Option - US Dollar | Sold Position      
Trading      
Notional [1] 7,615,856 5,595,163 4,314,988
Fair Value (101,034) (117,059) (141,172)
Options | Put Option - US Dollar | Sold Position      
Trading      
Notional [1] 12,160,912 5,919,598 7,390,733
Fair Value (169,431) (77,145) (952,407)
Options | Call Option - Other | Sold Position      
Trading      
Notional [1] 31,679,919 19,880,180 30,441,646
Fair Value (66,002) (35,961) (46,940)
Options | Interbank Market | Sold Position      
Trading      
Notional [1] 29,609,298 19,151,110 27,597,764
Fair Value (13,195) (515) (4,087)
Options | Others | Sold Position      
Trading      
Notional [1],[2] 2,070,621 729,070 2,843,882
Fair Value [2] (52,807) (35,446) (42,853)
Options | Put Option - Other | Sold Position      
Trading      
Notional [1] 134,539,597 71,162,835 49,810,072
Fair Value (227,320) (155,018) (25,483)
Options | Interbank Market | Sold Position      
Trading      
Notional [1] 133,703,672 70,494,622 49,245,495
Fair Value (179,841) (126,743) (5,793)
Options | Others | Sold Position      
Trading      
Notional [1],[2] 835,925 668,213 564,577
Fair Value [2] (47,479) (28,275) (19,690)
Options | Purchased Position      
Trading      
Notional [1] 149,076,796 87,503,833 83,883,966
Fair Value 716,936 553,217 935,520
Options | Purchased Position | Call Option - US Dollar      
Trading      
Notional [1] 14,518,058 9,369,821 12,693,748
Fair Value 239,079 169,542 181,463
Options | Purchased Position | Put Option - US Dollar      
Trading      
Notional [1] 8,893,620 5,130,392 3,788,161
Fair Value 90,736 42,389 392,048
Options | Purchased Position | Call Option - Other      
Trading      
Notional [1] 3,118,344 1,953,481 20,115,932
Fair Value 131,297 59,220 62,517
Options | Purchased Position | Interbank Market      
Trading      
Notional [1] 639,488 1,185,310 17,391,500
Fair Value 4,537 389 7,062
Options | Purchased Position | Others      
Trading      
Notional [1],[2] 2,478,856 768,171 2,724,432
Fair Value [2] 126,760 58,831 55,455
Options | Purchased Position | Put Option - Other      
Trading      
Notional [1] 122,546,774 71,050,139 47,286,125
Fair Value 255,824 282,066 299,492
Options | Purchased Position | Interbank Market      
Trading      
Notional [1] 121,782,816 70,295,282 46,106,600
Fair Value 217,726 257,943 18,029
Options | Purchased Position | Others      
Trading      
Notional [1],[2] 763,958 754,857 1,179,525
Fair Value [2] 38,098 24,123 281,463
Future Contracts      
Trading      
Notional [1] 289,508,200 161,725,596 104,651,180
Fair Value 0 0 0
Future Contracts | Sold Position      
Trading      
Notional [1] 203,304,466 106,919,574 64,254,724
Fair Value 0 0 0
Future Contracts | Sold Position | Exchange Coupon (DDI)      
Trading      
Notional [1] 146,948,795 55,016,928 15,048,490
Fair Value 0 0 0
Future Contracts | Sold Position | Interest Rates (DI1 and DIA)      
Trading      
Notional [1] 54,160,203 51,135,994 29,047,678
Fair Value 0 0 0
Future Contracts | Sold Position | Foreign Currency      
Trading      
Notional [1] 1,992,574 745,849 17,384,256
Fair Value 0 0 0
Future Contracts | Sold Position | Indexes      
Trading      
Notional [1],[3] 202,894 20,803 185,506
Fair Value [3] 0 0 0
Future Contracts | Sold Position | Treasury Bonds/Notes      
Trading      
Notional [1] 0 0 2,588,794
Fair Value 0 0 0
Future Contracts | Purchased Position      
Trading      
Notional [1] 86,203,734 54,806,022 40,396,456
Fair Value 0 0 0
Future Contracts | Purchased Position | Exchange Coupon (DDI)      
Trading      
Notional [1] 20,590,068 9,616,936 14,473,180
Fair Value 0 0 0
Future Contracts | Purchased Position | Interest Rates (DI1 and DIA)      
Trading      
Notional [1] 32,690,685 26,456,303 23,756,523
Fair Value 0 0 0
Future Contracts | Purchased Position | Foreign Currency      
Trading      
Notional [1] 32,456,813 16,733,437 1,393,538
Fair Value 0 0 0
Future Contracts | Purchased Position | Indexes      
Trading      
Notional [1],[3] 466,168 1,780,311 195,160
Fair Value [3] 0 0 0
Future Contracts | Purchased Position | Others      
Trading      
Notional [1] 0 219,035 578,055
Fair Value 0 0 0
Forward Contracts and Others      
Trading      
Notional [1] 90,910,841 47,823,561 50,853,154
Fair Value 1,055,456 (720,823) 1,643,013
Forward Contracts and Others | Sold Commitment      
Trading      
Notional [1] 52,244,572 24,317,465 29,988,984
Fair Value (248,105) (1,368,199) (1,743,334)
Forward Contracts and Others | Currencies | Sold Commitment      
Trading      
Notional [1] 51,958,529 22,096,104 29,911,406
Fair Value (252,160) (1,364,617) (1,826,965)
Forward Contracts and Others | Others | Sold Commitment      
Trading      
Notional [1] 286,043 2,221,361 77,578
Fair Value 4,055 (3,582) 83,631
Forward Contracts and Others | Purchased Commitment      
Trading      
Notional [1] 38,666,269 23,506,096 20,864,170
Fair Value 1,303,561 647,376 3,386,347
Forward Contracts and Others | Purchased Commitment | Currencies      
Trading      
Notional [1] 38,095,625 21,525,220 19,951,984
Fair Value 1,250,706 618,007 3,391,275
Forward Contracts and Others | Purchased Commitment | Others      
Trading      
Notional [1] 570,644 1,980,876 912,186
Fair Value R$ 52,855 R$ 29,369 R$ (4,928)
[1] Nominal value of updated contracts.
[2] Includes options of index, mainly being options involving US treasury, shares and stock indexes.
[3] Includes Bovespa and S&P index.