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Derivative financial instruments (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Swap contract [member]    
IfrsStatementLineItems [Line Items]    
Notional R$ 1,091,352,145 R$ 858,277,413
Curve value (2,221,515) (5,247,457)
Financial assets, at fair value (297,630) (35,508)
Notional amount 1,091,352,145 858,277,413
Swap contract [member] | Trading Assets [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 9,298,735 11,989,199
Financial assets, at fair value 11,595,591 16,710,659
Notional amount 544,480,673 421,892,846
Swap contract [member] | Trading Assets [Member] | C D I Interbank Deposit Rates [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 6,039,353 8,288,494
Financial assets, at fair value 6,846,017 9,155,516
Notional amount 424,253,131 212,769,602
Swap contract [member] | Trading Assets [Member] | Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 3,257,875 3,593,516
Financial assets, at fair value 4,746,233 7,449,012
Notional amount 118,489,312 207,863,441
Swap contract [member] | Trading Assets [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 1,507 107,189
Financial assets, at fair value 3,341 106,131
Notional amount 1,738,230 1,259,803
Swap contract [member] | Tradng Liabilities [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (11,520,250) (17,236,656)
Financial assets, at fair value (11,893,221) (16,746,167)
Notional amount 546,871,472 436,384,567
Swap contract [member] | Tradng Liabilities [Member] | C D I Interbank Deposit Rates [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (10,369,508) (13,645,096)
Financial assets, at fair value (10,349,447) (13,848,265)
Notional amount 510,279,375 300,101,297
Swap contract [member] | Tradng Liabilities [Member] | Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (1,150,742) (3,588,425)
Financial assets, at fair value (1,353,372) (2,726,684)
Notional amount 35,498,945 133,470,413
Swap contract [member] | Tradng Liabilities [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (3,135)
Financial assets, at fair value (190,402) (171,218)
Notional amount 1,093,152 2,812,857
Option contract [member]    
IfrsStatementLineItems [Line Items]    
Curve value (2,364,529) (1,728,092)
Financial assets, at fair value 341,643 505,859
Notional amount 724,241,728 538,580,487
Option contract [member] | Purchased Position [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 4,436,345 2,889,580
Financial assets, at fair value 6,312,487 4,960,933
Notional amount 300,697,253 248,136,848
Option contract [member] | Purchased Position [Member] | Call Option U S Dollar [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 2,152,833 1,170,432
Financial assets, at fair value 2,066,252 2,035,002
Notional amount 20,042,978 17,652,929
Option contract [member] | Purchased Position [Member] | Put Option U S Dollar [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 855,034 449,432
Financial assets, at fair value 900,935 297,814
Notional amount 15,954,554 10,969,754
Option contract [member] | Purchased Position [Member] | Call Option Other [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 887,741 769,593
Financial assets, at fair value 3,216,466 2,530,004
Notional amount 12,400,038 25,078,274
Option contract [member] | Purchased Position [Member] | Call Option Other [Member] | Interbank Market [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 555,307 420,720
Financial assets, at fair value 2,287,818 1,456,616
Notional amount 5,677,984 4,228,408
Option contract [member] | Purchased Position [Member] | Call Option Other [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 332,434 348,873
Financial assets, at fair value 928,648 1,073,388
Notional amount 6,722,054 20,849,866
Option contract [member] | Purchased Position [Member] | Put Option Other [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 540,737 500,123
Financial assets, at fair value 128,834 98,113
Notional amount 252,299,683 194,435,891
Option contract [member] | Purchased Position [Member] | Put Option Other [Member] | Interbank Market [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 113,366 111,802
Financial assets, at fair value 74,030 80,262
Notional amount 204,462 553,161
Option contract [member] | Purchased Position [Member] | Put Option Other [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 427,371 388,321
Financial assets, at fair value 54,804 17,851
Notional amount 252,095,221 193,882,730
Option contract [member] | Sold Position [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (6,800,874) (4,617,672)
Financial assets, at fair value (5,970,844) (4,455,074)
Notional amount 423,544,475 290,443,639
Option contract [member] | Sold Position [Member] | Call Option U S Dollar [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (629,651) (597,168)
Financial assets, at fair value (430,424) (786,706)
Notional amount 11,780,868 10,516,526
Option contract [member] | Sold Position [Member] | Put Option U S Dollar [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (637,961) (555,932)
Financial assets, at fair value (681,040) (275,212)
Notional amount 12,130,582 11,046,513
Option contract [member] | Sold Position [Member] | Call Option Other [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (4,452,630) (2,868,865)
Financial assets, at fair value (3,443,887) (3,203,477)
Notional amount 90,098,059 57,500,051
Option contract [member] | Sold Position [Member] | Call Option Other [Member] | Interbank Market [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (2,505,829) (2,104,995)
Financial assets, at fair value (1,845,726) (1,578,796)
Notional amount 25,152,891 21,145,788
Option contract [member] | Sold Position [Member] | Call Option Other [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (1,946,801) (763,870)
Financial assets, at fair value (1,598,161) (1,624,681)
Notional amount 64,945,168 36,354,263
Option contract [member] | Sold Position [Member] | Put Option Other [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (1,080,632) (595,707)
Financial assets, at fair value (1,415,493) (189,679)
Notional amount 309,534,966 211,380,549
Option contract [member] | Sold Position [Member] | Put Option Other [Member] | Interbank Market [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (239,648) (155,776)
Financial assets, at fair value (507,171) (29,908)
Notional amount 2,860,119 1,395,691
Option contract [member] | Sold Position [Member] | Put Option Other [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (840,984) (439,931)
Financial assets, at fair value (908,322) (159,771)
Notional amount 306,674,847 209,984,858
Futures contract [member]    
IfrsStatementLineItems [Line Items]    
Curve value
Financial assets, at fair value
Notional amount 567,709,896 785,337,224
Futures contract [member] | Purchased Position [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets, at fair value
Notional amount 283,663,279 396,239,839
Futures contract [member] | Purchased Position [Member] | Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Curve value
Financial assets, at fair value
Notional amount 21,182,934 106,481,787
Futures contract [member] | Purchased Position [Member] | Exchange Coupon D D I [Member]    
IfrsStatementLineItems [Line Items]    
Curve value
Financial assets, at fair value
Notional amount 95,881,997 143,814,584
Futures contract [member] | Purchased Position [Member] | Interest Rates D I 1 And D I A [Member]    
IfrsStatementLineItems [Line Items]    
Curve value
Financial assets, at fair value
Notional amount 160,220,757 135,768,788
Futures contract [member] | Purchased Position [Member] | Indexes [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount 3,206,380 7,717,797
Futures contract [member] | Purchased Position [Member] | Treasury Bonds Notes [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount 3,171,211 2,456,883
Futures contract [member] | Sold Position [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount 284,046,617 389,097,385
Futures contract [member] | Sold Position [Member] | Foreign Currency [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount 21,545,898 96,976,790
Futures contract [member] | Sold Position [Member] | Indexes [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount 3,206,380 7,717,797
Futures contract [member] | Sold Position [Member] | Treasury Bonds Notes [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount 3,171,211 2,456,883
Futures contract [member] | Sold Position [Member] | Foreign Exchange Coupon [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount 95,902,371 143,814,584
Futures contract [member] | Sold Position [Member] | Interest Rates [Member]    
IfrsStatementLineItems [Line Items]    
Notional amount 160,220,757 138,131,331
Futures contract [member] | Purchased Commitment [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 5,957,072 13,065,871
Financial assets, at fair value 47,899,620 18,534,707
Notional amount 221,363,620 226,379,907
Futures contract [member] | Purchased Commitment [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 338,839 8,416,488
Financial assets, at fair value 39,408,926 15,917,171
Notional amount 67,098,260 49,898,477
Futures contract [member] | Purchased Commitment [Member] | Currencies [Member]    
IfrsStatementLineItems [Line Items]    
Curve value 5,618,233 4,649,383
Financial assets, at fair value 8,490,694 2,617,536
Notional amount 154,265,360 176,481,430
Futures contract [member] | Sold Commitment [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (43,353,037) (6,390,856)
Financial assets, at fair value (42,147,926) (18,209,033)
Notional amount 258,759,585 217,342,349
Futures contract [member] | Sold Commitment [Member] | Others [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (508,555) (456,847)
Financial assets, at fair value (39,634,499) (12,057,769)
Notional amount 67,267,976 39,576,293
Futures contract [member] | Sold Commitment [Member] | Currencies [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (42,844,482) (5,934,009)
Financial assets, at fair value (2,513,427) (6,151,264)
Notional amount 191,491,609 177,766,056
Forward Contracts And Other [Member]    
IfrsStatementLineItems [Line Items]    
Curve value (37,395,965) 6,675,015
Financial assets, at fair value 5,751,694 325,674
Notional amount R$ 480,123,205 R$ 443,722,256