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Securities - Summary of securities classified at fair value through profit and loss and at fair value through other comprehensive income (Detail) - BRL (R$)
R$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss R$ 33,606,516 R$ 26,528,396 R$ 7,983,002
Financial assets at fair value through other comprehensive income 4,896,387 2,616,118 695,778
Cost [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 24,911,824 22,332,936 6,262,735
Financial assets at fair value through other comprehensive income 4,836,127 2,608,325 688,731
Cost [member] | Agribusiness Receivables Certificates [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 532,281 598,085 85,668
Cost [member] | Bank deposit certificates [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 270,022 244,071 172,451
Cost [member] | Brazilian Government Bonds [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 15,461,665 15,404,300 3,826,902
Cost [member] | Certificate of Real Estate Receivable [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 211,458 75,922 208,442
Cost [member] | Debentures [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 1,017,997 885,344 325,459
Cost [member] | Financial credit bills [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 83,762 98,068 45,040
Cost [member] | Investment funds [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 4,525,734 3,047,198 279,013
Cost [member] | Others [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 333,089 178,589 167,714
Cost [member] | Real Estate Credit Bill [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 1,367 1,282 3,697
Cost [member] | Structured Transaction Certificate [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 305,188 237,112 21,275
Cost [member] | Stocks issued by public-held company [Member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 312,547 1,562,965 1,127,074
Cost [member] | National treasury bill [Member]      
Disclosure of financial assets [line items]      
Financial assets at fair value through other comprehensive income 4,836,127 2,608,325 688,731
Cost [member] | USA Government Bonds [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 1,856,714    
Fair value [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 25,091,723 22,443,392 6,290,971
Financial assets at fair value through other comprehensive income 4,896,387 2,616,118 695,778
Fair value [member] | Agribusiness Receivables Certificates [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 515,994 589,525 85,874
Fair value [member] | Bank deposit certificates [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 272,972 246,827 171,725
Fair value [member] | Brazilian Government Bonds [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 15,669,359 15,494,046 3,853,534
Fair value [member] | Certificate of Real Estate Receivable [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 205,546 75,123 207,167
Fair value [member] | Debentures [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 973,503 885,068 326,403
Fair value [member] | Financial credit bills [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 82,765 106,759 44,663
Fair value [member] | Investment funds [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 4,525,734 3,047,198 279,013
Fair value [member] | Others [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 342,656 178,200 167,716
Fair value [member] | Real Estate Credit Bill [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 1,392 1,300 4,883
Fair value [member] | Structured Transaction Certificate [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 332,039 256,381 22,949
Fair value [member] | Stocks issued by public-held company [Member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss 312,547 1,562,965 1,127,044
Fair value [member] | National treasury bill [Member]      
Disclosure of financial assets [line items]      
Financial assets at fair value through other comprehensive income 4,896,387 R$ 2,616,118 R$ 695,778
Fair value [member] | USA Government Bonds [member]      
Disclosure of financial assets [line items]      
Financial assets At fair value through profit or loss R$ 1,857,216