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Financial risk management - financial assets and liabilities by contractual term (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | R$ 35,805,528 | R$ 19,515,660
Financial liabilities by contractual term | 27,956,065 | (16,482,563)
Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 10,816,713 | 7,272,726
Financial liabilities by contractual term | 17,153,415 | (9,813,691)
From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 4,099,619 | 2,069,146
Financial liabilities by contractual term | 10,506,766 | (1,184,793)
Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 20,889,196 | 10,173,788
Financial liabilities by contractual term | 295,884 | (5,484,079)
Liabilities with financial institutions |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 5,341,464 | 1,756,913
Liabilities with financial institutions | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 5,306,020 | 1,706,681
Liabilities with financial institutions | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 35,444 | 50,232
Liabilities with customer |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 18,333,543 | 12,436,632
Liabilities with customer | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 11,360,378 | 7,550,562
Liabilities with customer | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 6,956,400 | 607,077
Liabilities with customer | Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 16,765 | 4,278,993
Securities issued [Member].. |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 3,572,093 | 1,729,436
Securities issued [Member].. | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 112,591 | 80,924
Securities issued [Member].. | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 3,349,639 | 505,572
Securities issued [Member].. | Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 109,863 | 1,142,940
Derivative financial instrument |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 66,545 | 56,758
Derivative financial instrument | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 29,452 | 20,767
Derivative financial instrument | Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 37,093 | 35,991
Borrowing and onlending [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 25,071 | 27,405
Borrowing and onlending [Member] | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 99 | 104
Borrowing and onlending [Member] | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 1,087 | 1,145
Borrowing and onlending [Member] | Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 23,886 | 26,156
Other liabilities [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 617,349 | 475,420
Other liabilities [Member] | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 374,327 | 475,420
Other liabilities [Member] | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 134,744 |
Other liabilities [Member] | Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial liabilities by contractual term | 108,277 |
Cash and cash equivalents |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 500,446 | 2,154,687
Cash and cash equivalents | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 500,446 | 2,154,687
Compulsory deposits at Banco Central do Brasil |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 2,399,488 | 502,369
Compulsory deposits at Banco Central do Brasil | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 2,399,488 | 502,369
Amounts due from financial institution |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 2,051,862 | 1,709,729
Amounts due from financial institution | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 2,051,862 | 1,207,383
Amounts due from financial institution | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term |  | 502,346
Securities [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 12,757,687 | 5,812,622
Securities [Member] | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 474,509 | 196,927
Securities [Member] | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 203,451 | 161,356
Securities [Member] | Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 12,079,727 | 5,454,339
Derivative financial instrument |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 86,948 | 27,513
Derivative financial instrument | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 86,948 | 6,510
Derivative financial instrument | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term |  | 21,003
Loans and advances to customers |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 17,216,362 | 8,790,058
Loans and advances to customers | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 4,616,124 | 2,795,385
Loans and advances to customers | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 3,868,156 | 1,357,068
Loans and advances to customers | Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 8,732,082 | 4,637,605
Other assets [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 792,735 | 518,681
Other assets [Member] | Up to 3 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 687,336 | 409,465
Other assets [Member] | From 3 to 12 months |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | 28,012 | 27,373
Other assets [Member] | Above 1 year |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Financial assets by contractual term | R$ 77,387 | R$ 81,844

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