Financial risk management - Credit risk - guarantees on real estate loans (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure of credit risk exposure [line items]
Securities	R$ 33,406,040	R$ 19,515,659
Real Estate loans
Disclosure of credit risk exposure [line items]
Securities	5,121,411	3,471,354
Real Estate loans \| Credit Grade Where Loan To Value Ratio Is Lower Than 30 Percent
Disclosure of credit risk exposure [line items]
Securities	582,421	467,960
Real Estate loans \| Credit Grade Where Loan To Value Ratio Is Between 31 and 50 Percent
Disclosure of credit risk exposure [line items]
Securities	1,584,454	1,291,130
Real Estate loans \| Credit Grade Where Loan To Value Ratio Is Between 51 and 70 Percent
Disclosure of credit risk exposure [line items]
Securities	2,116,015	1,314,740
Real Estate loans \| Credit Grade Where Loan To Value Ratio Is Between 71 and 90 Percent
Disclosure of credit risk exposure [line items]
Securities	756,870	370,357
Real Estate loans \| Credit Grade Where Loan To Value Ratio Is Higher Than 90 Percent
Disclosure of credit risk exposure [line items]
Securities	R$ 81,651	R$ 27,167

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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