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Liabilities with financial and similar institutions (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities with financial and similar institutions |  |
Time deposits | R$ 139,477 |
Payables with credit card network | 3,876,964 | R$ 1,654,039
Interdependent relations | 351,490 |
Securities sold under agreements to repurchase | 973,533 | 102,874
Total liabilities with financial institutions | R$ 5,341,464 | R$ 1,756,913

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- Definition Amount of time deposit liabilities, including certificates of deposit. + References No definition available. + Details
Name: | b3_IfrsTimeDeposits
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount payables for interdependent relations. + References No definition available. + Details
Name: | b3_InterdependentRelations
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the liabilities with financial institutions as of balance sheet date. + References No definition available. + Details
Name: | b3_LiabilitiesWithFinancialAndSimilarInstitutions
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | b3_LiabilitiesWithFinancialAndSimilarInstitutionsAbstract
Namespace Prefix: | b3_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount payables with credit card network. + References No definition available. + Details
Name: | b3_PayablesWithCreditCardNetwork
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_RepurchaseAgreementsAndCashCollateralOnSecuritiesLent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant