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Fee and Commission Expense (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fee and commission expense [abstract] |  |  |
For credit and debit cards | $ 67,777,600 | $ 71,874,724 | $ 72,598,091
For foreign trade transactions | 18,507,530 | 3,068,814 | 3,093,282
For promotions and other | 11,650,892 | 8,136,693 | 9,553,506
Linked to transactions with securities | 67,420 | 48,894 | 72,604
Other commission expenses | 17,383,867 | 18,354,987 | 14,397,779
TOTAL | $ 115,387,309 | $ 101,484,112 | $ 99,715,262

X
- Definition The amount of expense relating commissions for credit and debit cards. + References No definition available. + Details
Name: | bbar_CommissionsForcredItAndDebitCards
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense relating commissions for foreign trade transactions. + References No definition available. + Details
Name: | bbar_ForForeignTradeTransactions
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense relating commissions for promotions. + References No definition available. + Details
Name: | bbar_ForPromotions
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Linked to transactions with securities. + References No definition available. + Details
Name: | bbar_LinkedToTransactionsWithSecurities
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense relating commissions for other commission expenses. + References No definition available. + Details
Name: | bbar_OtherCommissionExpenses
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense relating to fees and commissions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_FeeAndCommissionExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_FeeAndCommissionExpenseAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration