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v3.21.1

Fee and Commission Expense (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fee and commission expense [abstract] |  |  |
For credit and debit cards | $ 8,524,712 | $ 8,266,906 | $ 7,191,092
For promotions | 1,746,686 | 2,623,670 | 2,724,585
For foreign trade transactions | 278,455 | 485,530 | 328,438
Linked to transactions with securities | 4,534 | 4,000 | 3,902
Other commission expenses | 868,847 | 1,461,741 | 1,273,686
Total Fee and Commission Expense | $ 11,423,234 | $ 12,841,847 | $ 11,521,703

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

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- 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 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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