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v3.20.1

Fee and Commission Expense (Details) - ARS ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fee and commission expense [abstract] |  |  |
Commission Income Linked to Credit Cards | $ 6,072,334 | $ 5,282,111 | $ 4,273,979
For promotions | 1,927,178 | 2,001,304 | 1,500,992
Other commission expenses | 1,073,701 | 935,567 | 1,513,332
For foreign trade transactions | 356,640 | 241,249 | 219,696
Linked to transactions with securities | 2,937 | 2,866 | 2,674
Total Fee and Commission Expense | $ 9,432,790 | $ 8,463,097 | $ 7,510,673

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 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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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