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Minimum cash and minimum capital - Minimum capital (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Minimum Capital [Abstract] |  |
Credit risk | $ 41,910,608 | $ 44,561,930
Operational risk | 15,140,288 | 13,623,927
Market risk | 227,001 | 372,032
Total capital | 142,146,791 | 138,508,035
Excess capital | $ 84,868,894 | $ 79,950,146

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- Definition Minimum capital integration. + References No definition available. + Details
Name: | bbar_CapitalPaid
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Excess in paid capital. + References No definition available. + Details
Name: | bbar_ExcessInTheCapitalPaid
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum Capital + References No definition available. + Details
Name: | bbar_MinimumCapitalAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum capital required for credit risk. + References No definition available. + Details
Name: | bbar_MinimumCapitalForCreditRisk
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum capital required by market risk. + References No definition available. + Details
Name: | bbar_MinimumCapitalForMarketRisk
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum capital required for operational risk. + References No definition available. + Details
Name: | bbar_MinimumCapitalForOperationalRisk
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration