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Minimum cash and minimum capital - Minimum capital (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Minimum Capital [Abstract] |  |
Credit risk | $ 29,522,630 | $ 24,504,510
Operational risk | 9,025,959 | 8,712,818
Market risk | 246,474 | 413,483
Total capital | 91,762,665 | 68,056,213
Excess capital | $ 52,967,602 | $ 34,425,402

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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