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Minimum cash andminimum capital - Minimum capital (Details) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Minimum Capital [Abstract] |  |
Credit risk | $ 222,092,365 | $ 219,153,734
Operational risk | 90,508,105 | 88,131,816
Market risk | 6,537,813 | 4,611,870
Incremental requirement | 17,505,613 | 0
Total capital | 1,140,647,877 | 958,835,096
Excess capital | $ 804,003,981 | $ 646,937,676

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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

X
- 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 for non-compliance. + References No definition available. + Details
Name: | bbar_MinimumCapitalForNonCompliance
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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