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v3.20.1

Minimum cash and minimum capital - Minimum capital (Detail) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Minimum Capital [Abstract] |  |
Credit risk | $ 17,999,427 | $ 27,824,585
Operational risk | 6,399,872 | 5,529,881
Market risk | 303,718 | 142,735
Total capital | 49,989,689 | 55,801,416
Excess capital | $ 25,286,672 | $ 22,304,215

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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