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Financial liabilities at fair value through profit or loss -Trading liabilities FVTPL (Details) - ARS ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Trading Liabilities [Abstract] |  |
Short Sold Positions | $ 580,802 | $ 1,064,936
Total Liabilities | $ 580,802 | $ 1,064,936

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- Definition Short sold positions. + References No definition available. + Details
Name: | bbar_ShortSoldPositions
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of short sold positions. + References No definition available. + Details
Name: | bbar_TradingLiabilities
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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