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v3.20.1

Minimum cash and minimum capital - Minimum cash (Detail) - ARS ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Minimum Cash [Abstract] |  |
BCRA – current account - not restricted | $ 107,454,632,000 | $ 126,326,564,000
BCRA – special guarantee accounts – restricted | 2,827,885,000 | 1,904,833,000
SUBTOTAL BALANCES AT THE BCRA | 110,282,517,000 | 128,231,397,000
Argentine Treasury Bonds in pesos at fixed rate due November 2020 | 7,300,220,000 | 10,669,815,000
Liquidity Bills – BCRA | 33,061,179,000 | 31,077,880,000
TOTAL | $ 150,643,916,000 | $ 169,979,092,000

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- Definition The minimum cash amount that maintain in the liquidity bills in BCRA. + References No definition available. + Details
Name: | bbar_ArgentineTreasuryBondsInPesosAtFixedRate
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The minimum cash regulations establish the obligation to maintain liquidations in the unrestricted current account of the BCRA. + References No definition available. + Details
Name: | bbar_CurrentAccountNotRestrictedInTheBcra
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of balances at the BCRA. + References No definition available. + Details
Name: | bbar_LiquidityBillsBcra
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The minimum cash regulations establish the obligation to maintain liquidation in the special guarantee accounts restricted in the BCRA. + References No definition available. + Details
Name: | bbar_SpecialGuaranteeAccountsRestrictedInTheBcra
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The minimum cash amount that maintain in the argentine treasury bonds in pesos at fixed rate. + References No definition available. + Details
Name: | bbar_SubTotalBalancesAtTheBcra
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total minimum cash establish in the BCRA. + References No definition available. + Details
Name: | bbar_TotalMinimumCash
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration