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Financial assets at amortized cost - Loans and Advances to Customers (Details) - ARS ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Loans And Receivables [Abstract] |  |
Credit Cards | $ 702,657,639 | $ 854,924,949
Notes | 318,069,103 | 181,250,348
Overdrafts | 176,515,811 | 196,021,914
Loans for prefinancing and financing of exports | 153,200,806 | 78,079,366
Consumer loans | 151,819,857 | 222,107,654
Commercial papers | 145,212,037 | 182,199,444
Real estate mortgage | 79,404,563 | 119,922,367
Pledge loans | 44,335,196 | 76,942,252
Receivables from financial leases | 12,719,733 | 19,892,649
Loans to employees | 10,268,564 | 15,016,004
Other financing | 210,138,365 | 337,838,753
Allowances for ECL | (44,440,936) | (64,326,062)
TOTAL | $ 1,959,900,738 | $ 2,219,869,638

X
- Definition The amount of commercial papers. + References No definition available. + Details
Name: | bbar_CommercialPapers
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of credit card loans. + References No definition available. + Details
Name: | bbar_CreditCards
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans and receivables abstract. + References No definition available. + Details
Name: | bbar_LoansAndReceivablesAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of loans for the prefinancing and financing of exports. + References No definition available. + Details
Name: | bbar_LoansForThePrefinancingAndFinancingOfExports
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of overdraft loans. + References No definition available. + Details
Name: | bbar_LoansOverdrafts
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of loans to personnel. + References No definition available. + Details
Name: | bbar_LoansToPersonnel
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of note loans. + References No definition available. + Details
Name: | bbar_NotesLoans
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of other financing. + References No definition available. + Details
Name: | bbar_OtherFinancing
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of pledge loans. + References No definition available. + Details
Name: | bbar_PledgeLoans
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of real estate mortgages. + References No definition available. + Details
Name: | bbar_RealEstateMortgage
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of receivable from financial leases. + References No definition available. + Details
Name: | bbar_ReceivableFromFinancialLeases
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of loans and advances the entity has made to customers. + References No definition available. + Details
Name: | bbar_TotalLoansToCostumers
Namespace Prefix: | bbar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expired 2023-01-01 -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2023-03-23 + Details
Name: | ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of consumer loans made by the entity. [Refer: Loans to consumers [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ConsumerLoans
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant