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Financial Assets at Amortised Cost - Loans and Advances to Customers (Details) - ARS ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Loans And Receivables [Abstract] |  |
Credit Cards | $ 157,138,508 | $ 172,881,176
Consumer loans | 40,950,803 | 42,445,738
Commercial papers | 29,133,603 | 28,855,759
Overdrafts | 22,528,190 | 26,280,711
Real estate mortgage | 22,908,902 | 25,276,294
Loans for prefinancing and financing of exports | 13,342,611 | 24,120,247
Notes | 20,402,921 | 22,191,592
Pledge loans | 16,341,659 | 17,225,768
Loans to employees | 2,916,555 | 3,218,012
Receivables from financial leases | 2,912,334 | 2,818,742
Other financing | 59,864,344 | 72,907,308
Allowances for loan losses | (13,656,218) | (18,869,665)
TOTAL | $ 374,784,212 | $ 419,351,682

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 Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ConsumerLoans
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant