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Financial Assets at Amortised Cost - Loans and Advances to Customers (Details) - ARS ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Loans And Receivables [Abstract] |  |
Credit Cards | $ 114,535,142 | $ 98,110,800
Consumer loans | 28,120,635 | 32,122,283
Commercial papers | 19,117,168 | 16,794,614
Overdrafts | 17,411,178 | 19,600,558
Real estate mortgage | 16,745,745 | 19,265,842
Loans for the prefinancing and financing of exports | 15,979,854 | 24,908,414
Notes | 14,702,105 | 15,466,297
Pledge loans | 11,412,208 | 11,785,802
Loans to employees | 2,131,958 | 2,333,951
Receivables from financial leases | 1,867,439 | 2,572,772
Other financing | 48,301,667 | 31,299,660
Allowances for loan losses | (12,501,302) | (15,536,909)
TOTAL | $ 277,823,797 | $ 258,724,084

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 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -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 2020-01-01 + 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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ConsumerLoans
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant