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Financial assets at fair value through profit or loss - Debt Securities FVTPL (Detail) - ARS ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities Held [Abstract]
BCRA Liquidity Bills	$ 3,984,496	$ 9,825,872
Private securities - Corporate bonds	93,603	258,305
Government securities	51,871	1,465,712
TOTAL	$ 4,129,970	$ 11,549,889

X

- Definition

The amount of Central Bank of the Argentine Republic bills held by the entity.

+ References

No definition available.

+ Details

Name:	bbar_BcraBills
Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of debt securities held by the entity.

+ References

No definition available.

+ Details

Name:	bbar_DebtSecuritiesHeld
Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Debt securities held

+ References

No definition available.

+ Details

Name:	bbar_DebtSecuritiesHeldAbstract
Namespace Prefix:	bbar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of government securities held by the entity.

+ References

No definition available.

+ Details

Name:	bbar_GovernmentSecurities
Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of private securities corporate bonds held by the entity.

+ References

No definition available.

+ Details

Name:	bbar_PrivateSecuritiesCorporateBonds
Namespace Prefix:	bbar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant