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Financial Instruments Risks - Progress of LCR Ratios (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Progress Of Lcr Ratios [Abstract] |  |
LCR | 413.00% | 291.00%

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- Definition The relation between high quality liquid assets and total net cash outflows during a 30 day period. + References No definition available. + Details
Name: | bbar_LiquidityCoverageRatios
Namespace Prefix: | bbar_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Progress of lcr ratios. + References No definition available. + Details
Name: | bbar_ProgressOfLcrRatiosAbstract
Namespace Prefix: | bbar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration