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Note 10 - Financial Assets at Amortised Cost (Details) - ARS ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Fair Value of Finacial Assets Accepted as Collateral Abstract |  |  |
Fair Value of Finacial Assets Accepted as Collateral | $ 26,150,141,000 | $ 17,201,658,000 | $ 119,530,000

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- Definition The fair value of financial assets accepted as collateral that the Group is permitted to sell or repledge in the absence of default. + References No definition available. + Details
Name: | bfr_Fairvalueoffinacialassetsacceptedascollateral
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | bfr_Fairvalueoffinacialassetsacceptedascollateralabstract
Namespace Prefix: | bfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration