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Note 47 - Deposits Guarantee Regime (Details) - ARS ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Deposits Guarantee Regime Abstract |  |
Contributions to the Deposits Guarantee Fund | $ (394,431,000) | $ (348,836,000)
Percentage of Shares in SEDESA | 10.038% |

X
- Definition The amount of other operating expenses for contributions to the deposits guarantee fund. + References No definition available. + Details
Name: | bfr_Contributionstothedepositsguaranteefund
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition The percent of shares in SEDESA. + References No definition available. + Details
Name: | bfr_Percentageofsharesinsedesa
Namespace Prefix: | bfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration