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Note 48 - Minimum Cash and Minimum Capital - Minimum Capital (Details) - ARS ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Minimum Capital Abstract |  |
Minimum Capital for Credit Risk | $ 18,087,597,000 | $ 18,790,435,000
Minimum Capital for Operational Risk | 3,594,744,000 | 3,776,621,000
Minimum Capital for Market Risk | 92,786,000 | 545,113,000
Paid-in | 36,274,163,000 | 40,321,634,000
Surplus | $ 14,499,036,000 | $ 17,209,465,000

X
- Definition Minimum capital integration. + References No definition available. + Details
Name: | bfr_Capitalpaid
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Excess in paid capital. + References No definition available. + Details
Name: | bfr_Excessinthecapitalpaid
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Minimum capital required for credit risk. + References No definition available. + Details
Name: | bfr_Minimumcapitalforcreditrisk
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Minimum capital required by market risk. + References No definition available. + Details
Name: | bfr_Minimumcapitalformarketrisk
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Minimum capital required for operational risk. + References No definition available. + Details
Name: | bfr_Minimumcapitalforoperationalrisk
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration