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Note 9 - Financial Assets at Fair Value Through Profit or Loss - Derivative Financial Assets FVTPL (Details) - ARS ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Derivative Financial Assets FVTPL Abstract |  |  |
Foreign Currency Forwards Assets | $ 591,418,000 | $ 162,494,000 | $ 52,798,000
Interest Rate Swaps Assets | 0 | 48,262,000 | 46,189,000
Total Derivative Financial Assets FVTPL | $ 591,418,000 | $ 210,756,000 | $ 98,987,000

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

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- Definition The amount of foreign currency forward contracts held by the entity. + References No definition available. + Details
Name: | bfr_Foreigncurrencyforwardsassets
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of interest rate swap contracts held by the entity. + References No definition available. + Details
Name: | bfr_Variableforfixedinterestrateswapsassets
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DerivativeFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant