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Note 10 - Financial Assets at Amortised Cost - Reverse Repurchase Agreements (Details) - ARS ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Reverse Repurchase Agreements Abstract |  |  |
Financial Institutions Reverse Repurchase Agreements | $ 154,753,000 | $ 890,355,000 | $ 107,461,000
BCRA Reverse Repurchase Agreements | 0 | 1,999,110,000 | 0
Argentine Government Reverse Repurchase Agreements | 12,706,363,000 | 6,456,412,000 | 0
Allowance for Reverse Repurchase Agreements | (141,985,000) | 0 | 0
Total Reverse Repurchase Agreements | $ 12,719,131,000 | $ 9,345,877,000 | $ 107,461,000

X
- Definition The amount of an allowance account used to reverse repurchase agreements. + References No definition available. + Details
Name: | bfr_Allowanceforreverserepurchaseagreements
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of reverse repurchase agreements entered into with the argentine government. + References No definition available. + Details
Name: | bfr_Argentinegovernmentreverserepurchaseagreements
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of reverse repurchase agreements entered into with the central bank. + References No definition available. + Details
Name: | bfr_Bcrareverserepurchaseagreements
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of reverse repurchase agreements entered into with financial institutions. + References No definition available. + Details
Name: | bfr_Financialinstitutionsreverserepurchaseagreements
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent] + 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_ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant