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Note 23 - Financial Liabilities at Amortised Cost - Repurchase Agreements (Details) - ARS ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Repurchase Agreements Abstract |  |  |
Financial institutions Repurchase Agreements | $ 14,321,000 | $ 421,395,000 | $ 249,000,000
Total Repurchase Agreements | $ 14,321,000 | $ 421,395,000 | $ 249,000,000

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

X
- Definition The amount of instruments purchased for resale in repurchase agreements. + References No definition available. + Details
Name: | bfr_Repurchaseagreements
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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