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Note 9 - Financial Assets at Fair Value Through Profit or Loss - Debt Securities FVTPL (Details) - ARS ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Debt Securities FVTPL Abstract |  |  |
Government Securities FVTPL | $ 952,798,000 | $ 2,082,328,000 | $ 3,748,047,000
Government Securities Pledged as Collateral FVTPL | 0 | 31,124,000 | 0
Private Securities Corporate Bonds FVTPL | 167,913,000 | 197,983,000 | 325,605,000
BCRA Bills FVTPL | 6,387,388,000 | 6,276,692,000 | 2,691,284,000
Debt Securities FVTPL | $ 7,508,099,000 | $ 8,588,127,000 | $ 6,764,936,000

X
- Definition The amount of Central Bank of the Argentine Republic bills held by the entity. + References No definition available. + Details
Name: | bfr_Bcrabills
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of debt securities held by the entity. + References No definition available. + Details
Name: | bfr_Debtsecuritiesheld
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The amount of government securities held by the entity. + References No definition available. + Details
Name: | bfr_Governmentsecurities
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of Government Securities pledged as collateral held by the entity. + References No definition available. + Details
Name: | bfr_Governmentsecuritiespledgedascollateral
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of private securities corporate bonds held by the entity. + References No definition available. + Details
Name: | bfr_Privatesecuritiescorporatebonds
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant