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Note 15 - Financial Assets at Fair Value Through Other Comprehensive Income - Debt Securities FVOCI (Details) - ARS ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Debt Securities FVOCI Abstract |  |  |
Government Securities FVOCI | $ 9,815,621,000 | $ 8,239,068,000 | $ 5,750,969,000
BCRA Bills FVOCI | 0 | 15,590,426,000 | 10,915,862,000
BCRA Bills Pledged as Collateral FVOCI | 1,061,766,000 | 1,141,301,000 | 270,730,000
BCRA Liquidity Bills FVOCI | 13,815,040,000 | 0 | 0
Private Securities Corporate Bonds FVOCI | 113,148,000 | 237,104,000 | 276,801,000
Government Securities Pledged as Collateral FVOCI | 16,035,000 | 0 | 1,962,000
Allowances for Loans Losses of Debt Securities FVOCI | (271,574,000) | (5,664,000) | (1,504,000)
Total Debt Securities FVOCI | $ 24,550,036,000 | $ 25,202,235,000 | $ 17,214,820,000

X
- Definition The amount of allowances for debt securities held at fair value through other comprehensive income. + References No definition available. + Details
Name: | bfr_Allowancesforloanslossesfvoci
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

X
- Definition The amount of instruments of debt securities held by the entity at fair value through other comprehensive income. + References No definition available. + Details
Name: | bfr_Debtsecuritiesheldfvoci
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | bfr_Debtsecuritiesheldfvociabstract
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_Governmentsecuritiesfvoci
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The amount of debt investment securities by the entity that were issued by a corporate entity. + References No definition available. + Details
Name: | bfr_Privatesecuritiescorporatebondsfvoci
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant