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Note 45 - Leases - Finance and Operating Leases (Details) - ARS ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Finance leases Abstract |  |  |
Non-accrued Interest Leases | $ 14,325,000 | $ 651,732,000 | $ 731,956,000
Accumulated Allowances for Loan Losses | 41,622,000 | 89,575,000 | $ 67,076,000
Operating Leases Abstract |  |  |
Operating Lease Expenses | $ 939,607,000 | $ 771,473,000 |

X
- Definition The amount accumulated allowances for loan losses risk. + References No definition available. + Details
Name: | bfr_Accumulatedallowancesforloanlossesrisk
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The amount of non-accrued interest leases. + References No definition available. + Details
Name: | bfr_Nonaccruedinterestleases
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of operating lease expenses recognized in profit or loss. + References No definition available. + Details
Name: | bfr_Operatingleaseexpenses
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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