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Note 10 - Financial Assets at Amortised Cost - Loans and Advances to Financial Institutions (Details) - ARS ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Loans and Advances to Banks Abstract |  |  |  |  |
Gross Loans and Advances to Financial Institutions | $ 9,669,331,000 | $ 6,772,988,000 |  | $ 4,949,295,000 |
Allowances for Loan Losses of Loans and Advances to Financial Institutions | (33,486,000) | (49,296,000) | [1] | (31,254,000) | [1]
Loans and Advances to Financial Institutions | $ 9,635,845,000 | $ 6,723,692,000 |  | $ 4,918,041,000 |
[1] | The Bank calculated the allowance for loan losses in accordance with IAS 39.

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- Definition The amount of an allowance account used to loans and advances to financial institutions. + References No definition available. + Details
Name: | bfr_Allowancesforloanlossesforloansfinancialinstitutions
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of Gross Loans and Advances to Financial Institutions. + References No definition available. + Details
Name: | bfr_Grossloansandadvancestobanks
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition The amount of loans and advances the entity has made to banks. + 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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant