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Note 29 - Net Interest Income - Interest Expenses (Details) - ARS ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Interest Expenses Abstract |  |  |
Interest Expense from Savings Accounts Deposits |  | $ (4,386,444) | $ (892,507)
Interest Expense from Time Deposits |  | (16,986,001) | (10,009,766)
Interest Expense from Bank Loans |  | (183,209) | (54,636)
Interest Expense from Other Liabilities |  | (1,777,276) | (739,176)
Interest Expense from Premiums for Reverse Repurchase Agreements |  | (110,197) | (195,477)
Interest Expense from (UVA) Clause Adjustments | [1] | (1,283,502) | (65,655)
Other Interest Expenses |  | (11,599) | (2,108)
Total Interest Expenses |  | $ (24,738,228,000) | $ (11,959,325,000)
[1] | Adjustment clause based on the variation of the consumer price index.

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- Definition The amount of interest expense on acquisition value unit (UVA) clause adjustment. + References No definition available. + Details
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Balance Type: | debit
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- Definition The amount of interest expense on reverse repurchase agreements and cash collateral on securities borrowed. + References No definition available. + Details
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Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- References No definition available. + Details
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- Definition Other amounts of expense arising from interest. + References No definition available. + Details
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Balance Type: | debit
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- Definition The amount of interest expense on savings accounts. + References No definition available. + Details
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- Definition The amount of interest expense on time deposits. + References No definition available. + Details
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- Definition The amount of expense arising from interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_d&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_e&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_f&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of interest expense on bank loans and overdrafts. [Refer: Interest expense; Bank overdrafts] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of interest expense on other financial liabilities. [Refer: Interest expense; Other financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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