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Note 40 - Financial Instruments Risks - Progress of LCR Ratios (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Progress of LCR Ratios Abstract |  |  |
Liquidity Coverage Ratios | 291.00% | 289.00% | 519.00%

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- Definition The relation between high quality liquid assets and total net cash outflows during a 30 day period. + References No definition available. + Details
Name: | bfr_Lcr
Namespace Prefix: | bfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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