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Note 40 - Financial Instruments Risks - Sensitivity of the Economic Value SEV (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEV Given a Variation of 100 Basis Points with Respect to Core Capital Abstract |  |  |
Closing SEV | 1.43% | 1.53% | 1.03%
Minimum SEV | 1.01% | 0.80% | 0.68%
Maximum SEV | 2.05% | 1.65% | 1.33%
Average SEV | 1.61% | 1.13% | 0.94%

X
- Definition Average SEV given a variation of 100 basis points with respect to Core Capital. + References No definition available. + Details
Name: | bfr_Averagesev
Namespace Prefix: | bfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Closing SEV given a variation of 100 basis points with respect to Core Capital. + References No definition available. + Details
Name: | bfr_Closingsev
Namespace Prefix: | bfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum SEV given a variation of 100 basis points with respect to Core Capital. + References No definition available. + Details
Name: | bfr_Maximumsev
Namespace Prefix: | bfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum SEV given a variation of 100 basis points with respect to Core Capital. + References No definition available. + Details
Name: | bfr_Minimumsev
Namespace Prefix: | bfr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | bfr_Sensitivityoftheeconomicvaluegivenavariationof100basispointsabstract
Namespace Prefix: | bfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration