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Note 48 - Minimum Cash and Minimum Capital - Minimum Capital Requirement For Credit Risk (Details) | 12 Months Ended
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Dec. 31, 2018
Minimum Capital Abstract |
Item of Minimum Capital Requeriment For Credit Risk | 8%

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- Definition The amount of minimum capital requirement for credit risk, percent of the sum of credit-risk-weighted asset transactions without delivery against payment. + References No definition available. + Details
Name: | bfr_Itemofminimumcapitalrequerimentforcreditrisk
Namespace Prefix: | bfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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