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Derivative financial instruments (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2021
Derivative financial instruments |
Description of duration of hedging, financial assets | 6 years

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- Definition The description of duration of hedging financial assets. + References No definition available. + Details
Name: | blx_DescriptionOfDurationOfHedgingFinancialAssets
Namespace Prefix: | blx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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