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Related party transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of related party [Abstract] |  |  |
Compensation costs paid to directors | $ 884 | $ 880 | $ 949
Compensation costs paid to executives | $ 2,370 | $ 4,055 | $ 4,601

X
- Definition The amount of compensation cost paid to directors. + References No definition available. + Details
Name: | blx_CompensationCostPaidToDirectors
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of compensation cost paid to executives. + References No definition available. + Details
Name: | blx_CompensationCostPaidToExecutives
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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