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Other assets (Details Textual) $ in Millions | Dec. 31, 2017 USD ($)
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Disclosure of other assets [Abstract] |
Leasing Property Under Development | $ 1.7

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

X
- Definition The amount of leasing properties representing such assets under development. + References No definition available. + Details
Name: | blx_LeasingPropertyUnderDevelopment
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant