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Financial instruments (Details 20) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Interest income on credit impairment [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Interest revenue calculated on the net carrying amount(net of credit allowance) | $ 1,170 | $ 1,808 | $ 91

X
- Definition The amount of income arising from interest on net carrying amount. + References No definition available. + Details
Name: | blx_InterestRevenuenetCarryingAmount
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ImpairmentOfFinancialAssetsAxis=blx_InterestIncomeOnCreditImpairmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |