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New accounting standards - (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about hedges [line items]
Nominal value	$ 783,017	$ 965,673
Cash flow hedging relationship
Disclosure of detailed information about hedges [line items]
Nominal value	$ 20,000

X

- Definition

Nominal amount of hedging instrument

+ References

No definition available.

+ Details

Name:	blx_NominalAmountOfHedgingInstrument1
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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_DisclosureOfHedgeAccountingLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_TypesOfHedgesAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: