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Related party transactions (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related party transactions
Compensation costs paid to directors	$ 2,033	$ 2,289	$ 2,331
Compensation costs paid to executives	$ 5,448	$ 3,244	$ 4,943

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