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Applicable laws and regulations (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Cash [abstract]
Capital funds	$ 1,048,182	$ 1,026,125
Risk-weighted assets	$ 5,187,054	$ 5,937,648
Capital adequacy index	20.21%	17.28%

X

- Definition

Tier 1 Risk Based Capital as defined in the regulations.

+ References

No definition available.

+ Details

Name:	blx_TierOneCapital
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Tier 1 capital divided by risk weighted assets

+ References

No definition available.

+ Details

Name:	blx_TierOneRiskBasedCapitalRatio
Namespace Prefix:	blx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Tier 1 Risk weighted assets as defined in the regulations.

+ References

No definition available.

+ Details

Name:	blx_TierOneRiskWeightedAssets
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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