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Applicable laws and regulations - Schedule of applicable laws and regulations (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Cash [abstract] |  |
Capital funds | $ 1,013,796 | $ 1,048,182
Risk-weighted assets | $ 6,513,267 | $ 5,187,054
Capital adequacy index | 15.57% | 20.21%

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- 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

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- 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

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- 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

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- References No definition available. + Details
Name: | ifrs-full_CashAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration