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Financial risk - Bank’s demand deposits (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of credit risk exposure [abstract] |  |
Demand and "overnight" deposits | $ 362 | $ 171
Demand and "overnight" deposits to total deposits | 11.92% | 5.44%
Total liquid assets | $ 1,404 | $ 1,048
Total assets to total liabilities | 46.26% | 33.40%
Total liquid assets in the Federal Reserve of the United States of America | 85.52% | 65.68%

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- Definition The amount of demand liabilities and overnight liabilities. + References No definition available. + Details
Name: | blx_DemandsLiabilitiesAndOvernight
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The percentage of demand and overnight liabilities on total liabilities. + References No definition available. + Details
Name: | blx_DemandsLiabilitiesAndOvernightOfTotalDepositsPercentage
Namespace Prefix: | blx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of liquid assets. + References No definition available. + Details
Name: | blx_LiquidAssets
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The percentage of total assets of a total liabilities. + References No definition available. + Details
Name: | blx_TotalAssetsPercentageOfTotalLiabilities
Namespace Prefix: | blx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of total liquid assets. + References No definition available. + Details
Name: | blx_TotalLiquidAssetsPercentage
Namespace Prefix: | blx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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