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Financial risk - Carrying amount for the bank’s loans and securities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of credit risk exposure [abstract] |  |
Loan portfolio at amortized cost and investment portfolio less than/equal to 1 year according to its original terms | $ 3,426 | $ 3,114
Average term (days) | 191 days | 195 days
Loan portfolio at amortized cost and investment portfolio greater than/equal to 1 year according to its original terms | $ 3,134 | $ 2,193
Average term (days) | 1365 days | 1382 days

X
- Definition Average Term of Medium Term Maturing of Loan and Investment Portfolio + References No definition available. + Details
Name: | blx_AverageTermOfMediumTermMaturingOfLoanAndInvestmentPortfolio
Namespace Prefix: | blx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The period of maturing of loan and investment portfolios. + References No definition available. + Details
Name: | blx_AverageTermOfShortTermMaturingOfLoanAndInvestmentPortfolio
Namespace Prefix: | blx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of loan and investment portfolio original investments maturing greater than one year. + References No definition available. + Details
Name: | blx_LoanAndInvestmentPortfolioMaturingGreaterThanOneYear
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of loan and investment portfolio original investments maturing less than one year. + References No definition available. + Details
Name: | blx_LoanAndInvestmentPortfolioMaturingLessThanOneYear
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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