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Deposits - Schedule of additional information regarding the bank's deposits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deposits |  |  |
Aggregate amount of $100,000 or more | $ 3,035,906 | $ 3,138,684 |
Aggregate amount of deposits in the New York Agency | 515,852 | 657,851 |
Interest expense on deposits made in the New York Agency | $ 3,852 | $ 5,035 | $ 6,277

X
- Definition The aggregate amounts of deposits in New York Agency. + References No definition available. + Details
Name: | blx_AggregateAmountsOfDepositsInNewYorkAgency
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The amount of interest expense paid to deposits in the new york agency. + References No definition available. + Details
Name: | blx_InterestExpensePaidToDepositsInNewYorkAgency
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more. + References No definition available. + Details
Name: | blx_TimeDeposits100000OrMoreFromCustomer
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant