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v3.21.1

Derivative financial instruments (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Derivative financial instruments |  |
Cost of hedging to be reclassified to profit or loss - Loans hedging | $ 508 |
Description of duration of hedging, financial assets |  | 7 years

X
- Definition The description of duration of hedging financial assets. + References No definition available. + Details
Name: | blx_DescriptionOfDurationOfHedgingFinancialAssets
Namespace Prefix: | blx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The interest income yield on hedged loans. + References No definition available. + Details
Name: | blx_InterestIncomeHedgedLoans
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration