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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