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Deposits (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deposits
Aggregate amounts of $100,000 or more	$ 3,138,684	$ 2,888,043
Aggregate amounts of deposits in the New York Agency	657,851	240,003
Interest expense on deposits made in the New York Agency	$ 5,035	$ 6,277	$ 5,937

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

X

- 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