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Applicable laws and regulations (Details 6) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statutory reserve	$ 136,019	$ 136,019
Dynamic Provision [Member]
Statutory reserve	136,019	136,019
Regulatory Credit Reserve [Member]
Statutory reserve	$ 0	$ 0

X

- Definition

A component of equity representing reserves created based on legal requirements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_StatutoryReserve
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_ReservesWithinEquityAxis=blx_DynamicProvisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ReservesWithinEquityAxis=blx_RegulatoryCreditReserveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: