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Capital and Reserves (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of share capital, reserves and other equity interest [Abstract]
Dynamic provision	$ 108,756	$ 43,826
Regulatory reserve	20,498	18,633
Reserve for credit risk coverage	$ 129,254	$ 62,459

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- References

No definition available.

+ Details

Name:	blx_DisclosureOfShareCapitalReservesAndOtherEquityInterestAbstract
Namespace Prefix:	blx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the amount of dynamic provision.

+ References

No definition available.

+ Details

Name:	blx_DynamicProvision
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

The reserve for credit risk coverage.

+ References

No definition available.

+ Details

Name:	blx_ReserveForCreditRiskCoverage
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- 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 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

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