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Financial instruments (Details 12) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosures of financials instrument [Abstract]
Assignments and Participations	$ 77,400	$ 157,242	$ 92,438
Gains	$ 181	$ 730	$ 422

X

- Definition

The assignments and participation of financial instruments.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The gain, recognised in the statement of comprehensive income, that arises from the derecognition of financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 20A
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_20A&doctype=Standard
-URIDate 2017-03-09

+ Details

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