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Fair value of financial instruments (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Fair value of financial instruments [Line Items]
Allowance for expected credit losses	$ 81,294	$ 105,988	$ 89,974
Unearned interest and deferred fees	(4,985)	(7,249)
Securities [Member]
Disclosure of Fair value of financial instruments [Line Items]
Allowance for expected credit losses	$ 196	$ 602

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- References

No definition available.

+ Details

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Namespace Prefix:	blx_
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Balance Type:	na
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- Definition

The amount of unearned interest and deferred fees.

+ References

No definition available.

+ Details

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- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B
-URIDate 2017-03-09

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Balance Type:	credit
Period Type:	instant

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