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Financial instruments (Details 12) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition The assignments and participation of financial instruments. + References No definition available. + Details
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Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | blx_DisclosuresOfFinancialsInstrumentAbstract
Namespace Prefix: | blx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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