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Investment funds (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investment Funds [Line Items]
Investment funds	$ 57,574us-gaap_OtherInvestments	$ 118,661us-gaap_OtherInvestments
Alpha 4X Feeder Fund [Member]
Investment Funds [Line Items]
Investment funds	52,472us-gaap_OtherInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xFeederFundMember	113,069us-gaap_OtherInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xFeederFundMember
Alpha 4X Latam Fundo de Investmento Multimercado [Member]
Investment Funds [Line Items]
Investment funds	$ 5,102us-gaap_OtherInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xLatamFundoDeInvestmentoMultimercadoMember	$ 5,592us-gaap_OtherInvestments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xLatamFundoDeInvestmentoMultimercadoMember

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- Definition

Other investments not otherwise specified in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 12

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(f,g))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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