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