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Investment funds (Details Textual) (USD $) | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Alpha 4X Feeder Fund [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Equity Participation In Percentage |  | 49.61%blx_EquityParticipationInPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xFeederFundMember | 55.87%blx_EquityParticipationInPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xFeederFundMember
Variable Interest Entity Investment Redemption Amount | $ 13,900,000 blx_VariableInterestEntityInvestmentRedemptionAmount / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xFeederFundMember |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount | 49,400,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xFeederFundMember |  |
Alpha4X Latam Fundo de Investimento Multimercado [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Redeemable Noncontrolling Interest, Equity, Carrying Amount | $ 565,000 us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = blx_Alpha4xLatamFundoDeInvestimentoMultimercadoMember |  |

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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 + Details
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