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Trading liabilities (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total | $ (393)us-gaap_DerivativeGainLossOnDerivativeNet | $ 3,479 us-gaap_DerivativeGainLossOnDerivativeNet | $ 11,461 us-gaap_DerivativeGainLossOnDerivativeNet
Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total | (60)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember | (9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember | (310)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember
Cross Currency Swaps [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CrossCurrencySwapsMember | 67 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CrossCurrencySwapsMember | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CrossCurrencySwapsMember
Cross Currency Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total | 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CrossCurrencyInterestRateSwapMember | 3,236 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CrossCurrencyInterestRateSwapMember | 11,537 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CrossCurrencyInterestRateSwapMember
Forward Foreign Exchange [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total | (333)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_ForwardForeignExchangeMember | (6)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_ForwardForeignExchangeMember | 27 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_ForwardForeignExchangeMember
Future [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Total | $ 0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FutureMember | $ 191 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FutureMember | $ 207 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FutureMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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