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

X

- 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

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