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Accumulated other comprehensive income (loss) (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	$ 1,066us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	[1]	$ (522)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	[1]	$ 11,202us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	[1]
Derivative Financial Instruments, Assets [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	(1,264)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		(1,985)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		(5,427)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	2,330us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember	[1]	1,487us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember	[1]	5,775us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember	[1]
Foreign Currency Translation Adjustment Net Of Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember	[1]	(24)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember	[1]	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember	[1]
Foreign Currency Translation Adjustment Net Of Hedges [Member] | Segment, Discontinued Operations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income			(24)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember		0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember
Designated as Hedging Instrument [Member] | Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	532us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		333us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Interest Income [Member] | Derivative Financial Instruments, Assets [Member] | Foreign Exchange Forward [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	(2,245)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember		(1,472)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember		(564)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember
Interest Income [Member] | Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestIncomeMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Interest Expense [Member] | Derivative Financial Instruments, Assets [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember		31us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember		(169)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_InterestExpenseMember
Gain Loss On Sale Of Available-for-sale Securities [Member] | Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	1,796us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_IncomeStatementLocationAxis = blx_GainLossOnSaleOfAvailableforsaleSecuritiesMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		1,152us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_IncomeStatementLocationAxis = blx_GainLossOnSaleOfAvailableforsaleSecuritiesMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		5,775us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_IncomeStatementLocationAxis = blx_GainLossOnSaleOfAvailableforsaleSecuritiesMember / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Foreign Currency Gain (Loss) [Member] | Derivative Financial Instruments, Assets [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for (gains) loss included in net income	$ 981us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember		$ (544)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember		$ 6,160us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember
[1] (1) Reclassification adjustments include amounts recognized in net income during the current period that had been part of other comprehensive income (loss) in this and previous periods.

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