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Accumulated other comprehensive income (loss) (Details) (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]
Balance	$ (12,575)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		$ (730)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		$ (3,112)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Net unrealized gains arising from the year	411us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax		(11,942)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax		14,135us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
Reclassification adjustment for (gains) loss included in net income	(1,066)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	[1]	522us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	[1]	(11,202)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	[1]
Foreign currency translation adjustment, net	(655)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax		(425)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax		(551)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Other comprehensive income (loss) from the year	(1,310)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent		(11,845)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent		2,382us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Balance	(13,885)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		(12,575)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax		(730)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(10,194)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		933us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		(1,728)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Net unrealized gains arising from the year	2,224us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		(9,640)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		8,436us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Reclassification adjustment for (gains) loss included in net income	(2,330)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember	[1]	(1,487)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember	[1]	(5,775)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember	[1]
Foreign currency translation adjustment, net	0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Other comprehensive income (loss) from the year	(106)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		(11,127)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		2,661us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Balance	(10,300)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		(10,194)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember		933us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Derivative Financial Instruments, Assets [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(685)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		(368)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		(640)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Net unrealized gains arising from the year	(1,813)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		(2,302)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		5,699us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Reclassification adjustment for (gains) loss included in net income	1,264us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember	[1]	1,985us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember	[1]	(5,427)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember	[1]
Foreign currency translation adjustment, net	0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		0us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Other comprehensive income (loss) from the year	(549)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		(317)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		272us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Balance	(1,234)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		(685)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember		(368)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_DerivativeFinancialInstrumentsAssetsMember
Foreign Currency Translation Adjustment Net Of Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,696)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		(1,295)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		(744)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember
Net unrealized gains arising from the year	0us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		0us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		0us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember
Reclassification adjustment for (gains) loss included in net income	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember	[1]	24us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember	[1]	0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember	[1]
Foreign currency translation adjustment, net	(655)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		(425)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		(551)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember
Other comprehensive income (loss) from the year	(655)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		(401)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		(551)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember
Balance	$ (2,351)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		$ (1,696)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember		$ (1,295)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = blx_ForeignCurrencyTranslationAdjustmentNetOfHedgesMember
[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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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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