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Cash and stock-based compensation plans (Details 6) (Stock Option Plan 2006 - Directors and Executives [Member], USD $)	12 Months Ended
	Dec. 31, 2013
Stock Option Plan 2006 - Directors and Executives [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	49,804us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / blx_OptionsAxis = blx_StockOptionPlanTwoThousandSixDirectorsAndExecutivesMember
Forfeited Options	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / blx_OptionsAxis = blx_StockOptionPlanTwoThousandSixDirectorsAndExecutivesMember
Exercised Options	(49,804)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / blx_OptionsAxis = blx_StockOptionPlanTwoThousandSixDirectorsAndExecutivesMember
Options Outstanding	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / blx_OptionsAxis = blx_StockOptionPlanTwoThousandSixDirectorsAndExecutivesMember
Outstanding weighted average exercise price	$ 16.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / blx_OptionsAxis = blx_StockOptionPlanTwoThousandSixDirectorsAndExecutivesMember
Forfeited Weighted average exercise price	$ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / blx_OptionsAxis = blx_StockOptionPlanTwoThousandSixDirectorsAndExecutivesMember
Exercised Weighted average exercise price	$ 16.34us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / blx_OptionsAxis = blx_StockOptionPlanTwoThousandSixDirectorsAndExecutivesMember

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-Publisher FASB

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-Topic 718

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-Section 50

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-Subparagraph (c)(1)(iv)(2)

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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 02

-Paragraph 29, 30

-Article 5

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