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Investment funds (Details Textual)	Dec. 31, 2013
Bladex Offshore Feeder Fund [Member]
Schedule of Investments [Line Items]
Interest Percentage In Investments Funds	98.74%
Alpha 4X Feeder Fund [Member]
Schedule of Investments [Line Items]
Equity Participation In Percentage	55.87%
Bladex Latam Fund [Member]
Schedule of Investments [Line Items]
Interest Percentage In Investments Funds	92.38%

X

- Definition

Represents the participation percentage on equity investments to be accounted for under the equity method.

+ References

No definition available.

+ Details

Name:	blx_EquityParticipationInPercentage
Namespace Prefix:	blx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the value of interest percentage in investments funds for during period.

+ References

No definition available.

+ Details

Name:	blx_InterestPercentageInInvestmentsFunds
Namespace Prefix:	blx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration