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Leasehold commitments (Details Textual) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Leasehold Commitments [Line Items]
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	$ 2,063us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals

X

- Details

Name:	blx_LeaaseholdCommitmentsLineItems
Namespace Prefix:	blx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant