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

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

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