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Cash and cash equivalents (Details Textual) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Line Items]
Pledged deposits	$ 10.9us-gaap_DepositAssets	$ 6.0us-gaap_DepositAssets
New York Agency [Member] | New York State Banking Department [Member]
Cash and Cash Equivalents [Line Items]
Pledged deposits	$ 3.0us-gaap_DepositAssets / blx_PledgeeAxis = blx_NewYorkStateBankingDepartmentMember / blx_PledgorAxis = blx_NewYorkAgencyMember	$ 3.0us-gaap_DepositAssets / blx_PledgeeAxis = blx_NewYorkStateBankingDepartmentMember / blx_PledgorAxis = blx_NewYorkAgencyMember

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Definition

The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 8

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.8,17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

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