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Sale of the asset management unit and discontinued operations (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Fees and commissions, net |  | $ 17,502 us-gaap_FeesAndCommissions | $ 13,669 us-gaap_FeesAndCommissions | $ 10,021 us-gaap_FeesAndCommissions
Gain (Loss) on Disposition of Assets, Total | 455 us-gaap_GainLossOnDispositionOfAssets1 |  |  |
Investment fund trading [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Fees and commissions, net |  |  | $ 567 us-gaap_FeesAndCommissions / us-gaap_StatementScenarioAxis = blx_InvestmentFundsMember | $ 2,588 us-gaap_FeesAndCommissions / us-gaap_StatementScenarioAxis = blx_InvestmentFundsMember

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- Definition Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 + Details
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- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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