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Derivative financial instruments for hedging purposes (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Maximum Length of Time Hedged in Price Risk Cash Flow Hedge | 1 year 10 months 20 days
Foreign Exchange Forward [Member] |
Cash Flow Hedge Gain Reclassified to Interest Expense | 42,000
Cash flow hedge loss reclassified to interest income | 82,000

X
- Definition The amount of gains on a cash flow hedge to be reclassified to interest expense from accumulated other comprehensive income. + References No definition available. + Details
Name: | blx_ExpectedCashFlowHedgeGainReclassifiedToInterestExpense
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of losses on a cash flow hedge to be reclassified to interest income from accumulated other comprehensive income. + References No definition available. + Details
Name: | blx_ExpectedCashFlowHedgeLossReclassifiedToInterestIncome
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
Name: | us-gaap_MaximumLengthOfTimeHedgedInPriceRiskCashFlowHedge1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration