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Cash and stock-based compensation plans (Details) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
First Year [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Vesting Percentage | 35.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_FirstYearMember | 35.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_FirstYearMember | 25.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_FirstYearMember
Second Year [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Vesting Percentage | 35.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_SecondYearMember | 35.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_SecondYearMember | 25.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_SecondYearMember
Third Year [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Vesting Percentage | 30.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_ThirdYearMember | 30.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_ThirdYearMember | 25.00%blx_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockVestingPercentage / us-gaap_AwardDateAxis = blx_ThirdYearMember

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- Definition Represents the percentage of shares vesting on each grant's date anniversary. + References No definition available. + Details
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