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Equipment and leasehold improvements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Leasehold improvements $ 7,462us-gaap_LeaseholdImprovementsGross $ 7,414us-gaap_LeaseholdImprovementsGross  
Furniture and equipment 16,870blx_FurnitureAndEquipment 16,933blx_FurnitureAndEquipment  
Property, Plant and Equipment, Gross 24,332us-gaap_PropertyPlantAndEquipmentGross 24,347us-gaap_PropertyPlantAndEquipmentGross  
Less: accumulated depreciation and amortization 16,203us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 13,881us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, Plant and Equipment, Net $ 8,129us-gaap_PropertyPlantAndEquipmentNet $ 10,466us-gaap_PropertyPlantAndEquipmentNet $ 12,808us-gaap_PropertyPlantAndEquipmentNet