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Capital adequacy (Details Textual)
Dec. 31, 2014
Capital Adequacy [Line Items]  
Minimum Capital Adequacy Ratio 8.00%blx_MinimumCapitalAdequacyRatio
Primary Capital Adequacy Ratio 4.00%blx_PrimaryCapitalAdequacyRatio
Capital Adequacy Ratio 15.14%blx_CapitalAdequacyRatio