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Document And Entity Information
 12 Months Ended
Dec. 31, 2017
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus FY
Entity Registrant Name FOREIGN TRADE BANK OF LATIN AMERICA, INC.
Entity Central Index Key 0000890541
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Trading Symbol BLX
Entity Common Stock, Shares Outstanding 39,428,835
Class A Common Stock [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 6,342,189
Class B Common Stock [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 2,408,806
Class E Common Stock [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 30,677,840
Class F Common Stock [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 0