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Loans (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,686,244us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	[1]	$ 6,148,298us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	[1]
Banking and financial institutions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,370,936us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_PrivateBankingAndFinancialInstitutionsMember		2,259,991us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_PrivateBankingAndFinancialInstitutionsMember
Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,325,091us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_IndustrialMember		936,290us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_IndustrialMember
Oil and Petroleum Derived Products [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,013,324us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_OilAndPetroleumDerivedProductsMember		1,170,684us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_OilAndPetroleumDerivedProductsMember
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,132,330us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_AgricultureMember		924,251us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_AgricultureMember
Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	617,366us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_ServiceMember		398,736us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_ServiceMember
Mining Properties and Mineral Rights [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	38,572us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = us-gaap_MiningPropertiesAndMineralRightsMember		10,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = us-gaap_MiningPropertiesAndMineralRightsMember
Sovereign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_SovereignMember		144us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_SovereignMember
Other Industry [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 188,625us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_OtherIndustryMember		$ 448,202us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis = blx_OtherIndustryMember
[1] Current ratings as of December 31, 2014 and 2013, respectively.

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

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