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Loans (Details) (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]
Private Corporation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,120,005us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember	[1]	2,375,178us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember	[1]
State Owned Corporation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	711,955us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_StateOwnedCorporationMember	[1]	938,878us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_StateOwnedCorporationMember	[1]
Private Banking and financial Institutions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,890,605us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateBankingAndFinancialInstitutionsMember	[1]	1,785,798us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateBankingAndFinancialInstitutionsMember	[1]
State Owned Banking and financial Institutions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	480,331us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_StateOwnedBankingandfinancialInstitutionsMember	[1]	474,193us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_StateOwnedBankingandfinancialInstitutionsMember	[1]
Private Middle Market Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	483,348us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember	[1]	574,107us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember	[1]
Sovereign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_SovereignMember	[1]	$ 144us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_SovereignMember	[1]
[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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