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Loans (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Loans
Loans	$ 6,686,244us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	[1]	$ 6,148,298us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	[1]
Interest which would have been recorded if the loans had not been in a non-accrual status	191blx_InterestIncomeCollectedBeingNotInNonAccuralStatus		67blx_InterestIncomeCollectedBeingNotInNonAccuralStatus		0blx_InterestIncomeCollectedBeingNotInNonAccuralStatus
Interest income collected on non-accruing loans	6blx_InterestIncomeCollectedOnNonAccruingLoans		0blx_InterestIncomeCollectedOnNonAccruingLoans		2,288blx_InterestIncomeCollectedOnNonAccruingLoans
Nonperforming Financing Receivable [Member]
Loans
Loans	4,034us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember		3,125us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember		0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Private Corporation [Member]
Loans
Loans	3,120,005us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember	[1]	2,375,178us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember	[1]
Private Corporation [Member] | Nonperforming Financing Receivable [Member]
Loans
Loans	3,125us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember		3,125us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember		0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Private Middle Market Companies [Member]
Loans
Loans	483,348us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember	[1]	574,107us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember	[1]
Private Middle Market Companies [Member] | Nonperforming Financing Receivable [Member]
Loans
Loans	$ 909us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember		$ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember		$ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
[1] Current ratings as of December 31, 2014 and 2013, respectively.

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Interest income collected being not in non accrual status during the period.

+ References

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- Definition

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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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