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Loans (Details 3) (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]
Loan Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,835us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember		3,125us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember
Current Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,677,409us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember		6,145,173us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember
Delinquent Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,801us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_DelinquentLoanMember		0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_DelinquentLoanMember
Delinquent Loan [Member] | Loan Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_DelinquentLoanMember		3,125us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_DelinquentLoanMember
Past Due Balances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,034us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_PastDueBalancesMember		0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_PastDueBalancesMember
Past Due Balances [Member] | Loan Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,034us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_PastDueBalancesMember		0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_PastDueBalancesMember
Up To One Month [Member] | Current Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	947,624us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_UpToOneMonthMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember		1,017,794us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_UpToOneMonthMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember
From One Month To Three Months [Member] | Current Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,502,905us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromOneMonthToThreeMonthsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember		1,749,348us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromOneMonthToThreeMonthsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember
From Three Months To Six Months [Member] | Current Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,268,478us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromThreeMonthsToSixMonthsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember		949,364us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromThreeMonthsToSixMonthsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember
From Six Months To One Year [Member] | Current Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,067,073us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromSixMonthsToOneYearMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember		774,803us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromSixMonthsToOneYearMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember
From One Year To Two Years [Member] | Current Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	989,805us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromOneYearToTwoYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember		942,327us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromOneYearToTwoYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember
From Two Years To Five Years [Member] | Current Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	870,163us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromTwoYearsToFiveYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember		711,537us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromTwoYearsToFiveYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember
From Five Years to Seven Years [Member] | Current Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 31,361us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromTwoYearsToThreeYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember		$ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromTwoYearsToThreeYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember
[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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