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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 | $ 6,686,244 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | [1] | $ 6,148,298 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | [1]
Loan Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 8,835 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember |  | 3,125 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember |
Current Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 6,677,409 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |  | 6,145,173 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |
Delinquent Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 4,801 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_DelinquentLoanMember |  | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_DelinquentLoanMember |
Delinquent Loan [Member] | Loan Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_DelinquentLoanMember |  | 3,125 us-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 | 4,034 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_PastDueBalancesMember |  | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_PastDueBalancesMember |
Past Due Balances [Member] | Loan Impairment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 4,034 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = blx_LoanImpairmentMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_PastDueBalancesMember |  | 0 us-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 | 947,624 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_UpToOneMonthMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |  | 1,017,794 us-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 | 1,502,905 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromOneMonthToThreeMonthsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |  | 1,749,348 us-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 | 1,268,478 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromThreeMonthsToSixMonthsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |  | 949,364 us-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 | 1,067,073 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromSixMonthsToOneYearMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |  | 774,803 us-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 | 989,805 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromOneYearToTwoYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |  | 942,327 us-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 | 870,163 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromTwoYearsToFiveYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |  | 711,537 us-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 | $ 31,361 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / blx_LoanMaturitiesAxis = blx_FromTwoYearsToThreeYearsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CurrentLoanMember |  | $ 0 us-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 + Details
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