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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 | $ 6,686,244 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | [1] | $ 6,148,298 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | [1] |
Interest which would have been recorded if the loans had not been in a non-accrual status | 191 blx_InterestIncomeCollectedBeingNotInNonAccuralStatus |  | 67 blx_InterestIncomeCollectedBeingNotInNonAccuralStatus |  | 0 blx_InterestIncomeCollectedBeingNotInNonAccuralStatus
Interest income collected on non-accruing loans | 6 blx_InterestIncomeCollectedOnNonAccruingLoans |  | 0 blx_InterestIncomeCollectedOnNonAccruingLoans |  | 2,288 blx_InterestIncomeCollectedOnNonAccruingLoans
Nonperforming Financing Receivable [Member] |  |  |  |  |
Loans |  |  |  |  |
Loans | 4,034 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 3,125 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Private Corporation [Member] |  |  |  |  |
Loans |  |  |  |  |
Loans | 3,120,005 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember | [1] | 2,375,178 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember | [1] |
Private Corporation [Member] | Nonperforming Financing Receivable [Member] |  |  |  |  |
Loans |  |  |  |  |
Loans | 3,125 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 3,125 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateCorporationMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Private Middle Market Companies [Member] |  |  |  |  |
Loans |  |  |  |  |
Loans | 483,348 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember | [1] | 574,107 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember | [1] |
Private Middle Market Companies [Member] | Nonperforming Financing Receivable [Member] |  |  |  |  |
Loans |  |  |  |  |
Loans | $ 909 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | $ 0 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = blx_PrivateMiddleMarketCompaniesMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |  | $ 0 us-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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- 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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