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Financial instruments with off-balance sheet credit risk (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	$ 386,118blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk	$ 480,423blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk
Argentina [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	0blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = stpr_AR	295blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = stpr_AR
Bolivia [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	0blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_BO	80blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_BO
Brazil [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	19,698blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_BR	22,567blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_BR
Chile [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	27,802blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_CL	0blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_CL
Colombia [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	53,874blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = stpr_CO	38,545blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = stpr_CO
Costa Rica [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	0blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_CR	897blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_CR
Dominican Republic [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	14,806blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_DO	108blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_DO
Ecuador [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	86,436blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_EC	153,072blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_EC
El Salvador [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	25blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_SV	25blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_SV
Guatemala [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	37,988blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_GT	43,548blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_GT
Honduras [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	412blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_HN	412blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_HN
Jamaica [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	415blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_JM	338blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_JM
Mexico [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	64,324blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_MX	20,969blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_MX
Netherlands [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	0blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_NL	17,833blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_NL
Panama [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	20,675blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = stpr_PA	96,943blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = stpr_PA
Paraguay [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	418blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_PY	2blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_PY
Peru [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	16,225blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_PE	41,063blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_PE
Switzerland [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	1,000blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_CH	1,000blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_CH
United Kingdom [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	0blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_GB	70blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_GB
Uruguay [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	40,946blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_UY	40,946blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_UY
Venezuela [Member]
Off-balance Sheet Risks [Line Items]
Financial Instruments With Off-Balance Sheet Credit Risk	$ 1,074blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_VE	$ 1,710blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk / blx_AllCountriesAxis = country_VE

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- Definition

The total amount of instruments with off-balance sheet credit risk at the reporting date.

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