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Long-term borrowings and debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Borrowings:
At fixed interest rates with due dates from june 2015 to november 2016	$ 65,000blx_BorrowingsAtFixedInterestRatesWithDueDatesInJune2015	$ 25,000blx_BorrowingsAtFixedInterestRatesWithDueDatesInJune2015
At floating interest rates with due dates from may 2015 to november 2019	578,956blx_BorrowingsAtFixedInterestRatesWithDueDatesFromMarch2014ToDecember2016	506,346blx_BorrowingsAtFixedInterestRatesWithDueDatesFromMarch2014ToDecember2016
Total borrowings	643,956blx_TotalBorrowings	531,346blx_TotalBorrowings
Debt:
At fixed interest rates with due dates from april 2017 to march 2024	464,729blx_LongTermDebtAtFixedInterestRates	444,719blx_LongTermDebtAtFixedInterestRates
At floating interest rates with due dates from march 2015 to january 2018	296,834blx_LongTermDebtAtFloatingInterestRates	177,806blx_LongTermDebtAtFloatingInterestRates
Total debt	761,563us-gaap_LongTermDebtNoncurrent	622,525us-gaap_LongTermDebtNoncurrent
Total long-term borrowings and debt	1,405,519us-gaap_LongTermDebt	1,153,871us-gaap_LongTermDebt
Total long-term borrowings and debt outstanding	1,388,708us-gaap_DebtAndCapitalLeaseObligations	1,317,983us-gaap_DebtAndCapitalLeaseObligations
Maximum outstanding balance at any month - end	1,587,009blx_LongTermDebtMaximumMonthendOutstandingAmount	1,893,149blx_LongTermDebtMaximumMonthendOutstandingAmount
Weighted average interest rate at the end of the period	2.71%us-gaap_LongtermDebtWeightedAverageInterestRate	3.06%us-gaap_LongtermDebtWeightedAverageInterestRate
Weighted average interest rate during the period	2.86%blx_LongTermDebtWeightedAverageInterestRateDuringYear	3.08%blx_LongTermDebtWeightedAverageInterestRateDuringYear
Mexican Pesos [Member]
Debt:
Total long-term borrowings and debt	271,833us-gaap_LongTermDebt / blx_ForeignCurrencyAxis = blx_MexicanPesosMember	242,916us-gaap_LongTermDebt / blx_ForeignCurrencyAxis = blx_MexicanPesosMember
Peruvian Soles [Member]
Debt:
Total long-term borrowings and debt	0us-gaap_LongTermDebt / blx_ForeignCurrencyAxis = blx_PeruvianSolesMember	43,980us-gaap_LongTermDebt / blx_ForeignCurrencyAxis = blx_PeruvianSolesMember
Range of fixed interest rates on borrowing and debt	0.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / blx_ForeignCurrencyAxis = blx_PeruvianSolesMember	6.50%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / blx_ForeignCurrencyAxis = blx_PeruvianSolesMember
U S Dollar [Member]
Debt:
Total long-term borrowings and debt	1,069,421us-gaap_LongTermDebt / blx_ForeignCurrencyAxis = blx_USDollarMember	866,975us-gaap_LongTermDebt / blx_ForeignCurrencyAxis = blx_USDollarMember
Euro [Member]
Debt:
Total long-term borrowings and debt	$ 64,265us-gaap_LongTermDebt / blx_ForeignCurrencyAxis = blx_EuroMember	$ 0us-gaap_LongTermDebt / blx_ForeignCurrencyAxis = blx_EuroMember
Maximum [Member] | Mexican Pesos [Member]
Debt:
Range of floating interest rates on borrowing and debt	3.96%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / blx_ForeignCurrencyAxis = blx_MexicanPesosMember / us-gaap_RangeAxis = us-gaap_MaximumMember	5.29%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / blx_ForeignCurrencyAxis = blx_MexicanPesosMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | U S Dollar [Member]
Debt:
Range of fixed interest rates on borrowing and debt	3.75%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / blx_ForeignCurrencyAxis = blx_USDollarMember / us-gaap_RangeAxis = us-gaap_MaximumMember	3.75%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / blx_ForeignCurrencyAxis = blx_USDollarMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Range of floating interest rates on borrowing and debt	1.76%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / blx_ForeignCurrencyAxis = blx_USDollarMember / us-gaap_RangeAxis = us-gaap_MaximumMember	1.77%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / blx_ForeignCurrencyAxis = blx_USDollarMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member] | Mexican Pesos [Member]
Debt:
Range of floating interest rates on borrowing and debt	3.67%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / blx_ForeignCurrencyAxis = blx_MexicanPesosMember / us-gaap_RangeAxis = us-gaap_MinimumMember	4.44%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / blx_ForeignCurrencyAxis = blx_MexicanPesosMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | U S Dollar [Member]
Debt:
Range of fixed interest rates on borrowing and debt	1.50%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / blx_ForeignCurrencyAxis = blx_USDollarMember / us-gaap_RangeAxis = us-gaap_MinimumMember	1.50%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / blx_ForeignCurrencyAxis = blx_USDollarMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Range of floating interest rates on borrowing and debt	0.72%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / blx_ForeignCurrencyAxis = blx_USDollarMember / us-gaap_RangeAxis = us-gaap_MinimumMember	0.52%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / blx_ForeignCurrencyAxis = blx_USDollarMember / us-gaap_RangeAxis = us-gaap_MinimumMember

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