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Financial instruments with off-balance sheet credit risk (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Off-balance Sheet Risks [Line Items]
Within 1 year	$ 292,720blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRiskMaturityWithInYearOne3
From 1 to 2 years	41,269blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRiskMaturityFromOneToTwoYeaars
From 2 to 5 years	51,551blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRiskMaturityFromTwoToFiveYeaars
More than 5 years	578blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRiskMaturityAfterYearFive
Maturity Of Banks Outstanding Financial Instruments With Off Balance Sheet Credit Risk	$ 386,118blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRisk

X

- Definition

It represent Banks outstanding financial instruments with off-balance sheet credit risk.

+ References

No definition available.

+ Details

Name:	blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRisk
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

It represent Banks outstanding financial instruments with off-balance sheet credit risk, maturity after five years.

+ References

No definition available.

+ Details

Name:	blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRiskMaturityAfterYearFive
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

It represent Banks outstanding financial instruments with off-balance sheet credit risk, maturity From one To Two years.

+ References

No definition available.

+ Details

Name:	blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRiskMaturityFromOneToTwoYeaars
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

It represent Banks outstanding financial instruments with off-balance sheet credit risk, maturity From Two To Five years.

+ References

No definition available.

+ Details

Name:	blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRiskMaturityFromTwoToFiveYeaars
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

It represent Banks outstanding financial instruments with off-balance sheet credit risk, maturity within year one.

+ References

No definition available.

+ Details

Name:	blx_BanksOutstandingFinancialInstrumentsWithOffBalanceSheetCreditRiskMaturityWithInYearOne3
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	blx_OffbalanceSheetRisksLineItems
Namespace Prefix:	blx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration