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Financial instruments with off-balance sheet credit risk (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Within 1 year | $ 219,421
From 1 to 2 years | 1,000
From 2 to 5 years | 13,791
After 5 years | 664
Maturity Of Banks Outstanding Financial Instruments With Off Balance Sheet Credit Risk | $ 234,876

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- 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