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Financial instruments with off-balance sheet credit risk (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Off-balance Sheet Risks [Line Items]    
Confirmed letters of credit $ 89,752us-gaap_LettersOfCreditOutstandingAmount $ 221,963us-gaap_LettersOfCreditOutstandingAmount
Stand-by letters of credit and guaranteed - Commercial risk 137,817blx_StandbyLettersOfCreditAndGuaranteesCommercialRisk 137,285blx_StandbyLettersOfCreditAndGuaranteesCommercialRisk
Credit commitments 158,549blx_CreditCommitments 121,175blx_CreditCommitments
Financial Instruments With Off-Balance Sheet Credit Risk $ 386,118blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk $ 480,423blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk