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Financial instruments with off-balance sheet credit risk (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Off-balance Sheet Risks [Line Items] |  |
Confirmed letters of credit | $ 221,963 | $ 106,415
Stand-by letters of credit and guarantees - Commercial risk | 137,285 | 25,167
Credit commitments | 121,175 | 103,294
Financial Instruments With Off-Balance Sheet Credit Risk | $ 480,423 | $ 234,876

X
- Definition It represents the outstanding credit commitments issued by the Bank. + References No definition available. + Details
Name: | blx_CreditCommitments
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of instruments with off-balance sheet credit risk at the reporting date. + References No definition available. + Details
Name: | blx_FinancialInstrumentsWithOffBalanceSheetCreditRisk
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | blx_OffbalanceSheetRisksLineItems
Namespace Prefix: | blx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the letters of credit with the commercial risk. + References No definition available. + Details
Name: | blx_StandbyLettersOfCreditAndGuaranteesCommercialRisk
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant