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Capital and Reserves (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of share capital, reserves and other equity interest [Abstract] |  |
Description of minimum capital adequacy ratio | 8.00% |
Description of primary capital requirement | 4.50% |
Description of total capital adequacy ratio | 18.71% |
Reserve for credit risk coverage | $ 129,254 | $ 62,459

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- Definition The minimum capital adequacy index. + References No definition available. + Details
Name: | blx_DescriptionOfMinimumCapitalAdequacyRatio
Namespace Prefix: | blx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The primary capital requirements. + References No definition available. + Details
Name: | blx_DescriptionOfPrimaryCapitalRequirement
Namespace Prefix: | blx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The total capital adequacy index. + References No definition available. + Details
Name: | blx_DescriptionOfTotalCapitalAdequacyRatio
Namespace Prefix: | blx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | blx_DisclosureOfShareCapitalReservesAndOtherEquityInterestAbstract
Namespace Prefix: | blx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The reserve for credit risk coverage. + References No definition available. + Details
Name: | blx_ReserveForCreditRiskCoverage
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant