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Securities and other financial assets, net (Details Textuals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Securities and other financial assets, net |  |
Number of shares sold | 261,164 | 767,301
Cumulative fair value of the shares sold | $ 1,700 | $ 4,800
Cumulative loss recognized in OCI | $ 602 | $ 151

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- Definition The fair value of securities sold during the period. + References No definition available. + Details
Name: | blx_FairValueOfSecuritiesSold
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The number of shares sold during the period. + References No definition available. + Details
Name: | blx_NumberOfSharesSoldDuringPeriod
Namespace Prefix: | blx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of other comprehensive income, before tax, related to available-for-sale financial assets. [Refer: Financial assets available-for-sale; Other comprehensive income, before tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2017-en-b&anchor=para_91_b&doctype=Standard&forcepdf=true -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2017-en-b&anchor=para_7&doctype=Standard&forcepdf=true -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration