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Applicable laws and regulations (Details 3) - Financial assets impaired [member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Impaired loans | $ 10,593 | $ 61,845
Normal [Member] |  |
Impaired loans | 0 | 0
Special mention loans |  |
Impaired loans | 0 | 0
Substandards [Member] |  |
Impaired loans | 10,593 | 0
Doubtful [Member] |  |
Impaired loans | 0 | 0
Unrecoverable [Member] |  |
Impaired loans | $ 0 | $ 61,845

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- Definition The amount of non-current loans and receivables. [Refer: Loans and receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_c&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_ImpairmentOfFinancialAssetsAxis=ifrs-full_FinancialAssetsImpairedMember
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_InternalCreditGradesAxis=blx_NormalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_InternalCreditGradesAxis=blx_SpecialMentionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_InternalCreditGradesAxis=blx_SubstandardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_InternalCreditGradesAxis=blx_UnrecoverableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |