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Financial instruments (Details 19) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial instruments [Line Items] |  |
Recorded investment | $ 58,759 | $ 65,364
Past due principal balance | 35,000 | 53,364
Related allowance Stage 3 | 27,995 | 35,353
Average principal loan balance | 40,988 | 30,205
Balance Interest recognized | 3,257 | 2,087
Private corporations [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Recorded investment | 23,759 | 30,364
Past due principal balance | 0 | 18,364
Related allowance Stage 3 | 7,468 | 23,174
Average principal loan balance | 5,988 | 12,500
Balance Interest recognized | 229 | 408
Middle-market companies [member] |  |
Disclosure of financial instruments [Line Items] |  |
Recorded investment | 35,000 | 35,000
Past due principal balance | 35,000 | 35,000
Related allowance Stage 3 | 20,527 | 12,179
Average principal loan balance | 35,000 | 17,705
Balance Interest recognized | $ 3,028 | $ 1,679

X
- Definition Amount of impaired financial receivables for which there is a related allowance for credit losses. + References No definition available. + Details
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Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of average investment of impaired financial receivables for which there is a related allowance for credit losses. + References No definition available. + Details
Name: | blx_ImpairedFinancialReceivableWithRelatedAllowanceAverageRecordedInvestment
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income, recognized on accrual basis, on financial receivables, for which there is a related allowance for credit losses and are recognized as impaired. + References No definition available. + Details
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Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment in impaired financial receivables for which there is a related allowance for credit losses. + References No definition available. + Details
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Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Impaired Financial Receivable, with Related Allowance, Unpaid Principal Balance + References No definition available. + Details
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Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
Name: | ifrs-full_MajorCustomersAxis=blx_PrivateCorporationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MajorCustomersAxis=blx_PrivateMiddlemarketCompaniesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |