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Financial Risk (Details 23) - Interest rate, measurement input [member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Sensitivity to an increase or decrease in market interest rates |  |
Increase in interest rate | 50.00% | 50.00%
Decrease in interest rate | (50.00%) | (50.00%)
Increase in income | $ 1,182 | $ 3,064
Decrease in income | (5,161) | (3,064)
Decrease in equity | 16,618 | 7,461
Increase in equity | $ 107 | $ (7,461)

X
- Definition The increase (decrease) in equity as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations. + References No definition available. + Details
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Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in equity as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations. + References No definition available. + Details
Name: | blx_IncreaseDecreaseInEquityDueToReasonablyPossibleIncreaseInDesignatedRiskComponent
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in profit and loss as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations. + References No definition available. + Details
Name: | blx_IncreaseDecreaseInProfitAndLossDueToReasonablyPossibleDecreaseInDesignatedRiskComponent
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in profit and loss as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations. + References No definition available. + Details
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Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The reasonably possible percentage of the decrease in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations. + References No definition available. + Details
Name: | blx_PercentageOfReasonablyPossibleDecreaseInRiskAssumption
Namespace Prefix: | blx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The reasonably possible percentage of the increase in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations. + References No definition available. + Details
Name: | blx_PercentageOfReasonablyPossibleIncreaseInRiskAssumption
Namespace Prefix: | blx_
Data Type: | num:percentItemType
Balance Type: | na
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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_UnobservableInputsAxis=ifrs-full_InterestRateMeasurementInputMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |