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Financial risk - Bank’s sensitivity (Details) - Interest rate, measurement input - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
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 | $ (45) | $ 1,182
Decrease in income | (2,297) | (5,161)
Decrease in equity | 17,232 | 107
Increase in equity | $ 10,772 | $ 16,618

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_
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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
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Namespace Prefix: | blx_
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Balance Type: | credit
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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
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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
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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 members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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Balance Type: |
Period Type: |