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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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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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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

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Namespace Prefix:	blx_
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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_
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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_
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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 domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Details

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