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Cash and stock-based compensation plans (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 First Year [Member]	Dec. 31, 2013 Second Year [Member]	Dec. 31, 2013 Third Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Vesting Percentage	25.00%	20.00%	35.00%	35.00%	30.00%

X

- Definition

Represents the percentage of shares vesting on each grant's date anniversary.

+ References

No definition available.

+ Details

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Namespace Prefix:	blx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration