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Allowance for credit losses (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Releases Of Specific Reserves | $ 7,931 | $ 1,600 | $ 1,031

X
- Definition Represent the releases of specific reserves during the year, that were accounted for during current and previous year. + References No definition available. + Details
Name: | blx_ReleasesOfSpecificReserves
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration