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Deposits (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of other assets [Abstract] |  |  |
Aggregate amounts of time deposits of $100,000 or more | $ 2,928,425 | $ 2,802,474 |
Aggregate amounts of deposits in the New York Agency | 266,158 | 250,639 |
Interest expense to deposits in the New York Agency | $ 3,519 | $ 2,094 | $ 1,228

X
- Definition The aggregate amounts of deposits in New York Agency. + References No definition available. + Details
Name: | blx_AggregateAmountsOfDepositsInNewYorkAgency
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | blx_DisclosureOfOtherAssetsAbstract
Namespace Prefix: | blx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of interest expense paid to deposits in the new york agency. + References No definition available. + Details
Name: | blx_InterestExpensePaidToDepositsInNewYorkAgency
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more. + References No definition available. + Details
Name: | blx_TimeDeposits100000OrMoreFromCusstomer
Namespace Prefix: | blx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant