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Trading liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Trading liabilities: |  |
Trading liabilities | $ 52 us-gaap_TradingLiabilities | $ 72 us-gaap_TradingLiabilities
Interest Rate Swap [Member] |  |
Trading liabilities: |  |
Trading liabilities | 52 us-gaap_TradingLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember | 65 us-gaap_TradingLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember
Cross Currency Interest Rate Swaps [Member] |  |
Trading liabilities: |  |
Trading liabilities | 0 us-gaap_TradingLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CrossCurrencyInterestRateSwapMember | 7 us-gaap_TradingLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_CrossCurrencyInterestRateSwapMember
Forward Foreign Exchange [Member] |  |
Trading liabilities: |  |
Trading liabilities | $ 0 us-gaap_TradingLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_ForwardForeignExchangeMember | $ 0 us-gaap_TradingLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = blx_ForwardForeignExchangeMember

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- Details
Name: | us-gaap_DerivativeLiabilitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying amount of liabilities as of the balance sheet date that pertain to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include short positions in securities, derivatives and commodities, obligations under repurchase agreements, and securities borrowed arrangements. + References No definition available. + Details
Name: | us-gaap_TradingLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=blx_CrossCurrencyInterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=blx_ForwardForeignExchangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |