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Investment securities (Details 4) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 54,180 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment | $ 33,759 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Unrealized Gross Gain | 73 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains | 8 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
Unrealized Gross Loss | 958 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses | 133 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
Fair Value | 53,295 us-gaap_HeldToMaturitySecuritiesFairValue | 33,634 us-gaap_HeldToMaturitySecuritiesFairValue
Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 41,177 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember | 20,752 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gross Gain | 33 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember | 8 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gross Loss | 958 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember | 18 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Fair Value | 40,252 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember | 20,742 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member] | Brazil [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 17,824 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / blx_AllCountriesAxis = country_BR / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember |
Unrealized Gross Gain | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / blx_AllCountriesAxis = country_BR / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember |
Unrealized Gross Loss | 958 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / blx_AllCountriesAxis = country_BR / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember |
Fair Value | 16,866 us-gaap_HeldToMaturitySecuritiesFairValue / blx_AllCountriesAxis = country_BR / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember |
Corporate Debt Securities [Member] | Costa Rica [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost |  | 2,000 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / blx_AllCountriesAxis = country_CR / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gross Gain |  | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / blx_AllCountriesAxis = country_CR / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gross Loss |  | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / blx_AllCountriesAxis = country_CR / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Fair Value |  | 2,000 us-gaap_HeldToMaturitySecuritiesFairValue / blx_AllCountriesAxis = country_CR / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member] | Honduras [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost |  | 4,118 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / blx_AllCountriesAxis = country_HN / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gross Gain |  | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / blx_AllCountriesAxis = country_HN / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gross Loss |  | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / blx_AllCountriesAxis = country_HN / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Fair Value |  | 4,118 us-gaap_HeldToMaturitySecuritiesFairValue / blx_AllCountriesAxis = country_HN / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Corporate Debt Securities [Member] | Panama [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 23,353 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / blx_AllCountriesAxis = stpr_PA / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember | 14,634 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / blx_AllCountriesAxis = stpr_PA / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gross Gain | 33 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / blx_AllCountriesAxis = stpr_PA / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember | 8 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / blx_AllCountriesAxis = stpr_PA / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Unrealized Gross Loss | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / blx_AllCountriesAxis = stpr_PA / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember | 18 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / blx_AllCountriesAxis = stpr_PA / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Fair Value | 23,386 us-gaap_HeldToMaturitySecuritiesFairValue / blx_AllCountriesAxis = stpr_PA / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember | 14,624 us-gaap_HeldToMaturitySecuritiesFairValue / blx_AllCountriesAxis = stpr_PA / us-gaap_StatementGeographicalAxis = us-gaap_CorporateDebtSecuritiesMember
Sovereign Debt [Member] | Colombia [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 13,003 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / blx_AllCountriesAxis = stpr_CO / us-gaap_StatementGeographicalAxis = us-gaap_SovereignDebtMember | 13,007 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / blx_AllCountriesAxis = stpr_CO / us-gaap_StatementGeographicalAxis = us-gaap_SovereignDebtMember
Unrealized Gross Gain | 40 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / blx_AllCountriesAxis = stpr_CO / us-gaap_StatementGeographicalAxis = us-gaap_SovereignDebtMember | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / blx_AllCountriesAxis = stpr_CO / us-gaap_StatementGeographicalAxis = us-gaap_SovereignDebtMember
Unrealized Gross Loss | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / blx_AllCountriesAxis = stpr_CO / us-gaap_StatementGeographicalAxis = us-gaap_SovereignDebtMember | 115 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / blx_AllCountriesAxis = stpr_CO / us-gaap_StatementGeographicalAxis = us-gaap_SovereignDebtMember
Fair Value | $ 13,043 us-gaap_HeldToMaturitySecuritiesFairValue / blx_AllCountriesAxis = stpr_CO / us-gaap_StatementGeographicalAxis = us-gaap_SovereignDebtMember | $ 12,892 us-gaap_HeldToMaturitySecuritiesFairValue / blx_AllCountriesAxis = stpr_CO / us-gaap_StatementGeographicalAxis = us-gaap_SovereignDebtMember

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- Definition Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References No definition available. + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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