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Business segment information (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | $ 212,730 us-gaap_InterestIncomeOther | [1] | $ 205,303 us-gaap_InterestIncomeOther | [1] | $ 192,437 us-gaap_InterestIncomeOther | [1]
Interest expense | (71,599)us-gaap_InterestExpense | [1] | (82,211)us-gaap_InterestExpense | [1] | (87,460)us-gaap_InterestExpense | [1]
Net interest income | 141,131 us-gaap_InterestIncomeExpenseNet | [1] | 123,092 us-gaap_InterestIncomeExpenseNet | [1] | 104,977 us-gaap_InterestIncomeExpenseNet | [1]
Long-lived assets: |  |  |  |  |  |
Equipment and leasehold improvements, net | 8,129 us-gaap_PropertyPlantAndEquipmentNet |  | 10,466 us-gaap_PropertyPlantAndEquipmentNet |  | 12,808 us-gaap_PropertyPlantAndEquipmentNet |
Panama [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | 195,575 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = stpr_PA |  | 184,501 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = stpr_PA |  | 173,663 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = stpr_PA |
Interest expense | (70,539)us-gaap_InterestExpense / blx_AllCountriesAxis = stpr_PA |  | (79,132)us-gaap_InterestExpense / blx_AllCountriesAxis = stpr_PA |  | (86,019)us-gaap_InterestExpense / blx_AllCountriesAxis = stpr_PA |
Net interest income | 125,036 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = stpr_PA |  | 105,369 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = stpr_PA |  | 87,644 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = stpr_PA |
Long-lived assets: |  |  |  |  |  |
Equipment and leasehold improvements, net | 7,994 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = stpr_PA |  | 10,237 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = stpr_PA |  | 12,397 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = stpr_PA |
Brazil [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | 0 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = country_BR |  | 33 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = country_BR |  | 155 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = country_BR |
Interest expense | 0 us-gaap_InterestExpense / blx_AllCountriesAxis = country_BR |  | 0 us-gaap_InterestExpense / blx_AllCountriesAxis = country_BR |  | 0 us-gaap_InterestExpense / blx_AllCountriesAxis = country_BR |
Net interest income | 0 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = country_BR |  | 33 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = country_BR |  | 155 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = country_BR |
Long-lived assets: |  |  |  |  |  |
Equipment and leasehold improvements, net | 0 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = country_BR |  | 0 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = country_BR |  | 8 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = country_BR |
United States [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | 17,135 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = country_US |  | 18,501 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = country_US |  | 17,894 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = country_US |
Interest expense | (1,023)us-gaap_InterestExpense / blx_AllCountriesAxis = country_US |  | (1,235)us-gaap_InterestExpense / blx_AllCountriesAxis = country_US |  | (1,332)us-gaap_InterestExpense / blx_AllCountriesAxis = country_US |
Net interest income | 16,112 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = country_US |  | 17,266 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = country_US |  | 16,562 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = country_US |
Long-lived assets: |  |  |  |  |  |
Equipment and leasehold improvements, net | 135 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = country_US |  | 229 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = country_US |  | 403 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = country_US |
Cayman Islands [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Interest income | 20 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = stpr_KY |  | 2,268 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = stpr_KY |  | 725 us-gaap_InterestIncomeOther / blx_AllCountriesAxis = stpr_KY |
Interest expense | (37)us-gaap_InterestExpense / blx_AllCountriesAxis = stpr_KY |  | (1,844)us-gaap_InterestExpense / blx_AllCountriesAxis = stpr_KY |  | (109)us-gaap_InterestExpense / blx_AllCountriesAxis = stpr_KY |
Net interest income | (17)us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = stpr_KY |  | 424 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = stpr_KY |  | 616 us-gaap_InterestIncomeExpenseNet / blx_AllCountriesAxis = stpr_KY |
Long-lived assets: |  |  |  |  |  |
Equipment and leasehold improvements, net | $ 0 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = stpr_KY |  | $ 0 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = stpr_KY |  | $ 0 us-gaap_PropertyPlantAndEquipmentNet / blx_AllCountriesAxis = stpr_KY |
[1] | The numbers set out in these tables have been rounded and accordingly may not total exactly.

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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